Chapter 7 Flashcards
Aperture problem
The impossibility of determining the actual direction of motion of a stimulus by the response of a single neuron that sees the stimulus only through a small aperture and sees only the component of motion in the neurons preferred direction
Motion after affect
A visual illusion in which a stationary element of the visual scene appears to be moving in a direction opposite to the direction of motion experienced during, and immediately preceding time interval
Apparent motion
A visual illusion in which two stimuli separated in time and location are perceived as a single stimulus moving between the two locations
Apparent motion quartet
A display in which four symmetrically placed stimuli presented at alternating moments in time are perceived as two stimuli in apparent motion
Random dot kinematogram
A display in which a grid is filled with tiny, randomly placed black and white square dots and in which the dots Ina region of the grid are then moved rigidly together as a group
Point-light walker
A display in which biological motion is made visible by attaching small lights at critics locations on an organisms body and then shooting a video of the organism in motion in darkness
Saccadic eye movements
Brief, rapid eye movements that change the focus from one location to another
Smooth pursuit eye movements
Eye movements made to track a moving object or to track a stationary object while the head is moving
Vengeance eye movements
Eye movements that occur when the gaze shifts between focussing on objects at different differences
Saccadic suppression
The visual systems suppression of neural signals from the retina during saccadic eye movements
Corollary discharge signal (CDS)
A copy of an eye-movement command from the superior colliculus to the extraocular muscles, sent to the brain to inform the visual system about upcoming eye movements; used to ensure a stable visual experience even during eye movements
Lateral intraparietal area (LIP)
a region of he posterior parietal lobe in monkeys that is involved in the control of eye movements, including intended eye movements; an analogous region exists in the human brain.
Medial intraparietal area
A region of the posterior parietal lobe involved in planning reach movements
Anterior intraparietal area
A region of the posterior parietal lobe thought to be involved in grasping movements
Linear optic trajectory
A strategy for catching a fly-ball by which the fielder runs in a path and at at a speed such that the ball appears to travel upward in a straight line at a constant speed
