Glossary of Chapter 7, psych

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Motion aftereffect
after viewing motion in a constant direction for a sustained period of time, you see any stationary objects that you view subsequently as moving in the opposite direction.
-implies opponent process system
-interocular transfer means MAE occurs in part of the visual system where info from both eyes is combined
Apparent motion
the illusory impression of smooth motion resulting from the rapid alteration of objects that appear in different locations in rapid succession.
Problems with apparent motion:
1. correspondence problem
2. aperture problem
Correspondence problem
How do we know which feature in frame two corresponds to which feature in frame 1
Aperture problem
the fact that when a moving object is viewed through an aperture (or a receptive field), the direction of motion of a local feature or part of the object may be ambiguous.
Middle temporal lobe
An area of the brain thought to be important in the perception of motion
Types of motion:
1st order motion: the motion of an object that is defined by changes in luminance

2nd order motion: the motion of an object that is defined by changes in contrast or texture, but not luminance.
Superior colliculus
Midbrain structure that guides eye movements
Types of Eye movements:
*smooth pursuit: eye move smoothly to follow moving objects
*saccades: rapid, change fixation form one location to antoher
*vergence: rotate inward/outward to focus on object
*saccades: fast jumps (up to 1000/second); rapid movement of the eyes that change fixation from one object or location to another
saccadic suppression
the reduction of visual sensitivity that occurs when one makes a saccadic eye movement. Saccadic suppression eliminates the smear from retinal image motion during an eye movement.
optic array
the collection of light rays that interact with objects in the world in front of a viewer
optic flow
the changing angular positions of points in a perspective image that you experience as you move through the world
An area of the visual system that receives one copy of the order issued by the motor system when the eyes move (the other copy goes to the eye muscles). The comparator can compensate for the image changes caused by the eye movement.
Focus of expansion
all points seem to emanate
A rare neuropsychological disorder in which the affected individual has no perception of motion.

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