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The Journal of Neuroscience, July 1, 2002, 22(13):5749-5759
Anatomical Evidence of Multimodal Integration in Primate
Striate Cortex
Arnaud
Falchier,
Simon
Clavagnier,
Pascal
Barone, and
Henry
Kennedy
Institut National de la Santé et de la Recherche
Médicale U371, Cerveau et Vision, 69675 Bron Cedex, France
The primary visual cortex (area 17 or V1) is not thought to receive
input from nonvisual extrastriate cortical areas. However, this has yet
to be shown to be the case using sensitive tracers in the part of area
17 subserving the peripheral visual field. Here we show using
retrograde tracers that peripheral area 17 subserving the visual field
at an eccentricity of 10-20° receives projections from the core and
parabelt areas of the auditory cortex as well as from the polysensory
area of the temporal lobe (STP). The relative strength of these
projections was calculated for each injection by computing the
proportions of retrogradely labeled neurons located in the auditory and
STP areas with respect to number of labeled neurons constituting the
established projection from the superior temporal sulci (STS) motion
complex (middle temporal area, medial superior temporal, fundus of the
superior temporal area). In peripheral area V1 the projection
from auditory cortex corresponds to 9.5% of that of the STS motion
complex and STP to 35% of that from the STS motion complex. Compared
to peripheral area 17, central and paracentral area 17 showed
considerably weaker inputs from auditory cortex (0.2-0.8%) but
slightly more from STP cortex (3.5-6.1%). The present results show
that the connectivity of area 17 is eccentricity dependent. Direct
projections from auditory and STP cortex to peripheral area 17 have
important consequences for higher visual functions of area 17, including multimodal integration at early stages of the visual cortical pathway.
Key words:
area 17; area V1; auditory cortex; polysensory
integration; retinotopy; visual pathways; anatomy; monkey
Copyright © 2002 Society for Neuroscience 0270-6474/02/22135749-11$05.00/0
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