Book summary “Indian psychology”: summary

Introduction

You often study the mind through Western paradigms that rely on empirical brain science and laboratory experiments. This leaves you without a systematic view of non-Western cognitive frameworks that map consciousness, perception, and inner instruments through rigorous introspection. You need an exhaustive account of how classical Indian philosophy treats psychology as an integral part of metaphysics and logic.

Jadunath Sinha bridges this gap by presenting a comprehensive survey of Indian psychology based on original Sanskrit texts across diverse philosophical schools. Indian psychology synthesizes psychological, logical, and epistemological problems within metaphysical frameworks, anchoring perceptual and conscious phenomena in introspection and internal instruments rather than empirical experimentation.

The book traces perception from physical substrates and sense-organs to determinate stages, cognitive functions, and illusions. You will explore how classical thinkers analyze space, time, universals, self-luminous consciousness, and super-normal yogic intuition.

• How do internal mental organs coordinate with external senses to produce determinate cognition?
• What mechanisms explain perceptual illusions, memory lapses, and dream states?
• How does yogic meditation unlock super-normal intuition and divine omniscience?

1. The Physical Basis of Perception

In Indian philosophical literature, psychological, logical, ethical, and epistemological problems are never treated as separate compartmental sciences, but are synthesized within metaphysical frameworks. Indian psychology is entirely grounded in metaphysics rather than empirical experimentation, making metaphysical foundations necessary to understand psychological phenomena like the self or universals. Jadunath Sinha's comprehensive constructive survey of Indian psychology is designed to span two volumes, with the first volume dedicated entirely to the psychology of perception.

Indian systems analyze the physical basis of perception by tracing the nervous system, internal manas, and sense-organs evolving from material elements or cosmic egoism.

Nervous System Conceptions

Ancient Indian medical and philosophical texts developed distinct concepts regarding the seat of consciousness and the nervous system. Caraka and Suśruta originally regarded the heart as the seat of consciousness and identified sensory and motor nerves. Later Tantric writers shifted the seat of consciousness to the brain and distinguished specific sensory nerves for smell, sight, hearing, taste, and touch.

These pathways carry specific sensations through designated channels:

• manovahā nāḍī
• ājñāvahā nāḍī
• gandhavahā nāḍī
• rūpavahā nāḍī
• śabdavahā nāḍī
• rasavahā nāḍī
• sparśavahā nāḍī

The Nature of the Sense-organs

Buddhism classifies consciousness into six varieties and views the external sense-organs as material end-organs made of translucent subtle matter. Jainism divides sense-organs into objective physical senses and subjective psychical faculties of the soul.

Physical senses consist of the dravyendriya and its protecting environment. Subjective senses include labdhi and upayoga.

Sense-Organ Modifications

The Sāṁkhya school posits eleven sense-organs evolving from egoism, divided into cognitive organs, motor organs, and the internal mind. Buddhi holds the primary position because it directly brings about the experience of the self and stores all subconscious impressions.

Sāṁkhya and Vedānta maintain that sense-organs apprehend distant objects by extending outward through functional modifications. The Nyāya-Vaiśeṣika school establishes the existence of five distinct material sense-organs based on separate functions, sites, processes, magnitudes, and atomic origins. Buddhists argue that the visual organ is merely the static eyeball and cannot travel to distant objects, whereas Nyāya-Vaiśeṣika asserts that visual light rays shoot outward.

2. Indeterminate and Determinate Perception

Indian thinkers generally divide perception into two stages: indeterminate perception, which is an immediate, non-relational apprehension of an object's form without verbal images, and determinate perception, which is a relational, articulate cognition involving analysis, synthesis, and verbal names.

Perception unfolds in distinct stages from non-relational indeterminate apprehension to relational, articulate determinate cognition across diverse philosophical schools.

Indeterminate perception is purely sensory, presentative, dumb, and abstract, aligning with William James's concept of knowledge of acquaintance. Determinate perception is presentative-representative, vocal, concrete, and aligns with knowledge-about.

Indeterminate Stages

According to Samkara, indeterminate perception apprehends absolutely nothing except the pure, undifferenced Being identical with universal consciousness. Samkara argues that indeterminate perception cannot apprehend individual objects or properties because apprehending qualifications presupposes the apprehension of difference, which requires non-existence apprehended through non-perception. Buddhists maintain that perception is always indeterminate, apprehending only the specific individuality of an object devoid of general characteristics and names. Mimaṃsaka philosophers like Kumarila and Prabhakara argue that indeterminate perception apprehends an individual object along with its generic and specific characters without distinguishing them.

Determinate Analysis

The Samkhya school distinguishes between external senses performing indeterminate perception and the central sensory organ, manas, performing determinate perception. Vacaspatimisra holds that external senses give an unconnected mass of presentations, while manas converts them into concrete objects through assimilation and discrimination. Vijnanabhiksu alternatively argues that external senses handle both stages directly. The Nyaya-Vaiśeṣika tradition views indeterminate perception as a nameless, non-relational apprehension of an object and its properties immediately following sense-organ contact. Ramanuja and Venkatanatha challenge non-relational theories by asserting that indeterminate perception is actually relational, apprehending the first individual of a class with a specific configuration.

Proof of Perception Stages

Minor schools like Madhva, Vallabha, and the Sabdikas deny the existence of indeterminate perception altogether, arguing that all knowledge is inherently determinate and interpenetrated by language. To avoid infinite regress and account for how determinate perception recognizes class characters, Naiyāyikas and Mimaṃsakas insist that indeterminate perception must be accepted as an invariable antecedent. Janakinatha argues that a qualified cognition presupposes a prior cognition of qualifications. Against Buddhist objections, thinkers like Sridhara and Parthasarathimisra maintain that determinate perception is genuinely perceptual because it is produced by peripheral stimulation.

3. Objects and Conditions of Perception

The Nyāya-Vaiśeṣika system divides perception into external perception via five senses and internal perception via the mind. External perception relies on the five sense organs for qualities like odour, taste, sound, colour, and touch, along with their generalities and negations.

External and internal perceptions depend on specific material magnitudes, manifest qualities, ordinary intercourse, and extraordinary alaukika sannikarṣa.

Internal perception through the mind grasps pleasure, pain, desire, aversion, cognition, volition, and the self. The heat of summer is infra-visible because it lacks appreciable colour, but it is perceived through touch because it possesses appreciable touch.

Conditions of External Perception

External perception requires that an object possesses appreciable magnitude, is a composite of multiple parts, and has manifest qualities like colour or touch. Older Vaiśeṣikas hold that external perception requires an object to have extensive magnitude, be composed of many parts like a mote rather than an indivisible atom, and possess manifested colour. Later Vaiśeṣikas argue that manifest touch is the condition for tactual perception, and manifest colour for visual perception. Air has many parts and magnitude, but it cannot be seen through the visual organ because it lacks the impression of colour.

Ordinary and Extraordinary Intercourse

The earlier Nyāya-Vaiśeṣika recognizes six kinds of ordinary intercourse (laukika sannikarṣa) between sense organs and their objects to explain normal perception.

• Union
• United-inherence
• United-inherent-inherence
• Inherence
• Inherent-inherence
• The relation of qualification and the qualified

In the visual perception of a jar, there is a union of the visual organ with the jar. Neo-Naiyāyikas recognize three kinds of extraordinary intercourse (alaukika sannikarṣa) to account for super-sensuous and universal perceptions. When seeing a single case of smoke, the generic character of smoke brings about the perception of smoke of all times and places.

Acquired Perception

The Jaina and the Śaṁkara-Vedāntist view acquired perception as a complex psychosis or mechanical mixture of presentative and representative elements. The visual perception of fragrant sandalwood is treated as a mechanical mixture of an optic sensation plus an image of fragrance. The Nyāya-Vaiśeṣika rejects psychic compounds, arguing instead that an acquired perception is a single integral pulse of consciousness preceded by recollection.

After eating ninety-nine fruits, recognizing the hundredth fruit is qualified by the previous perception of the ninety-nine past fruits.

4. Recognition and Perception Theories

Philosophical schools explain recognition and perception through unique psychological compounds, mental chemistry, and structured perceptual definitions.

Indian philosophical schools offer profoundly different psychological explanations of recognition. The Buddhist holds that recognition is a mechanical combination of two discrete psychoses. The Nyāya-Vaiśeṣika, Mīmāṁsaka, and Vedāntist hold that recognition is a single psychosis of the nature of a qualified perception produced by peripheral stimulation and subconscious impressions. The Jaina maintains that recognition is a unique, sui generis chemical compound-like psychosis that is neither pure perception nor pure recollection.

When you eat a number of fruits, say, one hundred, and after eating ninety-nine fruits come to the hundredth fruit, you have the consciousness of having eaten ninety-nine fruits. The current cognition is qualified by the past recollection of the preceding ninety-nine.

Theories of Perception

Buddhist psychology defines perception as a direct, non-erroneous cognition completely free from mental concepts, names, and memory constructs. Diṅnāga and Dharmakīrti argue that valid perception must be bare, inarticulate, and nameless.

The Jaina school breaks down ordinary empirical perception into four distinct psychological stages:

• Avagraha: the initial perception of some features and general existence of an object
• Īhā: the desire to know the particulars and whether the object is this or that
• Avāya: the definite ascertainment and true determination of the object's real nature
• Dhāraṇā: the retention of the definite perception resulting in a lasting impression

When observing the upward and downward movement of birds and the fluttering of their wings, you transition from vague sight to definitely knowing there is a row of herons rather than a flag.

5. Psychic Functions and Mental Operations

Sāṁkhya and Vedānta describe perception through out-going vṛttis, internal organ coordination, and the transcendental reflection of the puruṣa.

According to the Sāṁkhya school, perception is defined as a cognition that takes the form of an object through a related psychic function. The buddhivrtti goes out like the flame of a lamp through the sense-organs to the external object, becoming modified by the object's particular form. Kapila and Isvarakrsna define perception as a determinate cognition of an object produced by its proximity to the sense-organ.

Psychic Functions

Perception in Samkhya involves the coordinated functioning of three internal instruments: manas, ahamkara, and buddhi. Vacaspatimisra illustrates this via an analogy where external senses gather immediate impressions, the mind reflects and discriminates them, the empirical ego appropriates them, and the intellect makes a decisive judgment and resolution to act.

You follow these precise steps during this internal sequence:

• First intuit the object
• Reflect upon it
• Appropriate it to oneself
• Resolve what is to be done
• Proceed to act

A person in dim light first apprehends an undifferentiated unit, reflects and determines it to be a terrible thief with a bow and arrow, thinks of it in reference to himself, and resolves to fly from the place.

Purusha and Internal Organs

Perception depends on the metaphysical interaction between the conscious purusa and the unconscious buddhi through mutual reflection. The inactive loadstone attracts a piece of iron by its own power, just as inactive objects attract the active mind.

According to the Vedanta theory, the translucent internal organ streams out through the sense-organs to reach the external object and take its form. In the perception of a jar, the mental mode goes out to the jar and occupies the same position in space with it.

6. Perception of Space, Movement, and Time

Space, movement, and time are analyzed as intellectual constructions, auditory qualifying adjuncts, or lived coefficients of consciousness rather than empty absolutes.

Space and Movement

According to the Sāṁkhya-Pātandjala and Advaita Vedānta traditions, space and time are not objective realities in themselves. The intellect imposes empirical relations of space, time, and causality onto the underlying reals of sattva, rajas, and tamas. True intellectual intuition allows you to apprehend reals without these imported categories.

The Mīmāṁsā school maintains that direction and distance are directly perceived through the auditory organ as qualifying adjuncts of sounds. The ear-drum comes into contact with sounds propagated through air-waves.

Sounds coming from a proximate point are perceived as most intense, while their intensity diminishes as they come from greater distances.

The Mīmāṁsā school explains the extra-organic localization of sounds as an error of judgment or an illusory projection.

Mistaking an audible sound as originating from an external point in space rather than the ear-drum itself, just as silver is erroneously perceived in a shell due to memory and similarity.

Perception of Time

Indian philosophy views time not as an independent entity perceivable in isolation, but as a coefficient of all consciousness and a qualification of perceived changes. There is no sense organ for empty time. Succession and duration are constituents derived from actual events and actions.

Vātsyāyana argues that time is perceived through actions, distinguishing past, present, and future based on whether an action is over, not yet begun, or going on.

A falling fruit is perceived as present when it is in the process of falling, as past when the action has ceased, and as future when it is not yet begun.

The Buddhists reject the specious present and duration, asserting that time consists solely of succession and that the sensible present is purely instantaneous or momentary. Impressions are discrete, non-during, and momentary.

The Naiyāyikas and Vedāntists maintain that the sensible present possesses a duration and is not merely an instantaneous mathematical point.

7. The Problem of the Universal

Indian philosophy approaches the problem of the universal and the individual through synthetic unities of psychological and metaphysical standpoints. You can categorize these diverse solutions into nominalism, conceptualism, and realism.

The debate over universals encompasses Buddhist nominalism, Jaina modified nominalism, conceptualism, and Nyāya-Vaiśeṣika realism.

Nominalism and Conceptualism

Buddhists are uncompromising nominalists. They argue that specific individuals alone are real and apprehended by indeterminate perception. Universals remain unreal conceptual constructions. An eternal class-essence cannot be perceived. Perception only captures momentary specific individuals devoid of common class features.

Jaina philosophy advocates modified nominalism. It denies an eternal class-essence while affirming real similarity or likeness among individuals as the objective ground for universal notions. Rāmānuja similarly argues that individuals alone are real. They possess fundamental likeness in the shape of particular configurations rather than an abstract class-essence.

Kaṇāda defines universality and perception marks as relative to the understanding. He advocates a modified form of conceptualism with a tinge of realism. Universality operates as a mark used by the mind to assimilate objects into a class. Particularity operates as a mark to differentiate them. Common qualities still exist in individual objects.

Realism and Identity-in-Difference

The later Nyāya-Vaiśeṣika and Mīmāṁsaka schools maintain that eternal and ubiquitous universals exist in individual objects of nature. They are directly apprehended by perception. Naiyāyikas argue that the universal relates to the individual through inherence. It serves as an immutable formative principle immanent in perishable individual objects.

The Bhāṭṭa Mīmāṁsaka establishes the doctrine of identity-in-difference. The universal is both different from and identical with the individual. Perception involves inclusion and exclusion simultaneously. This proves the object possesses a dual character where universality and particularity coexist without contradiction in a single cognition.

Śaṁkara recognizes Brahman as the ultimate universal Being. He accepts empirical universals in the phenomenal world as archetypal forms or evolutes of nescience. Phenomenal universals serve as models molded by God for sensible objects.

8. Perception of Cognition and the Self

Schools diverge on whether cognition and the self are inferred through cognizedness, revealed via self-luminous tripuṭī, or known as pure transcendent consciousness.

Perception of Cognition

The Bhāṭṭa Mīmāṁsaka argues that an act of knowledge produces a specific result or property in the object called cognizedness or manifestness. Just as cooking produces cookedness in rice, the act of cognition produces cognizedness in its object, allowing you to infer the existence of the prior cognition. When a person knows a jar, an apprehension arises that the jar is cognized, and from this cognizedness of the jar, the existence of the cognition is inferred.

Śrīdhara and Udayana argue that cognizedness itself cannot be apprehended without already knowing the relation and the cognition, leading to a fallacy of hysteron proteron. We have recollection of past objects and expectation of future objects, yet present recollections cannot produce cognizedness in non-existent past or future objects.

Prabhācandra criticizes both the Bhāṭṭa and Nyāya-Vaiśeṣika views, pointing out that an unperceived cognition could never manifest an object. Just as a lamp illumines both itself and other objects around it, human cognition reveals itself and the object simultaneously.

Perception of the Self

The Cārvāka school denies the existence of an independent self and views consciousness merely as a material by-product. Jayanta Bhaṭṭa notes the Cārvāka comparison of consciousness arising from unconscious elements to intoxicating liquor produced from unintoxicating rice and molasses.

The Upaniṣads describe the Ātman as the ultimate, unconditioned reality that transcends all categories and cannot be known as an object. You can realize this truth through specific internal disciplines:

• Withdraw the senses from external objects and concentrate the mind on the inner self.
• Realize the Ātman through meditation using the pure, enlightened heart and spiritual vision.

9. Indefinite Perceptions, Illusions, and Dreams

Prasastapada divides all knowledge into true knowledge and erroneous knowledge, subdividing each into four categories. True knowledge includes perception, inference, recollection, and the higher intuition of an ascetic. Erroneous knowledge includes doubt, error, indefinite and indeterminate perception due to lapse of memory, and dreams.

Indefinite perceptions and illusions arise from physiological humours, memory lapses, and structural anomalies, generating multiple epistemological theories.

Indefinite Perceptions

Doubtful perception is a complex presentative-representative process where the mind oscillates between two alternatives because of perceiving a common quality. Perceiving a tall object from a distance and wondering, Is it a post or a man?

Doubt is psychologically characterized by an unpleasant feeling tone, the arrest of active behavior, and the presence of contrary qualities apprehended in the same object. Jayanta Bhatta notes that it halts all action, while later logicians define it using four alternatives (catuskotika): This is a post, This is not a post, This is a man, This is not a man.

Conjecture or uha is an indefinite perception where only one alternative is manifest to consciousness while the other is suppressed by stronger associative connections. Perceiving a tall object in a cornfield where posts are rare and men are common, leading to the indefinite perception that it may be a tall man.

Anadhyavasaya is an indefinite and indeterminate perception due to absent-mindedness, ignorance, or lapse of memory, where alternatives remain unmanifested. A Bāhīka inhabitant from the Dakṣa country seeing a jack-fruit tree for the first time recognizes it as an existing substance and a tree, but lacks the specific name. This involves six definite perceptions of a jack-fruit tree by a stranger: this exists, this is a substance, this is a modification of earth, this is a tree, this has a colour, this has branches.

Illusions and Theories

Śaṁkara Miśra divides illusions into those where an actually perceived object is falsely ascribed to another present object, and those where an object revived in memory is falsely ascribed to a present object. The illusory perceptions of bitter molasses and yellow conch-shell illustrate the first kind, while the illusory perception of silver in a nacre illustrates the second kind.

Jayanta Bhaṭṭa distinguishes between peripherally produced illusions and centrally produced hallucinations, noting that illusions always have objective substrates while hallucinations are entirely mental. A lover overwhelmed by passion who perceives the semblance of his distant beloved near him experiences a hallucination.

Indian philosophers enumerate multiple conditions and defects that generate illusions, ranging from external stimuli and media disorders to bodily humours and mental states. When sailing in a boat, the boat and passengers move, but surrounding trees appear to be moving, creating a parallax illusion.

Prabhācandra and Jayasiṁhasūri catalogued seven different theories of illusions and eight different theories of illusions respectively, integrating psychological analysis with epistemological significance.

Dreams and Sense Disorders

Most ancient Naiyayikas and Vaisheshikas advocate the presentative theory of dreams, viewing them as direct internal perceptions through the mind when external sense organs cease to operate. Udayana notes that while external senses generally cease, the tactual organ pervading the organism remains partially active, and external stimuli can trigger peripherally excited dream-illusions.

Indian thinkers categorize dreams into multiple types based on their underlying physiological, psychological, and spiritual causes. Caraka states that persons suffering from flatulency dream of flying in the sky or fleeing from tigers, while those with bilious disorders dream of entering fire or seeing lightning.

The Samkhya system systematically outlines 11 kinds of anæsthesia of the sense-organs corresponding to the eleven kinds of sense-organs alongside 17 other kinds of the disorders of the intellect, making 28 kinds of disorders of the intellect altogether.

Sushruta details the eye-ball as about an inch in diameter, composed of 5 elements, featuring 5 maṇḍalas or circles in the eye, and 6 paṭalas or layers in the eye, alongside 6 types of liṅganāśa specific to the dṛṣṭi.

Caraka explains that sense-organ disorders and resulting perceptual abnormalities stem from 4 kinds of correlation or contact of the sense-organs with their objects.

10. Super-Normal Perception and Divine Consciousness

Ascetic meditation, yogic ecstasy, and the eradication of karma unlock super-normal intuition, culminating in divine omniscience and the witness self.

Yogic Perception

The Mīmāṁsaka school denies yogic perception, arguing that sense-organs cannot transcend their natural limitations to apprehend past, distant, or future objects. Yamanacharya argues in Siddhitraya that external sense organs only cognize when in direct contact with objects.

Cats can see objects in utter darkness and vultures can see from a very great distance.

Sridhara and Jayanta Bhatta argue that perceptual capacity can reach a peak of perfection through intense meditation on the self and akasa. Prasastapada divides yogic perception into yukta-pratyakṣa (ecstatic perception) and viyukta-pratyakṣa (non-ecstatic perception). Patañjali classifies the mind into five stages of control and recognizes conscious and supra-conscious ecstasy achieved through systematic mental restraint.

You can engage specific practices to master concentration:

• Perfect posture of the body (āsana)
• Regulation of breathing (prāṇāyama)
• Withdrawal of the mind from distracting influences (pratyāhāra)
• Fixation of the mind on certain parts of the body (dhāraṇā)
• Constant meditation on the same object (dhyāna)

Buddhism achieves super-normal consciousness through successive stages of jhanas by eliminating discursive factors of consciousness. The Jaina school rejects an external creator God and maintains that the individual self achieves omniscience by completely destroying karma-matter. Ordinary persons can occasionally experience prātibhajñāna regarding future events independently of the senses.

Divine and Witness Perception

Patañjali proves the existence of an omniscient God through an ontological argument based on the gradation of supersensuous knowledge. Divine knowledge is eternal, beginningless, endless, and perceptual in character, grasping the entire universe through a single all-embracing intuition. Udayana addresses how an omniscient God perceives human illusions without Himself falling into illusion.

According to the Śaṁkara-Vedānta, the internal organ particularizes eternal consciousness differently to form the empirical Jiva and the transcendental Jiva-Saksi. Universal consciousness is determined by cosmic nescience in two distinct ways, giving rise to Isvara and Isvara-Saksi.

Devadatta acting as a cook and a reader illustrates how different functions can share the exact same underlying person or substratum.

There is a plurality of Jiva-Saksins due to multiple internal organs, but there is only one eternal Isvara-Saksi due to the oneness of cosmic Maya.

10 Key Ideas

1. Indian psychology synthesizes psychological, logical, and epistemological problems within metaphysical frameworks, anchoring perceptual and conscious phenomena in introspection and internal instruments rather than empirical experimentation.
2. Ancient Indian systems analyze the physical basis of perception by tracing the nervous system, internal manas, and sense-organs evolving from material elements or cosmic egoism.
3. Perception unfolds in distinct stages from non-relational indeterminate apprehension to relational, articulate determinate cognition across diverse philosophical schools.
4. External and internal perceptions depend on specific material magnitudes, manifest qualities, ordinary intercourse, and extraordinary alaukika sannikarṣa.
5. Philosophical schools explain recognition and perception through unique psychological compounds, mental chemistry, and structured perceptual definitions.
6. Sāṁkhya and Vedānta describe perception through out-going vṛttis, internal organ coordination, and the transcendental reflection of the puruṣa.
7. Space, movement, and time are analyzed as intellectual constructions, auditory qualifying adjuncts, or lived coefficients of consciousness rather than empty absolutes.
8. The debate over universals encompasses Buddhist nominalism, Jaina modified nominalism, conceptualism, and Nyāya-Vaiśeṣika realism.
9. Indefinite perceptions and illusions arise from physiological humours, memory lapses, and structural anomalies, generating multiple epistemological theories.
10. Ascetic meditation, yogic ecstasy, and the eradication of karma unlock super-normal intuition, culminating in divine omniscience and the witness self.