Perception: Revision and Exam Practice

This lesson brings together all the key concepts from the perception topic, providing a comprehensive revision resource and exam-style practice for AQA GCSE Psychology.

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Key Concepts Summary

Sensation vs Perception

	Sensation	Perception
Process	Detection of stimuli	Interpretation of stimuli
Direction	Bottom-up	Can be top-down or bottom-up
Involves	Sensory receptors	Brain and cognitive processes

Depth Cues

Monocular cues (one eye): relative size, overlap, height in plane, linear perspective, texture gradient

Binocular cues (two eyes): retinal disparity, convergence

Perceptual Constancies

• Size constancy — objects perceived as same size despite changing retinal image
• Shape constancy — objects perceived as same shape despite viewing angle changes
• Colour constancy — objects perceived as same colour despite lighting changes

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Theories of Perception: Comparison