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首页> 外文期刊>Journal of Neurophysiology >Edge orientation signals in tactile afferents of macaques
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Edge orientation signals in tactile afferents of macaques

机译：猕猴触觉传入的边缘方向信号

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The orientation of edges indented into the skin has been shown to be encoded in the responses of neurons in primary somatosensory cortex in a manner that draws remarkable analogies to their counterparts in primary visual cortex. According to the classical view, orientation tuning arises from the integration of untuned input from thalamic neurons with aligned but spatially displaced receptive fields (RFs). In a recent microneurography study with human subjects, the precise temporal structure of the responses of individual mechanoreceptive afferents to scanned edges was found to carry information about their orientation. This putative mechanism could in principle contribute to or complement the classical rate-based code for orientation. In the present study, we further examine orientation information carried by mechanoreceptive afferents of Rhesus monkeys. To this end, we record the activity evoked in cutaneous mechanoreceptive afferents when edges are indented into or scanned across the skin. First, we confirm that information about the edge orientation can be extracted from the temporal patterning in afferent responses of monkeys, as is the case in humans. Second, we find that while the coarse temporal profile of the response can be predicted linearly from the layout of the RF, the fine temporal profile cannot. Finally, we show that orientation signals in tactile afferents are often highly dependent on stimulus features other than orientation, which complicates putative decoding strategies. We discuss the challenges associated with establishing a neural code at the somatosensory periphery, where afferents are exquisitely sensitive and nearly deterministic.
机译：缩进皮肤的边缘方向已显示为编码在初级体感皮层的神经元反应中，其方式与初级视觉皮层中的对应物极为相似。根据经典观点，方向调整是由于来自丘脑神经元的未调整输入与对齐但在空间上移位的感受野（RF）的整合而产生的。在最近对人体进行的微神经造影研究中，发现各个机械感受性传入神经对扫描边缘的反应的精确时间结构携带了有关其方向的信息。该推定机制原则上可以有助于或补充经典的基于速率的定向代码。在本研究中，我们进一步检查恒河猴的机械感受传入传入的方向信息。为此，当边缘被压入皮肤或在皮肤上扫描时，我们记录了在皮肤机械感受传入中引起的活动。首先，我们确认可以从猴子的传入响应中的时间模式中提取有关边缘方向的信息，就像人类一样。其次，我们发现虽然可以根据RF的布局线性预测响应的粗略时间分布，但精细时间分布却无法。最后，我们表明触觉传入的方向信号通常高度依赖于方向以外的刺激特征，这使推定解码策略变得复杂。我们讨论与在体感外围建立神经代码相关的挑战，在这些外围传入感觉非常敏感并且几乎是确定性的。

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