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首页> 外文期刊>Journal of vision >Distracter filtering across the visual thalamocortical network
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Distracter filtering across the visual thalamocortical network

机译：在视觉上堆积网络中进行干扰过滤

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One function of visual attention is to filter out distracting objects. Currently, there is evidence for operations of distracter filtering in areas of the ventral visual stream such as V4 (de Weerd et al., 1999, Nat Neurosci). However, little is known about distracter filtering and its neural mechanisms in other parts of the visual system. We explored distracter filtering in V4, the lateral intraparietal area (LIP) of the dorsal visual stream, and the pulvinar nucleus of the visual thalamus, which has been implicated in distracter filtering from lesion studies (Snow et al., 2009, PNAS; Desimone et al., 1990, CSH Symp Quant Biol). We simultaneously recorded single-neuron activity from these areas of two macaque monkeys performing a variant of the Eriksen flanker task (Eriksen, 1995, Vis Cogn). Macaques were trained to detect a target shape (barrel /bowtie) that was flanked by either congruent distracters (same shape as the target) or incongruent distracters (dissimilar shape to the target). Similar to human behavioral performance, reaction times were faster on congruent versus incongruent trials. We calculated spike density functions for all cells and compared their responses to the target when flanked by congruent versus incongruent distracters. Neurons in V4, LIP, and the pulvinar showed shape selectivity, with more cells showing preference for convex over concave shapes, as previously shown in V4 (Pasupathy and Connor, 1999, J Neurophysiol). When the monkeys correctly identified the target amid distracters, cells were sensitive to the incongruence of nearby distracting stimuli. This sensitivity was seen in both dorsal and ventral visual streams, as well as in the thalamus. These preliminary results suggest that an extensive visual thalamocortical network contributes to distracter filtering, beyond what has been previously shown in the ventral visual stream. The involvement of the pulvinar further supports its important role in visual attention.
机译：视觉关注的一种功能是滤除分散注意力的物体。目前，有证据表明在腹侧视觉流的区域，如V4（De Weerd等，1999，Nat Neurosci）。然而，很少有关于在视觉系统的其他部分中的被带有滤波和其神经机制。我们在V4中探讨了v4，背侧视觉流的横向血管区域（唇部），以及视觉丘脑的脉冲核，这与病变研究中的细致滤波（Snow等，2009，PNA; Desimone等，1990，CSH Symp量子Biol）。我们同时记录了从执行Eriksen Flanker任务的变种（Eriksen，1995，VIGN）的猕猴桃的这些区域的单神经元活动。训练猕猴被训练，以检测由一致性的干扰（作为目标相同的形状）或不一致的干扰物（目标的异常形状）侧翼的目标形状（桶/蝴蝶结）。与人类行为表现相似，在一致与不一致的试验中的反应时间更快。我们计算所有细胞的尖峰密度函数，并将其对目标的响应进行比较，当相对于不一致的干扰因素相比，它们侧翼。在V4，唇缘和脉冲中的神经元显示形状选择性，具有更多细胞，显示出对凹凸形状的偏好，如前面所示的v4（血卡病和康纳，1999，J neurophysiol）。当猴子正确识别目标时，细胞对附近分散注意力的刺激的不协调敏感。在背部和腹侧视觉溪流以及丘脑中看到这种敏感性。这些初步结果表明，广泛的视觉堆积线系导致网络有助于进行分化滤波，超出先前在腹侧视觉流中所示的内容。 Pulvinar的参与进一步支持其在视觉关注中的重要作用。

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