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Results for “ADAPTATION, OCULAR”

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At least 55 records · Page 3Linked to original sources
PubMed1963

Adaptation to displaced vision: visual, motor, or proprioceptive change?

After seeing his hand through wedge prisms, a subject points incorrectly with that hand at auditory as well as visual targets. The other hand is virtually unaffected. Thus the change cannot be solely visuo-motor or visual. Other evidence suggests that it is a change in felt hand location, rather than motor learning. When the subject's adapted hand feels as if it is pointing straight ahead, for example, it is actually pointing off to one side.

Acclimatization↗
PubMed1963

Adaptation to chromatic aberration by the human visual system.

Prolonged exposure to the chromatic dispersion produced by prism spectacles leads to a perceptual adaptation. The adaptation develops rapidly in the first two days of the wearing of the spectacles, and seems to be a special reac ion to the relative change in illuminance at intensity gradients on the retina.

Adaptation, Ocular↗
PubMed1964

LIGHT ADAPTATION KINETICS: THE INFLUENCE OF SPATIAL FACTORS.

Reducing the target diameter of an adapting (conditioning) flash of light results in a progressive rise in the conventional light adaptation curve, as measured with a small superimposed test flash presented at the end of adapting flashes of variable duration. When both targets are the same size, an abrupt and marked rise in threshold is obtained, resulting from a unique effect that occurs near the termination of the adapting flash. This effect can be demonstrated by means of a variable delay procedure, and it indicates that neural as well as photo-chemical processes limit the time course of light adaptation.

Acclimatization↗
PubMed1965

PRIMATE RETINA: DUPLEX FUNCTION OF DARK-ADAPTED GANGLION CELLS.

Certain ganglion cells from the central region of dark-adapted retina of the rhesus monkey respond to stimulation of both rod and cone receptors. With dim stimuli the function of these ganglion cells is determined entirely by the rods; with brighter stimuli that affect both dark-adapted rods and cones, little evidence of rod function is detectable because a cone mechanism appears to determine both the latency and frequency of ganglion-cell firing.

Acclimatization↗
PubMed1989

Effects of optokinetic velocity and medial vestibulo-cerebellum lesions on vestibulo-ocular reflex direction adaptation in the cat.

Adaptive horizontal vestibulo-ocular reflex eye movements in response to vertical (pitch) rotations were produced by exposing three cats to synchronized horizontal optokinetic and vertical vestibular oscillations at 0.25 Hz. The effects of optokinetic stimulus velocity (6-80 degrees/s peak) and nodulo-uvular cerebellum lesions were studied. All optokinetic velocities elicited vestibulo-ocular reflex direction adaptation. though 6 degrees/s stimuli were somewhat less effective. Restricted aspirations of cerebellar vermis lobules IX and X in two cats resulted in reduced but still clearly evident adaptation.

Adaptation, Physiological↗