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Representation is space-variant

Published online by Cambridge University Press:  01 August 1998

Giorgio Bonmassar  and
Eric L. Schwartz
Giorgio Bonmassar
Affiliation:
Department of Biomedical Engineering, Boston University, Boston, MA 02215 giorgio@bu.edu
Eric L. Schwartz
Affiliation:
Department of Cognitive and Neural Systems, Boston University, Boston, MA 02215 eric@bu.edu
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Abstract

Under shift, caused for example by eye movement, or by relative movement of the subject or object of perception, the cortical representation undergoes very large changes in “size” and “shape.” Space-variance of cortical representation rules out models that fundamentally require linear interpolation between shifted patterns (e.g., Edelman's model) or rigid shift of an invariant retinal stimulus corresponding to shift at the cortex (e.g., the shifter theory of van Essen). Recently, a computational solution of “quasi-shift” invariance for space-variant mappings has been constructed (Bonmassar & Schwartz 1997a; 1997b).

Type
Open Peer Commentary
Information
Behavioral and Brain Sciences , Volume 21 , Issue 4 , August 1998 , pp. 469 - 470
Copyright
© 1998 Cambridge University Press

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