Reading focus
Syllabus: How Do We Perceive the World?
Evaluate the chapter’s relational definition and its stronger claim about directly perceiving affordances. Compare the explanatory question with the earlier recognition and inference accounts before treating them as simple opposites.
A question to consider. Does knowing that a doorway affords passage explain how a person detects that fact? State what evidence the perceptual explanation still needs.
Why this reading
Gibson asks whether we perceive possibilities for action, such as support or passage, rather than first perceiving neutral properties and then adding meaning. His relational account offers a different starting point for explaining perception.
Before you read
An affordance is a possibility for action relative to an animal’s capacities and its environment. It differs from the animal noticing that possibility or choosing to act. Direct perception is Gibson’s claim about information available for perception; it does not mean that eyes work without a nervous system or experience.
Read for
- Examine why the same surface can offer different possibilities to different animals.
- Separate the definition of an affordance from the claim that information specifies it in ambient light.
- Evaluate the examples of mistaken perception and the argument against treating meaning as something simply added to neutral sensations.
Consider afterwards
- A doorway admits one person but not another. What defines the affordance, what information might reveal it, and what could make either person judge it incorrectly?
Editorial context
This is Chapter 8 of Gibson’s 1979 book, a theoretical argument rather than a report of one experiment. Its account of direct perception is a substantive commitment to assess. Defining an action possibility relationally does not alone establish how it is perceived or whether successful action has a sharp boundary.