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Science 20 December 1996:
Vol. 274. no. 5295, pp. 2110 - 2115
DOI: 10.1126/science.274.5295.2110
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Reports
Orientation Maps of Subjective Contours in Visual Cortex
Bhavin R. Sheth,
Jitendra Sharma,
S.
Chenchal Rao,
Mriganka Sur
*
Responses to subjective contours in visual cortical areas V1 and V2
in adult cats were investigated by optical imaging of intrinsic signals
and single-unit recording. Both V1 and V2 contain maps of the
orientation of subjective gratings that have their basis in specific
kinds of neuronal responses to subjective orientations. A greater
proportion of neurons in V2 than in V1 show a robust response to
subjective edges. Through the use of subjective stimuli in which the
orientation of the luminance component is invariant, an unmasked V1
response to subjective edges alone can be demonstrated. The data
indicate that the processing of subjective contours begins as early as
V1 and continues progressively in higher cortical areas.
Department of Brain and Cognitive Sciences, Massachusetts Institute of
Technology (MIT), Cambridge, MA 02139, USA.
*
To whom correspondence should be addressed at Department of Brain
and Cognitive Sciences, MIT, E25-235 Cambridge, MA 02139, USA. E-mail:
msur{at}wccf.mit.edu
Read the Full Text
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