| aperture problem | The inability of a motion sensor with a restricted field of view to register unambiguously the direction of motion of an extended contour moving through the sensor's field of view.
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| apparent motion | The illusory impression, created by the rapid alternation of objects presented at different spatial locations, that the objects have moved smoothly from one location to the other. See element movement, group movement.
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| critical flicker frequency (CFF) | The highest perceptible rate of temporal variation in light intensity.
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| direction-selective cell | A neuron in the visual cortex that responds most vigorously to a particular direction of target movement.
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| global motion | The experience of motion in a single direction that arises from a stimulus whose elements move in a variety of different directions.
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| induced motion | The illusory impression, created when moving contours are nearby a stationary object, that the stationary object is moving.
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| Law of common fate | The tendency to group together individual elements moving in the same general direction at the same speed.
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| motion aftereffect (waterfall illusion) | The illusory impression, after prolonged viewing of movement in one direction, that a stationary object is moving in the opposite direction.
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| motion capture | An object that moves in one direction over a field of randomly moving elements causes those elements to appear to move in the same direction as the object itself.
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| multiple object tracking | Ability to keep track, over time, of multiple, spatially dispersed, independently moving objects.
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| optic flow | The dynamic pattern of retinal image stimulation produced when objects move toward or away from an observer or when an observer moves through a cluttered environment.
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| point-light motion | Motion created by dots of light placed on the joints of a biological organism (e.g., a person) engaged in an activity (e.g., walking).
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| pursuit eye movements | Smooth movements of the eyes that allow them to follow a moving target.
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| saccades | Rapid, jerky movements of the eyes, which function to change fixation from one location to another.
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| smooth eye movements | Smooth movements of the eyes, which can function in the pursuit of a moving target.
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| structure from motion (SFM) | The impression of an object's shape derived from the object's motion.
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| waterfall illusion | See motion aftereffect.
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