Do vision cells have an intrinsic orientation?
KPaulC at email.msn.com
Thu Aug 12 21:22:59 EST 1999
this's old stuff, reprocessed.
John wrote in message <934445410.493792 at server.australia.net.au>...
>"Many of our brain cells that are used for vision are programmed to respond
>to stimuli that has a specific orientation, such as horizontal stripes.
>These "orientation-sensitive" cells represent one stop on the way to
>processing the visual world. Are some cells already programmed to process
>only horizontal-- and not vertical -- stripes before we ever open our eyes
>for the first time, or do the things we see early in life program the cells
>instead? This is a classic 'nature-versus-nurture' question.
>Frank Sengpiel and colleagues from the Max-Planck-Institut für
>Neurobiologie, München-Martinsried, Germany, have tackled this question.
>Their results, reported in the August issue of Nature Neuroscience, show
>that the development of these orientation-specific cells involves a little
>of both nature and nurture. There appear to be cells for all orientations,
>regardless of visual experience. But some shifting of cells can occur if
>orientation is seen early in life more frequently than the others."
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