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22 Cards in this Set
- Front
- Back
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Apparent motion
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The illusory impression of smooth motion resulting from the rapid alternation of objects appearing in different locations in rapid succession
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Aperture
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An opening that allows only a partial view
of an object |
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Correspondence problem (motion)
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The problem faced by the motion detection system of
knowing which feature in frame 2 corresponds to which feature in frame 1 |
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Aperture problem
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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 an object may be ambiguous
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Motion aftereffect
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The illusion of a stationary object that occurs after prolonged exposure to a moving
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Interocular transfer
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The transfer of an effect (e.g., adaptation) from one eye to the other
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First-order motion
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The motion of an object that is defined by changes in luminance
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Second-order motion
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The motion of an object
that is defined by changes in contrast or texture, but not by luminance |
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Texture-defined (contrast-defined) object
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An object that is defined by change
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Focus of expansion (FOE)
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The point in the center
of the horizon from which, when we are in motion, all points in the perspective image seem to emanate |
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Biological motion
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The pattern of movement of living things (i.e., humans, animals)
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Tau
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ratio of the retinal image size at any
moment to the rate at which the image is expanding (and TTC is proportional to tau) |
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Superior colliculus
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A structure in the midbrain
that is important in initiating and guiding eye movements |
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Frontal eye field
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When this structure is stimulated, eyes move
to specific locations of the visual field, regardless of the movement required |
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Smooth pursuit
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The eyes smoothly follow a moving target
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Saccade
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A rapid movement of the eyes that
changes fixation from one object or location to another. Voluntary and involuntary. 1000 degrees / second! 3 to 4 saccades per second = 172,800 saccades every day |
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Smooth pursuit
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The eyes smoothly follow a moving target
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Interest
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scene based or knowledge based.
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Vergence
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The two eyes move in opposite
directions, as when both eyes turn towards the nose. Focus on near of far objects. |
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Reflexive
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Automatic and involuntary eye
movements (vestibulo-ocular reflex, optikinetic nystagmus, microsaccades, ocular tremor, drift) |
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Saccadic suppression
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The reduction of visual
sensitivity that occurs when we make saccadic eye movements. eliminates the smear from retinal image motion during an eye movement |
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Akinetopsia
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A rare neuropsychological disorder in which the affected individual has no perception of motion
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