Computation
A change in position over time
What is motion?
An opening that allows only a partial view of
an object
What is aperture
The collection of light rays that interact with objects in the world in front of a viewer
What is the optic array?
The three kind of voluntary eye movements
What is smooth pursuit, saccade, and vergence?
SP – eyes smoothly follow moving target
S – rapid movement that changes focal point
V – eyes move in opposite directions, converge or diverge
Number of muscles attached to the eye
(three pairs of each)
A combination of multiple motion detectors that begins with two adjacent receptors that registers motion
What is a motion detection circuit?
The (illusory) impression of
smooth motion resulting from the rapid alternation
of objects appearing in different locations in rapid
succession
What is apparent motion?
The changing angular position of points in a perspective image that we experience as we move through the world
What is the optic flow?
Two kinds of involuntary eye movements
What are microsaccades and reflexive movements?
Whichever possible motion direction is the same
in all apertures is the
What is the true global motion?
The transfer of an effect (such as adaptation) from one eye to another
The illusion of motion that occurs after prolonged exposure to a moving object
What is the Motion After Effect (MAE)?
If moving backward, optic flow reverses, the focus of expansion becomes...
What is Focus of Contraction?
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)
What is the comparator?
(compensates for eye movement)
A rare neurophysiological disorder in
which the affected individual has no perception of
motion.
What is akinetopsia?
(Patients see motion as frames jumping – no smooth movements)
This brain structure plays an important role in motion perception
What is the middle temporal lobe (MT)?
The problem faced by the motion detection system of knowing which feature in frame 2 corresponds to which feature in frame 1
What is the correspondence problem?
The point in the center of the horizon from which, when we are in motion, all points in the perspective image seem to emanate
What is the focus of expansion (FOE)?
Reduction of visual sensitivity that occurs when we make saccadic eye movements
What is saccadic suppression?
Adult-like sensitivity to motion does not
reach maturity until about...
What age is 3/4 years of age?
The motion of an object that is defined by changes in luminance
What is first order motion?
The fact that when a moving object is viewed through an aperture, the direction of motion of a local feature or part of an object may be ambiguous
What is the aperture problem?
Information in the optic flow that could signal time to contact without the necessity of estimating either absolute distances or rates
What is Tau?
What would happen if we didn't have saccadic movements
A structure in the midbrain that is important in initiating and guiding eye movements
What is the superior colliculus?