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首页> 外文期刊>The European Journal of Neuroscience >Distracter suppression dominates attentional modulation of responses to multiple stimuli inside the receptive fields of middle temporal neurons
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Distracter suppression dominates attentional modulation of responses to multiple stimuli inside the receptive fields of middle temporal neurons

机译：干扰抑制占据中间时颞神经元接受领域内对多种刺激的响应的预付调查

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Abstract Singlecell studies in macaques have shown that attending to one of two stimuli, positioned inside a visual neuron's receptive field (RF ), modulates the neuron's response to reflect the features of the attended stimulus. Such a modulation has been described as a pushpull effect relative to a reference response: a neuron's response increases when attention is directed to a preferred stimulus, and decreases when attention is directed to a nonpreferred stimulus. It has been further suggested that the response increase when attending to a preferred stimulus is the predominant effect. Here, we show that the observed attentional modulation depends on the reference response. We recorded neuronal responses in motion processing area middle temporal (MT ) of macaques to two moving random dot patterns positioned inside neuronsRF . One pattern always moved in the neuron's antipreferred direction (null pattern), while the other moved in one of 12 directions (tuning pattern). At the beginning of a trial, a cue indicated the location and direction of the target. The animal was required to release a lever when a change in the target direction occurred, and to ignore changes in the distracter. Relative to neurons initial responses to the dual stimuli (when attention was less likely to modulate responses), attending to the tuning pattern did not significantly modulate responses over time. However, attending to the null pattern progressively decreased responses over time. These results were quantitatively described by filter and input gain models, characterising a predominant response suppression relative to a reference response, rather than response enhancement.
机译：摘要在猕猴中的SingleCell研究表明，参加两个刺激之一，位于视觉神经元的接受领域（RF）内，调节神经元的响应，反映出席刺激的特征。这种调制被描述为相对于参考响应的推性效应：当注意力指向优选的刺激时，神经元的响应增加，并且当注意力指向非刺激的刺激时减少。进一步建议，参加优选刺激时的响应增加是主要效应。在这里，我们表明观察到的注意力调制取决于参考响应。我们在MAAQUES的运动处理区域中间时间（MT）中记录了神经元反应，以定位在NeuronsRF内的两个移动随机点图案。一个图案总是在神经元的反流程方向（空图案）中移动，而另一个在12个方向（调谐图案）中的一个中移动。在试验开始时，提示表示目标的位置和方向。当发生目标方向的变化时，需要这些动物释放杠杆，并忽略干扰的变化。相对于神经元对双重刺激的初始反应（当注意力不太可能调节响应时），参加调谐模式并没有显着调节随时间的响应。但是，参加零模式随着时间的推移逐渐减少响应。通过滤波器和输入增益模型定量描述这些结果，其特征是相对于参考响应的主要响应抑制，而不是响应增强。

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