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 Previous Article
The Journal of Neuroscience, January 1, 2000, 20(1):495-510
Spatial and Temporal Structure of Receptive Fields in Primate
Somatosensory Area 3b: Effects of Stimulus Scanning Direction and
Orientation
James J.
DiCarlo and
Kenneth O.
Johnson
Krieger Mind/Brain Institute, Departments of Neuroscience and
Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland
21218
This is the third in a series of studies of the neural
representation of tactile spatial form in somatosensory cortical area 3b of the alert monkey. We previously studied the spatial structure of
>350 fingerpad receptive fields (RFs) with random-dot patterns scanned
in one direction (DiCarlo et al., 1998) and at varying velocities
(DiCarlo and Johnson, 1999). Those studies showed that area 3b RFs have
a wide range of spatial structures that are virtually unaffected by
changes in scanning velocity. In this study, 62 area 3b neurons were
studied with three to eight scanning directions (58 with four or more
directions). The data from all three studies are described accurately
by an RF model with three components: (1) a single, central
excitatory region of short duration, (2) one or more inhibitory
regions, also of short duration, that are adjacent to and nearly
synchronous with the excitation, and (3) a region of inhibition that
overlaps the excitation partially or totally and is temporally delayed
with respect to the first two components. The mean correlation between
the observed RFs and the RFs predicted by this three-component model
was 0.81. The three-component RFs also predicted orientation
sensitivity and preferred orientation to a scanned bar accurately. The
orientation sensitivity was determined most strongly by the intensity
of the coincident RF inhibition in relation to the excitation. Both
orientation sensitivity and this ratio were stronger in the
supragranular and infragranular layers than in layer IV.
Key words:
receptive field; reverse correlation; somatosensory; monkey; cortex; cortical layer; orientation sensitivity
Copyright © 2000 Society for Neuroscience 0270-6474/0/201495-16$05.00/0
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