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The Journal of Neurophysiology Vol. 82 No. 1 July 1999, pp. 131-142
Copyright ©1999 by the American Physiological Society
Laboratorium voor Neuro- en Psychofysiologie, Faculteit Geneeskunde, Katholieke Universiteit Leuven, B-3000 Leuven, Belgium
Missal, Marcus,
Rufin Vogels,
Chao-Yi Li, and
Guy A. Orban.
Shape Interactions in Macaque Inferior Temporal Neurons. J. Neurophysiol. 82: 131-142, 1999.
Missal et al. observed that the responses of inferior temporal (IT)
neurons to a shape were reduced markedly when this shape partially
overlapped a larger second shape, suggesting that shape interactions
determine IT responses. In the present study, we compared the responses
of IT neurons with combinations of two shapes which did or did not
overlap and studied the effect of the relative and absolute positions
of the two shapes. In a first test, a preferred shape (figure) was
presented at the fixation point while a second, nonpreferred, shape was
displayed either in the background of the figure (overlap) or at one of
four peripheral positions (nonoverlap). Controls consisted of
presentations of either shape in isolation at each of the five
positions. The stimuli were presented during a fixation task. The
responses to these combinations of two shapes were, on average, reduced
compared with those elicited by the preferred shape presented in
isolation. This suppression occurred whether or not the two shapes
overlapped, but the degree of suppression in the overlap and nonoverlap
conditions did not correlate. These interactions were stronger when the
interacting stimulus was located in the contralateral compared with the
ipsilateral hemifield. The position of the interacting stimulus within
a hemifield significantly affected the suppression associated with
combined shapes in some neurons. The strength of the interactions of
the two nonoverlapping shapes depended on the shape of the interacting stimulus in half of the neurons. In a second test, the preferred shape
and interacting stimulus could appear either at the fixation point or
at one eccentric position. Here we found that the suppression was, on
average, strongest when the interacting stimulus, rather than the
preferred shape, was presented at the fixation position. Also, in 40%
of the neurons, the response reduction was similar in overlap and
nonoverlap conditions if effects of stimulus position were taken into
account. In both tests, we also measured the responses to combinations
of a nonpreferred shape and the interacting stimulus and showed that
the response to a combination of two nonpreferred shapes was, in
general, smaller than the response to a combination of the preferred
and nonpreferred shape. Overall the results indicate that stimulus
interactions in the receptive fields of IT neurons can be position and
shape selective; this can contribute to the coding for the
relationships between object parts.
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