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猴听觉皮层的神经潜伏期支持灵长类动物背侧流超感觉定时优势。

Neural latencies across auditory cortex of macaque support a dorsal stream supramodal timing advantage in primates.

机构信息

Department of Psychology, Vanderbilt University, Nashville, TN 37240, USA.

出版信息

Proc Natl Acad Sci U S A. 2012 Oct 30;109(44):18168-73. doi: 10.1073/pnas.1206387109. Epub 2012 Oct 16.

Abstract

Sensory systems across the brain are specialized for their input, yet some principles of neural organization are conserved across modalities. The pattern of anatomical connections from the primate auditory cortex to the temporal, parietal, and prefrontal lobes suggests a possible division into dorsal and ventral auditory processing streams, with the dorsal stream originating from more caudal areas of the auditory cortex, and the ventral stream originating from more rostral areas. These streams are hypothesized to be analogous to the well-established dorsal and ventral streams of visual processing. In the visual system, the dorsal processing stream shows substantially faster neural response latencies than does the ventral stream. However, the relative timing of putative dorsal and ventral stream processing has yet to be explored in other sensory modalities. Here, we compare distributions of neural response latencies from 10 different areas of macaque auditory cortex, confirmed by individual anatomical reconstructions, to determine whether a similar timing advantage is found for the hypothesized dorsal auditory stream. Across three varieties of auditory stimuli (clicks, noise, and pure tones), we find that latencies increase with hierarchical level, as predicted by anatomical connectivity. Critically, we also find a pronounced timing differential along the caudal-to-rostral axis within the same hierarchical level, with caudal (dorsal stream) latencies being faster than rostral (ventral stream) latencies. This observed timing differential mirrors that found for the dorsal stream of the visual system, suggestive of a common timing advantage for the dorsal stream across sensory modalities.

摘要

大脑中的感觉系统针对其输入进行了专门化,但神经组织的一些原则在不同感觉模态中是保守的。从灵长类听觉皮层到颞叶、顶叶和前额叶的解剖连接模式表明,可能存在背侧和腹侧听觉处理流的划分,其中背侧流源自听觉皮层更靠后的区域,而腹侧流源自更靠前的区域。这些流被假设为类似于视觉处理中已确立的背侧和腹侧流。在视觉系统中,背侧处理流的神经反应潜伏期明显快于腹侧流。然而,其他感觉模态中推测的背侧和腹侧流处理的相对时间尚未得到探索。在这里,我们通过个体解剖重建,比较了来自猕猴听觉皮层的 10 个不同区域的神经反应潜伏期分布,以确定假设的背侧听觉流是否存在类似的时间优势。在三种不同的听觉刺激(点击、噪声和纯音)下,我们发现潜伏期随层次水平的增加而增加,这与解剖连接性的预测一致。至关重要的是,我们还在同一层次水平内发现了沿尾到头轴的明显时间差异,尾侧(背侧流)潜伏期比头侧(腹侧流)潜伏期快。这种观察到的时间差异反映了视觉系统中背侧流的情况,表明在不同感觉模态中背侧流存在共同的时间优势。

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