Cerebral Cortex, Vol 8, 510-523, Copyright © 1998 by Oxford University Press
MC Booth and ET Rolls
A view-invariant representation of objects in the brain would have many
computational advantages. Here we describe a population of single neurons
in the temporal visual cortex (IT) that have view-invariant representations
of familiar objects. Ten real plastic objects were placed in the monkeys'
home cages for a period of time before neurophysiological experiments in
which neuronal responses were measured to four views of each object. The
macaques performed a visual fixation task, and had never been trained in
object discrimination. The majority of the visual neurons recorded were
responsive to some views of some objects and/or to the control stimuli, as
would be expected from previous studies. However, a small subset of these
neurons were responsive to all views of one or more of the objects,
providing evidence that these neurons were coding for objects, rather than
simply for individual views or visual features within the image. This
result was confirmed by information theoretic analyses, which showed that
the neurons provided information about which object was being seen,
independently of the view. The coding scheme was shown to be sparse
distributed, with relatively independent information being provided by the
different neurons. Hypotheses about how these view-invariant cells are
formed are described.
View-invariant representations of familiar objects by neurons in the inferior temporal visual cortex
Department of Experimental Psychology, University of Oxford, UK.
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