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Orthogonal coding of object location Per Magne Knutsen1,2

Summary: Orthogonal coding of object location
Per Magne Knutsen1,2
and Ehud Ahissar1
Department of Neurobiology, Weizmann Institute for Science, Rehovot 76100, Israel
Department of Physics, University of California, San Diego, La Jolla, CA 92093, USA
It has been argued whether internal representations are
encoded using a universal (`the neural code') or multiple
codes. Here, we review a series of experiments that
demonstrate that tactile encoding of object location
via whisking employs an orthogonal, triple-code
scheme. Rats, and other rodents, actively move the
whiskers back and forth to localize and identify objects.
Neural recordings from primary sensory afferents, along
with behavioral observations, demonstrate that vertical
coordinates of contacted objects are encoded by the
identity of activated afferents, horizontal coordinates
by the timing of activation and radial coordinates by
the intensity of activation. Because these codes are


Source: Ahissar, Ehud - Department of Neurobiology, Weizmann Institute of Science


Collections: Biology and Medicine