A multisensory zone in rat parietotemporal cortex:: Intra- and extracellular physiology and thalamocortical connections

被引:76
作者
Brett-Green, B
Fifková, E
Larue, DT
Winer, JA
Barth, DS
机构
[1] Univ Colorado, Dept Psychol, Boulder, CO 80309 USA
[2] Univ Calif Berkeley, Dept Mol & Cell Biol, Berkeley, CA 94720 USA
关键词
mapping; evoked potentials; multimodal; polysensory;
D O I
10.1002/cne.10637
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Multisensory integration is essential for the expression of complex behaviors in humans and animals. However, few studies have investigated the neural sites where multisensory integration may occur. Therefore, we used electrophysiology and retrograde labeling to study a region of the rat parietotemporal cortex that responds uniquely to auditory and somatosensory multisensory stimulation. This multisensory responsiveness suggests a functional organization resembling multisensory association cortex in cats and primates. Extracellular multielectrode surface mapping defined a region between auditory and somatosensory cortex where responses to combined auditory/somatosensory stimulation were larger in amplitude and earlier in latency than responses to either stimulus alone. Moreover, multisensory responses were nonlinear and differed from the summed unimodal responses. Intracellular recording found almost exclusively multisensory cells that responded to both unisensory and multisensory stimulation with excitatory postsynaptic potentials (EPSPs) and/or action potentials, conclusively defining a multisensory zone (MZ). In addition, intracellular responses were similar to extracellular recordings, with larger and earlier EPSPs evoked by multisensory stimulation, and interactions suggesting nonlinear postsynaptic summation to combined stimuli. Thalamic input to MZ from unimodal auditory and somatosensory thalamic relay nuclei and from multisensory thalamic regions support the idea that parallel thalamocortical projections may drive multisensory functions as strongly as corticocortical projections. Whereas the MZ integrates uni- and multisensory thalamocortical afferent streams, it may ultimately influence brainstem multisensory structures such as the superior colliculus. J. Comp. Neurol. 460:223-237, 2003. (C) 2003 Wiley-Liss, Inc.
引用
收藏
页码:223 / 237
页数:15
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