Perception - Chapter 8 Lecture

akinotopsia

motion is either difficult or impossible to perceive

what can cause akinotopsia?

TBI, neurodegenerative disease like Alzheimer’s, epilepsy

when do observers perceive shapes more rapidly and accurately?

when an object is moving

biological movement

when a person or animal moves, movement of individual units - arms, legs, and body - become coordinated with each other

event

segment of time at a particular location that is perceived by observers to have a beginning and an end

event boundary

the point in time in which one event ends and another begins

when are event boundaries more likely to occur?

when there is change in speed or acceleration of movement

induced motion

when motion of one object (usually a large one) causes a nearby stationary object (usually smaller) to appear to move

motion aftereffects

when viewing a moving stimulus causes a stationary stimulus to appear to move

optic array

the structure created by the surfaces, textures, and contours of the environment

corollary discharge theory

the image displacement signal, motor signal, and the corollary discharge signal

image displacement signal

occurs when an image moves across the retina

motor signal

sent from the motor area to the eye muscles to cause the eye to move

corollary discharge signal

a copy of the motor signal

Reichardt detector circuit

A and B, which send their signals to an output unit that compares the signals it receives from neurons A and B

delay unit

slows down the signals from A as they travel toward the output unit

output unit

multiplies the responses from A and B to create the movement signal that results in the perception of motion