Attention directed by expectations enhances receptive fields in cortical area MT.
Attention directed by expectations enhances receptive fields in cortical area MT.
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DOI：
10.1016/j.visres.2009.10.003
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发表时间：
2010-02-22
期刊：
影响因子：
1.8
通讯作者：
Bearl, David W.
中科院分区：
文献类型：
--
作者：
Ghose, Geoffrey M.;Bearl, David W.
期望，特别是在广泛训练的基础上形成的期望，可以大大提高视觉表现。然而，尚不清楚这种增强的生理机制是否与那些由明确指示而不是强烈期望引导注意力的实验所检验的机制相同。为了研究与强烈期望相关的视觉表征的变化，我们训练动物检测嵌入在噪音中的短暂运动脉冲。因为脉搏的性质和它的外观的统计数据对动物来说是众所周知的，它们形成了强烈的期望，这决定了它们的行为表现。我们使用白噪声方法来推断MT区单个神经元在执行此任务时的感受野结构。结合非线性，我们比较了动物期待运动脉冲时和不期待运动脉冲时的感受野。我们发现感受野的变化与信号脉冲发生的可靠性增加一致。此外，这些变化与简单的增益调制不一致。结果表明，强烈的期望可以在细胞水平上产生非常具体的视觉表现变化，以提高表现。
Expectations, especially those formed on the basis of extensive training, can substantially enhance visual performance. However, it is not clear that the physiological mechanisms underlying this enhancement are identical to those examined by experiments in which attention is directed by explicit instructions rather than strong expectations. To study the changes in visual representations associated with strong expectations, we trained animals to detect a brief motion pulse that was embedded in noise. Because the nature of the pulse and the statistics of its appearance were well known to the animals, they formed strong expectations which determined their behavioral performance. We used white-noise methods to infer the receptive field structure of single neurons in area MT while they were performing this task. Incorporating non-linearities, we compared receptive fields during periods of time when the animals were expecting the motion pulse with periods of time when they were not. We found receptive field changes consistent with an increased reliability in signaling pulse occurrence. Moreover, these changes were not consistent with a simple gain modulation. The results suggest that strong expectations can create very specific changes in the visual representations at a cellular level to enhance performance.
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影响因子：
2.5
作者：
Boudreau, C. Elizabeth;Williford, Tori H.;Maunsell, John H. R.
通讯作者：
Maunsell, John H. R.
影响因子：
2.5
作者：
DEANGELIS, GC;OHZAWA, I;FREEMAN, RD
通讯作者：
FREEMAN, RD
影响因子：
1.9
作者：
Britten, KH;Newsome, WT;Movshon, JA
通讯作者：
Movshon, JA
影响因子：
1.8
作者：
Eckstein, Miguel P.;Shimozaki, Steven S.;Abbey, Craig K.
通讯作者：
Abbey, Craig K.
DOI：
10.1037/0096-1523.14.2.188
发表时间：
1988-05-01
影响因子：
2.1
作者：
DOWNING, CJ
通讯作者：
DOWNING, CJ