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Lecture 8

PSYC 2220 Lecture Notes - Lecture 8: Motion Perception, Georg Simmel, Agnosia

Course Code
PSYC 2220
Laurie Wilcox

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Chapter 8: Perceiving Motion
Functions of Motion Perception
oMotion  Understand Events in the Environment
oMotion attracts Attention
oMotion  Information about Object
Studying Motion Perception
oReal Motion vs Apparent Motion
Information in the Environment
Motion Perception: Retina / Eye information
oReichardt Detector
oCorollary Discharge Theory
Neural Firing to Motion across the Retina
Eye movements
Biological Motion
Apparent Motion
Motion Perception & the Brain
oMovement Area of the Brain
oE+ects of Lesioning & Microstimulation
oMotion from a Single Neuron’s Point of view
Motion & the Human Body
oApparent Motion of the Body
oMotion of Point-Light Walkers
Representational Momentum
oMotion Responses to Still Pictures
Perception of Motion
oMotion of Self
oMotion of World
oMotion of Both Self & World
oMotion Perception
Perceive the Shape of the Object
Perceive the People’s Mood
Linked to Survival (animals)
Function of Motion Perception
o1. Understanding Events
Movement of Objects / Movement of Observer through Object
 Help the Organization of Stimuli
Heider & Simmel (1944)

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Object moved in Various ways
Nature of the Movements lead Subject to make up Stories
oDescribe Objects as having …
Motion Agnosia
Cortex Damage
Inability to perceive Movement
Blindness of Motion
Dangerous & Debilitating
Crossing the Street
Pouring Co+ee
Social interactions (Appearance & Disappearance of people)
o2. Attracting Attention
Survival in the Environment
Prey Movement (Primary Means of Locating in Hunting)  Predators
Attention Capture
Motion attracts attention
Motionless prey (freezing)  less likely to be noticed
oEliminates the Attention-Attracting E+ect of Movement
oMake it harder for the cat to Di+erentiate between the prey and
its surroundings
NOT only when you are Consciously Looking for something
BUT also while you are paying attention to something else
oAttention may suddenly be captured by something moving in
you peripheral vision
o3. Information about Objects
Freezing of Prey
Less chance to be separated perceptually from its Surroundings in the
Predator’s mind
Ambiguous Objects in the world
Misinterpreted if you / the object do not move
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