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Gibson's direct theory of perception
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James Gibson (1966) argued that we perceive the world directly from the information reaching our senses, without needing to think or guess. This is a bottom-up theory.
Key ideas
Sensory input: the light reaching our eyes (the optic array) contains all the information we need. Perception starts from this data.
Optic flow: as we move, the scene flows past us. Things near the point we move towards stay still, while things at the edges stream past quickly. This tells us our speed and direction (think of a pilot landing a plane).
Invariants: features of the optic array that stay the same as we move, such as texture gradients and the horizon. They give reliable information about depth and distance.
Affordances: what an object allows us to do, seen directly. A chair affords sitting; a handle affords pulling. We do not need to work it out.
Optic flow: as we move, the scene flows past us. Things near the point we move towards stay still, while things at the edges stream past quickly. This tells us our speed and direction (think of a pilot landing a plane).
Invariants: features of the optic array that stay the same as we move, such as texture gradients and the horizon. They give reliable information about depth and distance.
Affordances: what an object allows us to do, seen directly. A chair affords sitting; a handle affords pulling. We do not need to work it out.
Strengths
It explains how we can perceive and act quickly in the real world, such as catching a ball or driving.
It fits evolution: animals need fast, accurate perception to survive.
It has practical uses: Gibson's work came from training pilots, and road markings that get closer together near junctions use optic flow to make drivers feel they are going faster, so they slow down.
It fits evolution: animals need fast, accurate perception to survive.
It has practical uses: Gibson's work came from training pilots, and road markings that get closer together near junctions use optic flow to make drivers feel they are going faster, so they slow down.
Weaknesses
It cannot explain visual illusions: if perception were direct, we would not be fooled.
It cannot explain perceptual set: people perceive the same thing differently depending on expectation, emotion, motivation or culture.
The idea that affordances are seen directly is hard to test; many uses of objects (such as what a phone affords) seem to be learned.
It cannot explain perceptual set: people perceive the same thing differently depending on expectation, emotion, motivation or culture.
The idea that affordances are seen directly is hard to test; many uses of objects (such as what a phone affords) seem to be learned.
A driver sees the roadside trees stream past faster as she speeds up. Which concept from Gibson's theory explains how she judges her speed?
- As she moves, the scene flows outwards from the point she is heading towards.
- The rate of this flow gives speed information directly: optic flow.
Answer: Optic flow.
Gibson's direct (bottom-up) theory says the optic array holds all the information we need. Optic flow gives speed and direction, invariants give stable cues, and affordances show what objects let us do. It explains fast real-world perception but not illusions or perceptual set.
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