Robustness
to two-object images in human visual cortex
Figure W10: Intracranial field
potentials and receptive fields in human temporal cortex
We argue in the text that the main
results (robustness to the presence of a second object in the image) are
unlikely to be accounted for by a small IFP receptive field that is centered
only on the preferred object / object category. While more detailed
measurements of receptive field sizes would be welcome, it seems that most of the
visually selective electrodes responded to objects presented at both positions
(black squares in this scheme). We therefore represent the IFP receptive field
by the gray circle. We emphasize that our study is a far cry from a detailed
mapping of the IFP receptive fields. To our knowledge, there is no detailed
electrophysiological mapping of IFP receptive fields in human temporal cortex
in the literature.
We note in the
text that the IFP receptive field could include the activity of many neurons
with smaller receptive fields (dashed circles in this figure). Many studies
have examined the receptive fields of neurons in the macaque inferior temporal
cortex (and other parts of ventral visual cortex). The receptive field
estimates in ITC vary significantly across studies ranging from ~2 degrees
(e.g. DiCarlo&Maunsell 2003) to several tens of degrees (e.g. Rolls 1991).
Assuming that IFP receptive fields are larger than single-neuron receptive
fields (e.g. Yoshor&Maunsell 2007) and given the wide ranges in the macaque
literature, our coarse estimates seem to be approximately consistent with the
macaque neurophysiology studies.
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