Chapter 4. Citta-vīthi: A taxonomy of mental processes¶

The task of this chapter. The preceding two chapters inventoried mental and material dhammas. One question remains. In what order do these dhammas appear when they actually occur? The system answers through its account of cognitive processes. It divides an act of cognition into positions and specifies which cittas can fill each, how they succeed one another, and what conditions allow the process to finish or cut it short.

This chapter follows two lines of inquiry. The first continues Chapter 2. In exactly which slot is kamma produced? At which step do wholesome and unwholesome kamma diverge? Through which slots does kamma return once produced? The second concerns the taxonomy's use in practice. It gives contemplation a process chart, locating what to contemplate and where intervention is possible. Apart from the overview and these two inquiries, the chapter consists mainly of reference lists. Readers can consult them as needed without reading every list in order.

An overview: what this taxonomy says. There are three points.

First, an act of cognition is not completed in an instant. It follows a fixed sequence of operations. An object strikes a sense door. Consciousness emerges from bhavaṅga, turns toward the object, sees it, receives it, investigates it, and determines it. Then comes the stretch that produces kamma, followed by a little aftertaste. Each step has its position and function. If any step is missing, the act of cognition is incomplete.

Second, consciousness is serial. There is only one citta at a time, with none running in parallel. What we call seeing and hearing at the same time is explained in this system as extremely rapid alternation.

Third, the interval between cognitive processes is not empty. Bhavaṅga consciousness maintains continuity there. Rebirth-linking and death occupy the same line. These three functions are collectively called process-free consciousness, and it is here that one life joins the next. Death consciousness ceases and rebirth-linking consciousness immediately arises, leaving no slot between them. This is Abhidhamma's direct answer to the question of rebirth. A separate section at the end of this chapter addresses it; Chapter 6 continues the discussion.

The fifteen fixed five-door forms are set out below for reference. These three points should already make clear what cognitive-process theory seeks to explain. How does an act of cognition proceed step by step to completion, and at exactly which step is kamma produced?

First, what it is not. A cognitive process is not an ancient version of a neural process. It charts the divisions an act of cognition displays under observation, not the physical transmission of a stimulus. Every slot on the line is a citta, a mental dhamma with an object, associated mental factors, and a particular function. It has neither location nor speed and occupies no space. To read five-door adverting as a signal reaching the thalamus, or receiving as processing in the primary cortex, is to bring precisely the kind of preconception against which the guide to Part II warns.

A mind-moment marks the sequence of arising and ceasing and also expresses relative duration. Saying that matter persists for seventeen mind-moments means that it lasts as long as seventeen cittas arising and ceasing in succession. The treatise and manual used here give no conversion into milliseconds established by independent physical measurement.^{1 2} This is not a system of sequence without duration. The remaining problem is that the sources examined here do not explain why mind-moments of different kinds should have equal duration as relative units of time. The section on absorption and Chapter 6 will return to how this common scale is established and connected to independently measurable time.

Mind-moments and the absence of parallel occurrence. A citta passes through the three submoments of arising, presence, and dissolution. Together they constitute one mind-moment.¹ Cittas succeed one another. The next arises only when the preceding one has ceased, with neither a gap nor an overlap.

This is the foundation of cognitive-process theory. Without parallel occurrence, an act of cognition must form a single line. Without gaps, something must fill the interval between acts of cognition, namely bhavaṅga. A cognitive process is thus defined as a sequence of cittas in a fixed order. "Fixed order" means that the system specifies exactly which slot follows which; succession is not random. This also explains why so much of the chapter must take the form of lists. The fixed forms are limited in number and can simply be set out.

What kinds of cognitive process are there? The table below lists all the categories before we discuss them in turn. Its first eight rows are cognitive processes; the ninth lies outside them.

Keep two points in mind when reading the table. First, the three sense-sphere categories follow the fifteen-form and six-form patterns. The four categories of exalted and supramundane consciousness follow another pattern, passing through preparation, access, conformity, and lineage transition, with no registration in any of them. Second, the last row is not a cognitive process. It fills the intervals between processes and between lives, and has its own section at the end of this chapter.

The five-door cognitive process: seventeen moments. We begin with the complete form. When any of the five doors (eye, ear, nose, tongue, or body) encounters a sufficiently strong object, the fixed form is as follows:

Bhavaṅga → past bhavaṅga → bhavaṅga vibration → bhavaṅga arrest → five-door adverting → sense-consciousness → receiving → investigating → determining → javana × 7 → registration × 2 → bhavaṅga³

From past bhavaṅga to the second registration, there are exactly seventeen mind-moments. The bhavaṅgas at the two ends are the background outside the cognitive process and are not counted.

Consider each slot in turn. Bhavaṅga is the normal state of consciousness outside a cognitive process. Its object is what appeared near the end of the previous life, not the present object. When the object strikes the sense door, bhavaṅga has not yet responded, and one instance passes ineffectually. This is past bhavaṅga. The next stirs once, as bhavaṅga vibration; another cuts off the stream, as bhavaṅga arrest. Five-door adverting turns toward the object, and the cognitive process truly begins. A sense-consciousness arises, seeing or hearing. At this point there is only seeing or hearing, without judgment. Receiving takes over what sense-consciousness has seen; investigating assesses it; determining characterizes it. Seven javanas then run consecutively. In an ordinary wholesome or unwholesome sense-sphere process, this stretch produces kamma; functional javanas do not. The two registrations savor a little aftertaste before the immediate return to bhavaṅga.

This slot-by-slot order is the framework for everything that follows in the chapter.

Why exactly fifteen forms? Objects are not always this strong. Their strength determines the length of a cognitive process, and a process that cannot finish falls back into bhavaṅga midway. The Charts distinguish four grades of object strength, very great, great, slight, and very slight. These correspond to four groups of fixed forms, fifteen in all.³

Very great object: one form. This is the complete seventeen-moment line above, which reaches registration and is therefore called an occurrence ending in registration.

Great object: two forms. All seven javanas run, but there is no registration. The process falls directly back into bhavaṅga at the end, hence an occurrence ending in javana.

Slight object: six forms. The process stops at determining, which arises three times consecutively (only twice in the ninth form). There is no javana at all, hence an occurrence ending in determining.

Very slight object: six forms. Five-door adverting never arises. Bhavaṅga merely vibrates twice and then resumes; the entire cognitive process never gets established. Hence a futile occurrence.

Fifteen is an exhaustive count, not a selection of examples. The numbers of past bhavaṅgas in the fifteen forms run from one to fifteen, no more and no fewer.³ The reason is arithmetic. From striking the sense door to disappearing, an object has only seventeen mind-moments. After past bhavaṅga, at least two slots must still be filled, either by one vibration and one arrest or by two vibrations. Fifteen plus two makes seventeen. Past bhavaṅga can therefore occupy at most fifteen slots. There can be no sixteenth form.

Remember the conclusion of this section. The system has calculated every possibility here, rather than selecting fifteen typical cases to describe. In this respect it is closed. The chapter later asks where that seventeen, on which closure depends, comes from.

Seeing is not yet recognizing. What does one completed five-door process yield? In this system, only the visible object itself, not what we ordinarily mean by seeing a phone. A phone is a concept, and concepts are not objects of the five doors. The five-door process supplies a raw instance of color and then falls back into bhavaṅga. The mind door takes over. Only a series of mind-door processes turns it into a cognition that can be put into words.

The treatise tradition states this explicitly. A mind-door process immediately follows a five-door process, taking the same object again through the mind door. Consciousness then falls back into bhavaṅga, followed by two further processes of the same form. Only then is the object recognized.⁴ Later teaching divides this into three levels. The first mind-door process retakes what was just seen; the second combines it with earlier seeing to obtain a shape; the third supplies a name. A complete diagram of a glance thus requires, roughly, one five-door process and at least three mind-door processes. A single line of seventeen moments is insufficient.⁵

This point deserves emphasis because it is often passed over. Readers can easily mistake a textbook's seventeen-slot diagram for the whole process of seeing. The diagram in fact reaches only as far as the visible object. What we ordinarily call seeing something is always the mind door's finished product. The five doors supply only the raw material. The point has a further use: at the moment of cognition no one is watching the cognition; recognizing and remembering are carried by later processes, so this system needs no self-cognizing aspect simultaneous with cognition, and the mark that perception makes at the time suffices. Chapter 1 of Essay 8 in Part I uses this against Dignāga's regress argument.

An earlier account in the discourses can be set alongside this. The Chinese parallel to the Madhupiṇḍika Sutta says that, dependent on the eye and forms, eye-consciousness arises; the coming together of the three brings contact; dependent on contact there is feeling. What one feels, one perceives; what one perceives, one thinks about; what one thinks about, one reflects on; what one reflects on, one differentiates.⁶ Feeling, perceiving, thinking, reflecting, and differentiating form a line that extends step by step. Its early part still belongs to a sense door; its later part belongs entirely to the mind. Abhidhamma divides this line into five-door and mind-door portions and assigns fixed forms to each. The continuation is clear.

This also explains why the later discussion of contemplation falls entirely on the mind-door side.

Mind-door cognitive processes. There are six forms, divided into four grades according to the clarity of the object. A very clear object has one form, reaching registration; a clear object has one form, ending at javana; an unclear object has two forms, with only mind-door adverting arising twice or three times; a very unclear object has two forms, with only bhavaṅga vibration.³

The mind-door process omits three slots found in the five-door process, those of sense-consciousness, receiving, and investigating. Its object needs neither reception nor assessment. The process passes straight from mind-door adverting to javana. This accounts for both the mind door's efficiency and its susceptibility to trouble. Only one slot separates taking an object from producing kamma.

Mind-door processes are also divided into two types. A consequent mind-door process follows a five-door process and takes the object the five doors just took. The three rounds described in the preceding section belong to this type. An independent mind-door process is not elicited by a five-door process. It takes a mental object directly, such as a memory, concept, meditation sign, or Nibbāna. Thinking, recollecting, reasoning, and practicing insight all belong to this type.²

Kamma is produced only in the javana stretch. We return to the inquiry begun in Chapter 2.

In setting out the eighty-nine cittas, Chapter 2 established the division between kamma and result. Resultant consciousness produces no new kamma; wholesome and unwholesome consciousness perform the work of producing kamma. Cognitive-process theory assigns this division to specific slots. In an ordinary wholesome or unwholesome sense-sphere process, kamma is produced only during javana. Yet not every javana produces kamma: functional cittas and supramundane fruition cittas can also perform javana.²

The numbers match. Fifty-five of the eighty-nine cittas can perform javana: twelve unwholesome, eight great wholesome, eight great functional, one smile-producing, five form-sphere wholesome, five form-sphere functional, four immaterial-sphere wholesome, four immaterial-sphere functional, four path, and four fruition cittas. None of the remaining thirty-four can enter the javana position: ten in the two sets of five sense-consciousnesses, two receiving, three investigating, one five-door adverting, one mind-door adverting, eight great resultant, five form-sphere resultant, and four immaterial-sphere resultant cittas. That makes exactly thirty-four: eighty-nine minus fifty-five.³

The count is immediately visible along the axis of eighty-nine cittas used in Chapter 2. The diagram below uses the same arrangement, dividing the eighty-nine cittas into fifteen groups and four spheres, with one citta per cell. Color marks those that can occupy the javana stretch. Two further diagrams in this chapter use this axis to map the experiencing of kamma's results and the fourteen functions. Together the three diagrams show which duties the same cittas combine in a cognitive process.

This comparison completes an implication only half stated in Chapter 2. Why does an arahant produce no new kamma? Because the arahant's mundane javana position is occupied by functional consciousness, neither wholesome nor unwholesome consciousness. "Functional" means acting without leaving a kammic result. The position, seven moments, and configuration of mental factors are the same; only kammic results are absent. The eight great functional, five form-sphere functional, four immaterial-sphere functional, and smile-producing cittas all belong here. The position is unchanged; the nature has changed.

The fork lies in the determining slot. In which slot does the distinction between producing wholesome and unwholesome kamma emerge?

Determining is the last slot before javana in the fixed form. Its function is to characterize the object, and how it does so decides whether the following seven javanas are wholesome or unwholesome. The treatise locates the decisive factor in attention. Wise attention yields the wholesome; unwise attention yields the unwholesome.^{2 3}

The position of this slot matters. The preceding bhavaṅga, sense-consciousness, receiving, and investigating cittas are resultants of past kamma. Five-door adverting is functional, however, and determining is likewise performed by a rootless functional citta.² The preceding slots therefore cannot all be classed as resultants. The room for choice discussed here concerns determining's effect on the subsequent javanas: in an ordinary wholesome or unwholesome sense-sphere process, once determining has passed and the seven javanas have run their course, kamma has been produced.

The system thus locates the production of kamma in a very narrow space. Only one of the seventeen slots permits effective intervention, and it comes late in the line. This conclusion has two uses. Looking back, it explains why Chapter 2 assigned wholesomeness and unwholesomeness to the configuration of mental factors rather than the object. The object is a kamma-result and is not chosen; the configuration of mental factors belongs to the stretch that produces kamma. Looking ahead, it gives contemplation a point at which to work, since this is the slot practice can train.

One further point follows. The six forms for slight objects stop at determining, without a single javana. There really are, then, acts of cognition that stop at characterization and produce no kamma. These six forms are explicitly listed in the table. They do not describe an ideal state.

The bands show an ordinary wholesome or unwholesome sense-sphere process. Adverting and determining are functional; bhavaṅga, sense-consciousness, receiving, investigating, and registration are resultant; wholesome or unwholesome javanas produce kamma. The fifty-five kinds capable of javana also include functional and supramundane fruition cittas, so they do not all produce kamma.

Seven javanas and three times of maturation. Why are there seven javanas? The treatises give no reason from which the number can be derived. They merely say that there are usually seven, and five near death.⁴ Later doctrine, however, puts the number seven to use in accounting for when kamma matures.

The first javana citta is weakest. If its result matures, it can do so only in this life; this is kamma to be experienced in the present life. The seventh is next weakest and bears fruit in the next life; this is kamma to be experienced in the next life. The middle five can bear fruit in any subsequent life up to entry into Nibbāna; this is kamma to be experienced in later lives. Kamma that fails to mature when it is due is called ineffective kamma.^{4 3}

This allocation connects Chapter 6's table of four kinds of kamma, classified by time of maturation, to cognitive processes. In Chapter 6 they were simply four names. Here they become differences of position among seven javana cittas. In a single act of producing kamma, the first and seventh moments belong to different times of maturation, while the middle five form another category.

The view taken in this book should be stated plainly. The correspondence is suspiciously neat. Why is the first javana weakest and the seventh next weakest? Why are the middle five equal? The treatises give no independently testable reason. It looks more as though the fourfold classification of kamma came first and places were then sought retrospectively for its members among the seven javanas. Chapter 7 will take up this point.

In which slots are kamma's results experienced? Mundane kamma is produced only during javana. Mundane resultants perform the functions listed below. Adverting and determining are functional, so they do not belong among the functions that experience kamma's results.

Within a cognitive process, resultant consciousness occupies four positions: ten sense-consciousnesses (seeing, hearing, smelling, tasting, and touching), two receiving cittas, three investigating cittas, and eleven registration cittas (the three investigating plus the eight great resultant cittas).³ In an act of cognition, what is seen, whether it is desirable or undesirable, and whether there is an aftertaste to savor are all determined by past kamma.

Outside cognitive processes, resultant consciousness occupies the three positions of rebirth-linking, bhavaṅga, and death. These functions belong to no process but join processes and lives together. The same citta performs them and does not change within a single life. This chapter's final section discusses the three functions separately; Chapter 6 supplies the details.

The positions of the thirty-six resultant cittas can also be displayed along the axis of eighty-nine cittas. Thirty-two are mundane resultants and four are supramundane fruition cittas. The latter are not mundane kamma-results that bring about rebirth, but path and fruition can still stand in a kamma-conditioning relation. Fruition immediately follows the path at its initial attainment and can recur later in fruition attainment. The Charts distinguish the immediate kamma condition for the first fruition citta directly after the path from the different-moment kamma condition for the remaining fruition cittas.⁷ Also notice the overlap in the last four rows: one investigating citta accompanied by equanimity occupies five positions, and the eight great resultant cittas occupy two.

The thirty-six in the figure comprise thirty-two mundane resultants and four supramundane fruition cittas. “Not mundane kamma-results that bring about rebirth” does not deny the kamma relation between path and fruition. Immediate succession at initial attainment must be distinguished from later fruition attainment.

Bringing the two locations together makes Chapter 2's distinction clearer on the process diagram. Ordinary wholesome or unwholesome sense-sphere javanas produce kamma. Sense-consciousness, receiving, investigating, registration, and the process-free functions of rebirth-linking, bhavaṅga, and death experience mundane kamma-results. Adverting and determining are functional. Kamma production, its results, and functional activity can occur on the same line; the slots outside javana cannot all be colored as experiencing kamma's results.

This completes the chapter's first inquiry. Producing kamma, its wholesome or unwholesome character, and experiencing its results all belong to specific cittas and functions. One fixed form connects them without merging their different statuses.

The positions of the fourteen functions in cognitive processes. Chapter 2 listed the fourteen functions without explaining them, leaving their details to this chapter. They are rebirth-linking, bhavaṅga, adverting, seeing, hearing, smelling, tasting, touching, receiving, investigating, determining, javana, registration, and death. We can now locate them. Eleven occur within processes. These are adverting (five-door and mind-door), the five functions of seeing, hearing, smelling, tasting, and touching (performed by the two sets of five sense-consciousnesses), receiving, investigating, determining, javana, and registration. Rebirth-linking, bhavaṅga, and death lie outside processes.

Functions and cittas do not correspond one to one. One citta can perform several functions. Investigating consciousness accompanied by equanimity performs five, serving as investigating, registration, rebirth-linking, bhavaṅga, and death. Many cittas can also perform one function, as the fifty-five that can occupy the javana position do. This gives concrete form to Chapter 2's distinction. The eighty-nine cittas form an inventory by nature, the fourteen functions an inventory by role; the two inventories are used together.

Displayed on the same horizontal axis, all fourteen functions fit into eight rows. Rebirth-linking, bhavaṅga, and death involve the same nineteen cittas; seeing, hearing, smelling, tasting, and touching involve the same ten. Each set is therefore combined into one row.

Pause over one feature of the diagram. Only the javana row is broad; all the others are narrow. In the whole cognitive process, this is the only stretch that offers real room for choice.

Absorption processes. The processes discussed so far belong to the sense sphere. Entering jhāna through concentration practice follows a different pattern.

After mind-door adverting, the fixed form runs through preparation, access, conformity, lineage transition, and absorption. Preparation makes ready; access draws near; conformity is a transition that accords with what precedes and follows; lineage transition turns from sense-sphere to exalted consciousness; absorption is jhāna consciousness itself. Those with sharp faculties omit preparation, passing through only access, conformity, lineage transition, and absorption. Those with dull faculties add preparation before these four slots, making five.^{3 8}

Chapter 4 of the Visuddhimagga restricts absorption to the fourth or fifth javana. Beyond that point, the process is too close to bhavaṅga and lacks the power to turn into absorption. The treatise likens it to someone running toward a precipice who tries to stop at the edge but falls straight down. Bhavaṅga is where the runner falls.⁸

This section is for reference, with just two main points. Entering jhāna requires a transition through four or five slots; there is no direct leap. Whether the faculties are sharp or dull determines the number of slots.

How is absorption interrupted? This section asks the chapter's hardest question.

On first entering jhāna, absorption javana arises for only one moment before falling back into bhavaṅga.^{8 4} In a process of direct knowledge, too, absorption occurs only once. With proficiency, one can remain for a long time. The teaching tradition says one can stay for a predetermined duration, even seven days.³ Here is the difficulty. The same stretch of absorption can last one moment or seven days. What brings it to an end?

Consider what the system has available to answer this. Every citta in the absorption stretch has the same object, nature, and associated mental factors. There is no discernible difference between successive cittas, so the table has no way to mark the last. A table of fixed forms can set out order, but not length. It can write "javana × 7" because seven is fixed. For "continuity of absorption," there is no number. Of the twenty-four conditions, only decisive support comes close to being relevant, but this concerns the strength of a force, not the length of a duration.

The traditional answer invokes the five masteries, those of adverting, entering, resolution, emerging, and reviewing.^{8 2} Mastery of resolution deals precisely with this issue. One decides before entering how long to remain, and can then emerge when the time comes. Mastery of emerging is the ability to emerge at the appointed time.

The answer remains vague in two respects. First, deciding in advance is the work of the mental factor called decision. The system does not explain how it remains effective across thousands upon thousands of subsequent mind-moments with identical contents. If the answer is the residual force of decisive support, why does that force run out at exactly the predetermined point? There is still no answer. Second, both the treatises and the teaching tradition acknowledge emergence through external interruption, such as a knock at the door, bodily discomfort, or the arrival of an agreed time. If external conditions can interrupt absorption, resolution does not wholly determine its duration. If they cannot, the claim of prolonged absorption conflicts with actual experience. Both difficulties remain.

This book sees a limit of the notation of fixed forms here. Cognitive-process theory can order a sequence and specify relative durations, but those specifications do not by themselves explain how many moments a particular absorption lasts or why it ends at the predetermined time. Seven javanas, two registrations, and one or three occurrences of determining are fixed counts that can be written directly into a sense-sphere process. Absorption has no fixed duration. Providing a relative unit of time does not yet explain the endpoint of that stretch. Chapter 7 will discuss this point.

The footer leaves the question for Chapter 7, "Restraint and Vacancies": a relative scale does not by itself explain how long an absorption lasts, and the sources used here still do not explain why different kinds of mind-moment have equal duration.

Path and fruition processes. The supramundane process follows the same form as absorption. Mind-door adverting is followed by preparation, access, conformity, and lineage transition, then one moment of path consciousness, two or three fruition cittas, and a return to bhavaṅga. Those with sharp faculties omit preparation and have three fruition cittas. Those with dull faculties include preparation and have two. Here lineage transition is renamed change of lineage, since this turn crosses from the lineage of an ordinary person to that of a noble one.^{3 2}

Path consciousness arises for a single moment, only once in a lifetime for each of the four paths. This is the system's strictest stipulation. Two points need to be explained.

Two points need to be explained.

The first shows restraint. The system puts liberation in the sequence, in the javana position. It follows the same transition as jhāna and uses the same names, preparation, access, conformity, and lineage transition. The system devises no separate mechanism, neither raising liberation above the sequence nor passing over it as ineffable. This is a restrained approach. Making no exception at its highest point shows both confidence in the notation and willingness to submit that point to examination under the same rules. This will be one of the main pieces of evidence when Chapter 7 assesses the system's restraint.

The second concerns the present absence of empirical evidence. Path consciousness lasts one moment and, by definition, cannot be repeated. Only the person undergoing it knows that it occurs, and only by looking back afterward. The system provides a reviewing slot for the path, fruition, Nibbāna, defilements abandoned, and defilements not yet abandoned, making five kinds of review.³ But reviewing remains on the experiencer's side. Repeated disputes since the twentieth century over how to identify the attainment of fruition demonstrate precisely this point. Outside the system, no independent criterion can be found.

Together these two points create an embarrassment for this chapter. The most restrained stretch is the least open to testing. This book does not infer that it was constructed, since that claim would also lack grounds. It records only that the system here writes its highest claim as one slot in a sequence, and that this is the sole slot in the table that a third party cannot identify. Chapter 7 will consider both aspects.

Direct-knowledge processes and the law of registration. The following two passages are for reference.

Direct-knowledge processes. Based on the fifth jhāna, the fixed form consists of preparation, access, conformity, and lineage transition, followed by one direct-knowledge citta and an immediate return to bhavaṅga. The direct-knowledge citta is wholesome or functional consciousness of the fifth jhāna; its object is what one wishes to manifest.³

The law of registration. Registration occurs only in sense-sphere processes with very great or very clear objects, never after exalted or supramundane consciousness. Eleven cittas can perform it, the three investigating and eight great resultant cittas. Which performs it on a given occasion depends on the object's nature and the type of person producing kamma. Chapter 4 of the Charts provides a separate table.³

Where does seventeen come from? Chapter 3 ended with the number seventeen, the lifespan of material dhammas in mind-moments. This chapter has supplied its other end. A complete five-door process from past bhavaṅga to the second registration spans exactly seventeen mind-moments.

The two seventeens are the same, but they define one another. Why do material dhammas persist for seventeen mind-moments? Because a complete cognitive process has seventeen slots. Why does a complete process have seventeen slots? Because its object can persist for only seventeen mind-moments, and the process must finish before the object ceases. That second premise is exactly what this chapter used to show that the fifteen forms are exhaustive. Fifteen plus two equals seventeen, so there can be no more than fifteen forms. The inference itself is valid, but the premise comes from the other end.

Where is the way out? This chapter leaves the answer to Chapter 7.

Process-free consciousness: no empty slot between lives. So far we have stayed within cognitive processes. Outside them lie rebirth-linking, bhavaṅga, and death. Since these three functions belong to no process, they are called process-free consciousness. The section on experiencing kamma's results gave their numbers. We now consider why they matter.

Essay 13's account of rebirth, the six destinies, and the three realms established that rebirth and saṃsāra cannot be bypassed in the early teaching. They are not a shell that can be peeled away. What remains after their removal is no longer the same teaching. Any doctrinal system that claims completeness must therefore give them a place in its own notation. Here is the place Abhidhamma provides.

Within one life, the same citta performs rebirth-linking, bhavaṅga, and death, taking the same object. That object comes from the kamma, sign of kamma, or sign of destiny that appeared in the preceding life's process near death. Nineteen cittas can perform these functions, comprising two investigating cittas accompanied by equanimity, eight great resultant, five form-sphere resultant, and four immaterial-sphere resultant cittas.³ The process near death has five javanas, not seven, followed by two registrations and then death consciousness. As death consciousness ceases, rebirth-linking consciousness immediately arises, without a single mind-moment between them.²

Immediacy is the key to this answer. Theravāda Abhidhamma leaves no room here for intermediate existence. Book VIII of the Kathāvatthu devotes a section to refuting it.⁹ Sarvāstivāda and most later schools posit an intermediate existence between death and rebirth; Theravāda categorically does not. The lives join at two immediately adjacent mind-moments, one belonging to this life, the other to the next.

Declining to posit intermediate existence is not just a convenience. What would exist during such an interval? It would have no body or sense doors. If it had a continuity of consciousness, how that continuity was maintained would need explaining, and any maintainer could easily be read as a self that crosses over. The purpose of removing this vacancy is precisely to leave no place for a self. The answer is uncompromising, and its cost is concrete.

This book records that immediacy presupposes a shared clock.

Consider what immediacy says. A person dies in this realm, and rebirth-linking consciousness arises together with a mass of kamma-produced matter in a womb elsewhere, or in another realm altogether. Saying that no mind-moment separates the events means that this moment here and that moment there share the same present. Yet although mind-moments express relative duration, the sources used here have not explained how different continuities share and calibrate that scale. If we count slots separately on two lines, what warrants aligning this slot with that one? To make the claim intelligible, we must assume that the continuities share synchronized subjective time, a global clock. The sources used here do not explain how this assumption is established. How immediacy retains the same scale across two locations still needs an account.

The same assumption has already been used. The preceding section's claim that material dhammas last seventeen mind-moments measures matter in the shared world by counting slots in one mental continuity. Matter is seen in common; each mental continuity is individual. Aligning them also requires a shared clock. The same gap thus appears twice, between consciousness and matter, and between this life and the next.

Chapter 7 will discuss this point. Chapter 6 takes up the details of rebirth-linking, the thirty-one planes in four spheres, three kinds of object near death, types of rebirth-linking, and lifespans. Here we simply mark the problem. How does a notation that expresses relative duration in mind-moments ensure that different locations share the same scale at the junction between lives?

Continuity is unbroken, yet nothing crosses over. This is Abhidhamma's most strenuous and most important statement on rebirth. The strain lies in continuity, not in the not-self half, which it explains very clearly. What warrants saying that two continuities fit together exactly, with no gap?

The question of a shared scale in the figure does not mean that mind-moments lack duration. The sources used here still do not explain how different continuities calibrate the same scale, or why different kinds of mind-moment have equal duration.

Cognitive processes and contemplation. We turn to the chapter's second inquiry. By the end of this section, we will also address the question left at the end of Chapter 3.

Is this taxonomy a record of findings from contemplation, or a manual for contemplating? Both readings have advocates in the tradition. This book takes it to be both, with the second use more concrete, because it gives contemplation three things.

First, it gives contemplation a location. Insight can occur only through the mind door. A five-door process has no slot for contemplation. Sense-consciousness, receiving, and investigating are resultant. Determining and javana are present consciousness but are occupied with the present object. As explained above, a complete act of cognition comprises a five-door process and several mind-door processes. Insight works in the latter. Knowledge distinguishing mentality and materiality divides present experience into its mental and material sides; knowledge discerning conditions asks about the conditions of each. Both belong to the mind door.³

Second, it gives contemplation a point of application. The determining slot, one step before javana, is the only room in the process for intervention. That is why mindfulness must be trained to be immediate and preconceptual. When needed, it has only this slot and a very brief window. A slot too late, and the seven javanas have run their course and produced kamma. Guarding the sense doors has a precise meaning on this diagram, bringing determining under wise attention. Whether to look or not, or to listen or not, is secondary.

Third, it gives a sequence. Chapter 9 of the Charts covers the forty meditation subjects, seven purifications, and sixteen insight knowledges; they are not reproduced here.³ We need only state their relation to this chapter. The meditation subjects specify what to contemplate; the seven purifications specify the order of advance; the sixteen insight knowledges provide successive markers for assessing that advance. Combined with the taxonomy of cognitive processes, they form a complete working chart.

One further dispute needs to be recorded. Can the details of cognitive processes actually be observed? Modern Theravāda texts give two accounts. Nyanaponika Thera says a single mind-moment is so subtle as to be almost imperceptible in practice; experience can grasp only a "serial present" made up of several moments. Pa-Auk meditation instruction requires practitioners to discern the number and types of moments of consciousness in each process, breaking down the compactness of mentality.¹⁰ These sources establish a difference in teaching claims. They do not establish a dispute between two clearly bounded institutional "traditions." This book does not adjudicate the dispute, but locates it at the question already raised. Is a cognitive process a record of observation or a guide to it? The dispute arises because the taxonomy is used as both.

The dispute also brings the preceding chapter's question into this one. Which stretches of the table of fixed forms were found in contemplation, and which were added to make the notation consistent with itself?

Several points call for consideration. The exhaustiveness of the fifteen forms is calculated, not observed. The clean, decisive inference shows its numerical origin. First fix matter's lifespan at seventeen, then work backward to a maximum of fifteen past bhavaṅgas. The assignment of three times of maturation to seven javanas likewise suggests, as noted above, that the fourfold classification of kamma came first and its positions were assigned afterward. The treatises give insufficient reasons for restricting registration to the sense sphere and the strongest objects. This book sees the restriction as a way of drawing a boundary, so that the registration slot need not be filled everywhere.

Other points do not look like such additions. The five-door and mind-door division aligns with the sequence in the Chinese parallel to the Madhupiṇḍika Sutta and with everyday experience. Seeing and recognizing really are different things. The dependence of process length on object strength also agrees with experience, in which a very weak stimulus leaves only a disturbance that never takes shape. The position of determining and the practical essentials of mindfulness corroborate each other.

The criterion for distinguishing these groups is the same as in Chapter 3. Can they be separately identified in contemplation? The conclusion is left to Chapter 7.

Passing the discussion to Chapter 5. Cognitive processes arrange cittas in order but do not explain what establishes their succession. Why does adverting follow bhavaṅga, and why must receiving follow sense-consciousness? Where do these orders come from? The table of fixed forms records the outcome, while its reasons lie outside the table. Explaining them is the work of conditions. The next chapter takes up the twenty-four conditions.

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