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首页> 外文期刊>The European Journal of Neuroscience >Heteromodal connections supporting multisensory integration at low levels of cortical processing in the monkey.
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Heteromodal connections supporting multisensory integration at low levels of cortical processing in the monkey.

机译：异模式连接支持在猴子的皮质处理水平较低的情况下进行多感官整合。

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While multisensory integration is thought to occur in higher hierarchical cortical areas, recent studies in man and monkey have revealed plurisensory modulations of activity in areas previously thought to be unimodal. To determine the cortical network involved in multisensory interactions, we performed multiple injections of different retrograde tracers in unimodal auditory (core), somatosensory (1/3b) and visual (V2 and MT) cortical areas of the marmoset. We found three types of heteromodal connections linking unimodal sensory areas. Visuo-somatosensory projections were observed originating from visual areas [probably the ventral and dorsal fundus of the superior temporal area (FSTv and FSTd), and middle temporal crescent (MTc)] toward areas 1/3b. Somatosensory projections to the auditory cortex were present from S2 and the anterior bank of the lateral sulcus. Finally, a visuo-auditory projection arises from an area anterior to the superior temporal sulcus (STS) toward the auditory core. Injections in different sensory regions allow us to define the frontal convexity and the temporal opercular caudal cortex as putative polysensory areas. A quantitative analysis of the laminar distribution of projecting neurons showed that heteromodal connections could be either feedback or feedforward. Taken together, our results provide the anatomical pathway for multisensory integration at low levels of information processing in the primate and argue against a strict hierarchical model.
机译：尽管人们认为多感官整合发生在更高层次的皮质区域，但最近在人和猴中的研究表明，在以前被认为是单峰态的区域中，对活动进行了多感官调制。为了确定参与多感觉相互作用的皮层网络，我们在set猴的单峰听觉（核心），体感（1 / 3b）和视觉（V2和MT）皮层区域多次注射了不同的逆行示踪剂。我们发现了三种连接单峰感觉区域的异峰连接。观察到的视觉感官投影起源于视觉区域[可能是颞上区域（FSTv和FSTd）的腹侧和背侧眼底，以及颞中部新月形（MTc）]朝向区域1 / 3b。 S2和侧沟前岸存在听觉皮层的体感投射。最后，从上颞沟（STS）前方的区域朝向听觉核心出现视觉听觉投影。在不同的感觉区域的注射使我们能够将额叶凸面和颞下oper尾皮质定义为假定的多感觉区域。投影神经元的层流分布的定量分析表明，异质连接可能是反馈或前馈。两者合计，我们的结果提供了在灵长类动物的低水平信息处理中多感官整合的解剖学途径，并反对严格的分层模型。

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