Chap 8 Flashcards
Motion detector
Two adjacent receptors that can register change over time
Apparent motion
The illusion of a smooth motion that results from an object moving super fast between locations
Aperture
An opening where you can only see a part of an object
Correspondence problem
When the motion detector system cannot tell what feature in frame 2 corresponds to a specific feature in frame 1
Aperture problem
When an object is only partially viewed in a receptive field the direction of motion of the local feature and part of the object cannot be determined
Magnocellular layers
Of LGN impair perception of large rapidly moving objects
Middle temporal lobe
(MT) plays an important role in motion perception
Most neurons in MT are selective for motion in a specific direction
Newson& pare (1988)
Trained monkeys to respond to correlate dot motion displays
Monkeys needed 10 times as many dots to correctly identify direction of motion
Motion after effect (MAE)
The illusion that a stationary object is moving after staring at a moving object
Implies opponent process system
Interocular transfer
When an effect like adaptation transfers from one eye to another
MAE
Exhibits interocular transfer and must occur in neurons that responds to both eyes
First-order motion
The motion of an objects that is based on changes in luminance
Second-order motion /texture defined
Motion that changes in contrast or texture only
Optic array
The collection of light rays that interact with objects in the world
Optic flow
The changes in angular position of points based on the perceptive of an image that we see as we move through the world
Focus of expansion
The focus of the expansion of the observer which way they are heading
Tau
Information in the optic flow that signals TTC without needing to estimate absolute distances or rates
V1 and MT
V1- local (gets parts of edges )
MT- global ( puts it together)
Eye muscles
Six muscles attached to each eye & arranged in three pairs
Superior colliculus
A structure in the mid brain that initiates and guides eye movements (electrically stimulated)
Saccadic suppression
The reduction of visual sensitivity happens when we make saccadic eye movements
Comparator (discriminates eye movement )
Receive one copy of the order issue by the motor system when the eyes move the other copy goes to the eye muscles
Akinetopgia
No perception of motion cause by disruption to cortical are MT
