Gibson vs Gregory: Nature and Nurture Theories of Perception
How does the brain turn what the eyes see into a picture of the world? Compare the direct theory of Gibson, the nature side, with the constructivist theory of Gregory, the nurture side, and learn the depth cues and illusions behind the debate.
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From the eye to the mind
Every moment your eyes take in raw information. Turning that information into a meaningful picture of the world is called perception. Psychologists disagree about how it works. Is perception direct and built in from birth, or is it constructed from experience? This module compares the two great theories, from Gibson and from Gregory.
Sensation and inference words
Four terms run through the whole topic. Learn them first.
Two theories, two sides
The two theories sit on opposite sides of the nature and nurture debate.
Match the term
- Sensation
- Perception
- Depth cue
- Inference
- The raw information the senses take in
- How the brain makes sense of that information
- Information that helps you judge distance
- A conclusion drawn from past experience
Name the theory
Which theory says perception is direct, using information already in the world, and needs no inference?
- The direct theory of Gibson
- The constructivist theory of Gregory
- Both theories equally
- Neither theory
Do not mix them up
The most common mistake is swapping the two. Remember it this way: Gibson is direct and natural, so the world does the work. Gregory is constructive and learned, so the brain does the work by adding inference from past experience.
Match the depth cue
- Retinal disparity
- Convergence
- Relative size
- Occlusion
- Each eye sees a slightly different image
- The eyes turn inward more for closer objects
- The smaller of two equal objects looks further away
- An object that blocks another looks nearer
Monocular cues
Which of these are MONOCULAR depth cues, needing only one eye? Choose all that apply.
- Relative size
- Occlusion
- Linear perspective
- Retinal disparity
- Convergence
How Gregory says we see
Put the steps of the constructivist theory in order.
- Light enters the eye and gives raw sensation
- The raw information is often incomplete
- The brain adds inference from past experience
- A finished perception is constructed
Complete the theories
Sensation is the raw data from the senses, and _____ is how the brain makes sense of it. The _____ theory of Gibson says perception is immediate and needs no _____. The constructivist theory of _____ says we use past experience to build what we see, which is why visual _____ can trick us.
Spot the Gibson ideas
Tap the TWO statements that describe the direct theory of Gibson.
- Perception is immediate and needs no inference.
- The information in the world is enough on its own.
- We use past experience to construct what we see.
- Visual illusions happen because of wrong inferences.
Nature or nurture?
In the nature and nurture debate, which theory is on the NURTURE side, where perception is learned from experience?
- The constructivist theory of Gregory
- The direct theory of Gibson
- Both are on the nature side
- Neither takes a side
Which theory explains it?
For each situation, choose the theory that explains it best.
- A pilot judges distance directly from the way the ground rushes past as the plane moves. Which theory fits?
- You glance at a blurry sign and read the word you were expecting, not the word that is really there. Which theory fits?
- A visual illusion fools you because your brain applies a learned assumption about the world. Which theory fits?
Explain the debate
Explain the nature and nurture debate about perception, using both theories. Say which side each theory takes and give a reason.
- Describe the direct theory of Gibson and why it is the nature side
- Describe the constructivist theory of Gregory and why it is the nurture side
- Explain how visual illusions support one of the theories