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The Journal of Neuroscience, July 1, 2000, 20(13):5083-5101
Connections between Anterior Inferotemporal Cortex and Superior
Temporal Sulcus Regions in the Macaque Monkey
K. S.
Saleem1, 2,
W.
Suzuki1, 3,
K.
Tanaka1, 4, and
T.
Hashikawa1
1 Riken Brain Science Institute, Wako, Saitama
351-0198, Japan, 2 Brain Science and Life Technology
Research Foundation, Wako, Saitama 351-0198, Japan,
3 Graduate School of Engineering Sciences, Osaka
University, Toyonaka, Osaka 560-0043, Japan, and 4 Core
Research for Evolutional Science and Technology, Japan Science and
Technology Corporation, Wako, Saitama 351-0198, Japan
We examined the connections between the anterior inferotemporal
cortex and the superior temporal sulcus (STS) in the macaque monkey by
injecting Phaseolus vulgaris leucoagglutinin (PHA-L) or
wheat germ agglutinin conjugated to horseradish peroxidase (WGA-HRP) into the dorsoanterior and ventroanterior subdivisions of TE (TEad and TEav, respectively) and observing the labeled terminals and cell bodies in STS. We found a clear dichotomy in the
connections of the rostral part of STS: the injections into TEad
resulted in a dense distribution of labeled terminals and cell bodies
in the upper bank of rostral STS, whereas labeling was confined to the
lower bank and fundus of rostral STS after injections into TEav. The
distribution of labeling in the rostral STS was discontinuous from the
distribution of labeling surrounding the injection sites: the lower
bank of the rostral STS was spared from labeling in the TEad injection
cases, and TEad had only sparse distribution in the TEav injection
cases. These results revise the classical view that the lower bank of
rostral STS is connected with TE, whereas the upper bank of rostral STS
is connected with the parietal, prefrontal, and superior temporal
regions (Seltzer and Pandya, 1978, 1991, 1994). The upper bank of the
rostral STS is called the superior temporal polysensory area (STP),
because it was previously found that neurons there respond to auditory, somatosensory, and visual stimuli. The present results thus suggest that the polymodal representation in STP interacts more with
information processing in TEad than TEav. It is also suggested that the
information processing in the ventral bank of the rostral STS is
distinct from that in TEad, and the former more directly interacts with TEav than TEad.
Key words:
inferotemporal cortex; area TE; superior temporal sulcus; polysensory area; PHA-L; WGA-HRP; laminar organization; macaque
monkey
Copyright © 2000 Society for Neuroscience 0270-6474/00/20135083-19$05.00/0
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