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Science 14 September 1973:
Vol. 181. no. 4104, pp. 1053 - 1055
DOI: 10.1126/science.181.4104.1053
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Articles

Two Visual Systems in the Frog

David Ingle 1

1 Neuropsychology Laboratory, McLean Hospital, Belmont, Massachusetts 02178

After unilateral removal of the optic tectum in frogs, the cut optic tract regenerates to the remaining ipsilateral tectum. Although the orienting movementselicited by moving objects (food or threats) are now directed mirror-symmetrically to normal responses, these frogs correctly localize stationary objects as barriers. Apparently, thalamic and tectal visual mechanisms can operate independently.


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