Term
Perception
What is perception?
Answer
Definition
The process of interpreting and organizing sensory information to understand and interact with the environment.
Perception is the process by which we interpret and organise sensory information to understand and interact with our environment. It goes beyond simply seeing or sensing; perception involves active interpretation of sensory data to form a meaningful experience, allowing us to make sense of the world around us. This section covers key concepts related to visual perception, including depth cues, visual illusions, visual constancies, and two main theories explaining how perception occurs.
These cues are useful for judging depth and distance when using a single eye.
Completing the list of essential depth cues, including the mechanism requiring two eyes.
When perception fails to match physical reality, revealing how the brain interprets sensory input.
Our ability to perceive certain attributes of objects as stable, despite changes in sensory information.
All information needed for perception is directly available in the environment, requiring no cognitive interpretation.
Perception is a constructive process that depends on interpretation, inferences, and prior knowledge.
A mental predisposition to perceive things in a certain way based on various factors (a, b, c, d).
Motivation: We are more likely to see what we want or need (e.g., hungry people may perceive food-related words faster).
Expectation: Formed by prior knowledge or context and can bias perception; more likely to perceive a certain object if expected.
Emotion: Emotional state can alter perception (e.g., a fearful person might overestimate the size or proximity of a threat).
Culture: Shapes perception by influencing what is familiar or important, affecting sensitivity to certain details.
What is perception?
The process of interpreting and organizing sensory information to understand and interact with the environment.
What are monocular depth cues?
Depth cues that require only one eye, such as superimposition, relative size, linear perspective, texture gradient, and height in the plane.
What is binocular depth cue 'stereopsis'?
The brain’s ability to combine two slightly different images from each eye to perceive depth in 3D.
Define visual illusions.
Misinterpretations of sensory information where perception does not match physical reality.
What is shape constancy?
The perception that an object’s shape remains constant despite changes in viewing angle.
What does the direct theory of perception propose?
Perception arises directly from sensory input from the environment without cognitive interpretation.
What are affordances according to Gibson’s theory?
Opportunities for action that objects provide, perceived directly from the environment.
How does the constructivist theory explain perception?
Perception is a constructive process based on interpretation, inferences, prior knowledge, and hypotheses about sensory input.
Give examples of monocular cues.
Superimposition, relative size, linear perspective, texture gradient, height in the plane.
What is perceptual set?
A mental predisposition to perceive stimuli in a particular way influenced by motivation, expectation, emotion, and culture.
What is colour constancy?
The perception that an object’s colour remains stable under different lighting conditions.
What are ambiguous figures?
Images that can be interpreted in more than one way, e.g., Rubin’s vase.
What role does prior knowledge play in perception?
It helps the brain interpret ambiguous or incomplete sensory input through experience and context.
Why does size constancy occur?
To perceive objects as having a stable size despite changes in retinal image size caused by varying distance.
What is optic flow?
The pattern of motion perceived during movement through the environment that provides cues about speed and direction.