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Continuous mapping of direction selectivity in the cat's visual cortex
1Institut für Zoologie der Johannes Gutenberg-Universität Mainz, Arbeitsgruppe III (Biophysik), D-6500 Mainz G.F.R.
Neuroscience Letters
|July 17, 2009
Abstract:
A new method is demonstrated for continuously mapping direction selectivity on complex cells in the cat's visual cortex. A large area random noise pattern which always covers the whole receptive field area is moved along a circular path. The average response histogram yields the cell's selectivity for stimulus direction directly and in much less time than the conventional methods.
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Vision
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Visual System
Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
Once through the pupil, the light passes through the lens, a...

