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Texton
Texton The basic textural elements of pre-attentive vision such as elongated blobs or line segments and their terminators which are important for segregation of textures.
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Vision
The sense of sight.
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Tectopontine tract
Relays information from the colliculus to the cerebellum for further coordination of eye and head movement.
Tectospinal tract
Axons from the colliculus to the upper spinal cord where the neck motor neurons are located. Involved in reflex control of head and neck movements.
Template matching
An object recognition method. Incoming patterns are matched against a set of templates. If there is sufficient overlap between object and template, a match is signaled. Of limited use, primarily in alphanumeric character recognition.
Temporal hemiretina
That portion of the retina that lies lateral to the fovea.
Tetrachromatic color vision
Color vision based on four cone photoreceptor pigments in the retina. The fourth cone type is sensitive to U.V. light and seen in goldfish.
Texton
Transducin
A regulatory g-protein in photoreceptors which stimulates phosphodiesterase molecules and acts as an amplifier of the incoming light signal.
Thoracentesis
Puncture of the pleural cavity.
Thrombocytopenia
Decrease in blood platelets.
Thromboembolus
A clot of material that breaks free from a primary site, is transported in the bloodstream and becomes lodged and adhered at a secondary site.
Tactile hallucination
A hallucination involving the perception of being touched or of something being under one's skin. The most common tactile hallucinations are the sensation of electric shocks and formication (the sensation of something creeping or crawling on or under the skin).
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