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Equiluminant stimuli
Equiluminant stimuli Visual stimuli that vary only in color but not in luminance. Stereopsis and motion perception disappear at equiluminance indicating the presence of separate processing channels for color, motion and stereopsis.
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Stereopsis
Also known as depth perception. The separation between the eyes provides for slightly different views of an object by each eye. The brain for the purpose of telling the location of an object in 3D space uses this difference in views between the eyes or disparity.
SIMILAR TERMS--------------------------------------
Equilibrium disorders
Balance disorders.
Equinophobia
An abnormal and persistent fear of horses. Sufferers of equinophobia experience undue anxiety even when a horse is known to be gentle and well trained. They usually avoid horses entirely rather than risk being kicked, bitten or thrown. They may also fear other hoofed animals such as ponies, donkeys and mules.
Equipin
Equipin is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): homatropine methylbromide.
Equipoise
A state in which an investigator is uncertain about which arm of a clinical trial would be therapeutically superior for a patient. An investigator who has a treatment preference or finds out that one arm of a comparative trial offers a clinically therapeutic advantage should disclose this information to subjects participating in the trial. Ethically, subjects should only be entered or continue in a trial where equipoise exists for that subject.
Equivalence trial
A trial with the primary objective of showing that the response to two or more treatments differs by an amount which is clinically unimportant. This is usually demonstrated by showing that the true treatment difference is likely to lie between a lower and an upper equivalence level of clinically acceptable differences.
Equivalence zone
In a precipitin reaction, the region in which the concentration of antigen and antibody leads to maximal precipitation.
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Emmetropia
An eye whose image is focused on the retina, rather than in front of behind it. (As opposed to Hyperopia and Myopia).
End-Inhibition
A property of some cells in the visual cortex which respond strongly to either an edge, a bar or a slit which ends within the receptive field.
End-Stopped cell
An orientation selective cell which is also sensitive to the end of a line or edge, responding to short but not long lines or edge stimuli.
Epicapsular stars
Remnants left on the eye of the hyaloid canal, from development in the womb.
Epipolar line
For a given point in space, this is the line on which the point will fall in the opposite eye. This line is tilted out of the horizontal unless the eyes are fixated on a very distant object.
Equiluminant stimuli
Extrastriate cortex
Region of primate cerebral cortex anterior to striate cortex.
Eyespot
A concentrated patch of photoreceptor cells on the skin present in some species.
Ecchymosis
A purplish patch caused by extravasation of blood into the tissues differing from petechiae only in size.
Encyst
To enclose in a cyst or sac.
Embolism
The sudden blocking of an artery by a clot of material (embolus). The process of the formation of an embolus.
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