Intentionalism about Perception

Intentionalism holds that perceptual experience is a representational state: it presents the world as being a certain way and is accurate when the world matches that content. A straight stick in water can be represented as bent; a hallucination can represent a red apple when no apple exists. Error therefore requires no private object that literally has the apparent property.

As a theory of perception, intentionalism explains the common factor among veridical, illusory, and hallucinatory cases. It is broader than strong representationalism about consciousness. One can hold that every perceptual experience has content while denying that content exhausts phenomenal character.

Accuracy conditions

A perceptual state has accuracy conditions specifying how the environment must be for the experience to be veridical. A visual experience as of a red sphere is accurate only if an appropriate red spherical object is present in the represented location.

This allows one type of state to occur in three ways:

• veridical: the represented object and properties are present;
• illusory: an object is present but one or more represented properties are wrong;
• hallucinatory: the represented scene lacks the ordinary object entirely.

The representation can be false because content is fixed by the system's normal function, causal history, or role rather than by whatever happens to cause the current token. The general theories of content are developed in Naturalizing Mental Content.

Perception is not judgment

Perceptual representation need not be a belief. Knowing that two lines in an illusion are equal does not stop one from looking longer. Experience can present what judgment rejects. This recalcitrance supports a distinct perceptual level with its own format and update rules.

Nor must perceptual content be sentence-like. It may encode magnitudes, spatial relations, object files, affordances, and probability distributions. The word "representation" commits the theory to correctness conditions and systematic use, not to an inner sentence viewed by a homunculus.

The distinction explains why perception can justify belief without itself being a belief. Experience supplies world-directed content that a subject may accept, doubt, or override.

Conceptual and non-conceptual content

Conceptualism holds that perceptual content is structured by concepts available to the subject. This connects perception with reasons and judgment: an experience can justify a belief because both occupy conceptual space.

Non-conceptualism notes that perception is more fine-grained than the concepts a subject possesses. A person may discriminate shades without names or stable concepts; infants and animals perceive before mastering language. Experience also appears to represent continuous magnitudes and egocentric spatial relations unlike propositions.

A mixed view gives perceptual systems non-conceptual content that becomes conceptually available through attention and categorisation. The epistemic question then becomes how non-conceptual representation can serve as a reason rather than merely cause a belief.

Transparency

When subjects attend to visual experience, they seem to encounter the colour and shape of the object, not intrinsic properties of an inner state. This transparency supports intentionalism: phenomenal attention goes through the state to what it represents.

Transparency is compatible with hallucination. A hallucinatory state presents a red apple outwardly even though nothing satisfies the content. It does not present a private red object as private.

Critics point to blur, double vision, afterimages, effort, and familiarity as features of experience not straightforwardly attributed to external objects. Intentionalists can represent them as properties of apparent viewing conditions or add a perceptual mode. The latter weakens the claim that content alone determines character.

Object-dependent and existential content

A veridical perception of a particular tree may have object-dependent content that could not exist without that tree. A matching hallucination cannot share that exact content. This creates tension with the common-factor aim.

One solution distinguishes levels:

• a narrow existential content such as there is a tree thus-and-so located, shared by perception and hallucination;
• a singular content involving this particular tree, available only in the good case.

Another rejects a common content and moves toward disjunctivism. A third allows an empty singular content in hallucination. Each must explain subjective indistinguishability and the explanatory generalisations supported by the shared internal state.

Perceptual constancy

The retinal projection of an object changes with distance, angle, illumination, and movement, while the object is experienced as relatively constant. Intentionalism explains this by distinguishing proximal sensory registration from distal content. The system represents stable size, shape, and colour by using contextual information.

Constancy shows why perception cannot simply copy stimuli. It infers or tracks worldly properties through changing evidence. Illusions occur when mechanisms that normally support constancy are applied under unusual conditions.

This is compatible with predictive and ecological approaches. The dispute concerns whether the achievement is best modelled as constructing an internal content, directly detecting invariants through active exploration, or both.

Hallucination and causal matching

If direct stimulation reproduces the neural state normally caused by a red apple, intentionalism predicts a matching representational experience. The token is inaccurate because no apple satisfies it. This integrates hallucination into ordinary perceptual psychology.

The screening-off concern is that the external object appears to make no constitutive difference once the internal representation is fixed. The object causes but does not partly constitute experience. Naive realists regard this as losing perceptual contact.

Intentionalists reply that representation is not a veil. The subject need not perceive the internal vehicle; the state is directly about the apple. Causal mediation and representational content are the means by which ordinary objects are perceived.

Perceptual presence

Seen objects feel present in a way imagined objects do not, even when content overlaps. Intentionalists explain this through richer detail, involuntary updating, egocentric location, sensorimotor expectations, or a distinctive assertoric mode.

No one factor seems sufficient. Imagery can be detailed; hallucination can be vivid; perception can be uncertain. A plural account may treat presence as a cluster involving world-sensitive control, counterfactual responsiveness, and a mode that presents content as currently given.

If perceptual presence cannot be reduced to content, intentionalism remains a theory of world-directedness rather than a complete theory of phenomenology.

The causal theory of perception

Veridical perception normally requires that the object appropriately cause the experience. Accidentally having an accurate hallucination while a matching object sits behind an opaque barrier is not seeing that object.

A causal theory therefore adds to accurate content:

$$Perceives(S,O)\Rightarrow Accurate(S,O)\wedge AppropriateCause(O,S).$$

The word "appropriate" excludes deviant chains, such as a tree causing an artist to paint a picture that later causes an experience. Specifying it may require information- preserving, counterfactually sensitive dependence.

The causal condition explains why veridical hallucination is not perception. It still treats the experiential state as internally common; the external relation determines whether the state counts as seeing.

Epistemic role

Perceptual experiences justify beliefs partly because they present the world as being a certain way. Their content can stand in rational relations to judgment. Reliability and appropriate causation connect the content with fact.

If hallucination has the same content and phenomenal character, the subject may have the same internal justification in both cases while only the good case yields knowledge. Externalist epistemology can add reliability; disjunctivists instead give the good case a stronger factive reason.

Intentionalism therefore fits fallibilist perceptual knowledge naturally. It is less suited to a conception on which seeing that $p$ places the fact itself, rather than a representational intermediary, within the subject's reason.

Assessment

Intentionalism offers the strongest common-factor account without private objects. Its success depends on explaining content and perceptual mode independently, and on showing that representation connects subjects to the world rather than recreating the veil in functional form.

Selected references

• Burge, Tyler. Origins of Objectivity (2010).
• Byrne, Alex. "Intentionalism Defended" (2001).
• Dretske, Fred. Naturalizing the Mind (1995).
• Siegel, Susanna. The Contents of Visual Experience (2010).
• Tye, Michael. Ten Problems of Consciousness (1995).