Gibson vs Gregory - Nature and Nurture Theories of Perception
How does the brain turn a flat retinal image into a rich 3D world? Two theories disagree: Gibson says perception is direct and innate, Gregory says the brain constructs it from experience.
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Building the 3D world 👁️
Each eye receives a flat, upside-down image, yet you experience a rich **three-dimensional** world. How? Psychologists disagree, and the debate is a classic **nature versus nurture** clash. **Gibson** says perception is **direct** - the information is already there in what we see, and it is largely **innate**. **Gregory** says the brain **constructs** perception, using **past experience** to make sense of incomplete information. This module pits the two theories against each other.
The words you need 🔑
Four terms unlock the whole topic.
Match each depth cue 📏
- Superimposition
- Relative size
- Linear perspective
- Texture gradient
- A nearer object overlaps and hides part of a farther one
- Objects that are farther away appear smaller
- Parallel lines appear to converge as they recede
- Surface detail looks finer and denser with distance
One eye or two? 👀
Which of these depth cues is binocular, needing both eyes?
- Stereopsis
- Relative size
- Superimposition
- Texture gradient
The two theories ⚖️
This is the heart of the topic. Learn which side each idea sits on.
The two theories in a paragraph 🧩
Gibson's theory says perception is _____, coming straight from rich sensory input, so it is a _____-based theory. Gregory's theory says perception is a _____: the brain uses prior _____ to form a perceptual _____.
When perception goes wrong 💡
The theories predict different things about **visual illusions**: - For **Gregory**, an illusion is the brain applying a **wrong hypothesis** - strong evidence for the constructivist view. - **Gibson** struggles more with illusions, but explains everyday accurate perception well through direct information like optic flow. Gregory's idea links to **perceptual set**: our tendency to perceive in a certain way, influenced by **motivation, expectation, emotion and culture**.
Match each concept to its meaning 🔬
- Affordance
- Optic flow
- Perceptual hypothesis
- Perceptual set
- The possible action an object offers, perceived directly
- The changing pattern of light as we move through the world
- The brain's best guess about what is being seen
- A tendency to perceive things a certain way, shaped by expectation
What illusions show 🌀
A visual illusion tricks the brain into a wrong perception. Which theory does this best support?
- Gregory's constructivist theory, because the brain has applied a wrong hypothesis
- Gibson's direct theory, because perception is always accurate
- Neither theory can explain illusions at all
- Both theories predict illusions equally well
How Gregory says we perceive 🪜
An interactive activity.
Spot the constructivist ideas ✅
Select the TWO features of Gregory's constructivist theory.
- Perception uses prior knowledge and experience
- The brain forms a perceptual hypothesis
- Perception is direct, needing no inference
- Perception is based on affordances in the environment
Which theory fits? 🧭
An interactive activity.
Your turn: compare 🖊️
An interactive activity.
The grade-9 habit 🌟
The exam rewards a clear grip on the **nature/nurture split**: Gibson is **direct, bottom-up and nature-based**; Gregory is **constructivist, top-down and nurture-based**. Never mix them up. Then show you can **apply** them: illusions and perceptual set support **Gregory** (a wrong or expectation-driven hypothesis), while optic flow and affordances support **Gibson**. And if you cite a study, use one of **Edexcel's own** named studies rather than another board's - the theory is shared, but the studies you are examined on are not.