Attention reshapes center-surround receptive field structure in macaque cortical area MT.
Attention reshapes center-surround receptive field structure in macaque cortical area MT.
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DOI：
10.1093/cercor/bhp002
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发表时间：
2009-10
期刊：
影响因子：
--
通讯作者：
Treue S
中科院分区：
文献类型：
--
作者：
Anton-Erxleben K;Stephan VM;Treue S
将空间注意力引导到猕猴内侧颞区（MT）神经元的经典感受野（cRF）内的一个位置，使cRF的中心向被注意的位置移动。在这里，我们研究了空间注意对许多MT神经元中存在的抑制性环绕的影响。两只猴子注意注视点或放置在cRF内部或旁边的2个随机点模式（RDP）中的1个，而第三个RDP（探针）在cRF和周围快速连续地短暂呈现。探针呈现反应被用来计算兴奋性接受野及其抑制环绕的地图。注意系统地重塑接受野轮廓，独立地将中心和周围移向被注意的位置。此外，cRF的大小作为与注意焦点的相对距离的函数而变化：在cRF内的注意力缩小了它，而在cRF旁边的注意力则扩大了它。此外，我们发现环绕抑制和cRF振幅的系统性变化。这种对感受野的中心-环绕结构的非乘法推拉调制优化了在注意焦点处和附近的处理，从而加强了对参与刺激的表征，同时减少了干扰因素的影响。
Directing spatial attention to a location inside the classical receptive field (cRF) of a neuron in macaque medial temporal area (MT) shifts the center of the cRF toward the attended location. Here we investigate the influence of spatial attention on the profile of the inhibitory surround present in many MT neurons. Two monkeys attended to the fixation point or to 1 of 2 random dot patterns (RDPs) placed inside or next to the cRF, whereas a third RDP (the probe) was briefly presented in quick succession across the cRF and surround. The probe presentation responses were used to compute a map of the excitatory receptive field and its inhibitory surround. Attention systematically reshapes the receptive field profile, independently shifting both center and surround toward the attended location. Furthermore, cRF size is changed as a function of relative distance to the attentional focus: attention inside the cRF shrinks it, whereas directing attention next to the cRF expands it. In addition, we find systematic changes in surround inhibition and cRF amplitude. This nonmultiplicative push–pull modulation of the receptive field's center-surround structure optimizes processing at and near the attentional focus to strengthen the representation of the attended stimulus while reducing influences from distractors.
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