GCSE Psychology: Perception - Visual Illusions and Depth Cues Guide

What is perception?

Perception is the process of organising and interpreting sensory information to make sense of the world around us, going beyond simply sensing raw information.

Depth cues

Monocular depth cues (needing only one eye) include height in plane and relative size. Binocular depth cues (needing both eyes) include retinal disparity, where each eye sees a slightly different image, helping us judge distance.

Visual illusions

Visual illusions, such as the Müller-Lyer illusion, trick our usual perceptual processes, showing how our brain actively interprets, rather than simply records, visual information.

Factors affecting perception

Perception can be affected by factors such as culture, expectation, motivation and emotion — two people can perceive the same scene differently depending on these influences.

Common mistakes

• Confusing sensation (raw sensory input) with perception (interpreting that input).
• Mixing up monocular and binocular depth cues.
• Describing an illusion without explaining what it reveals about how perception works.