Modeling the Temporal Dynamics of IT Neurons in Visual Search: A Mechanism for Top-Down Selective Attention
Modeling the Temporal Dynamics of IT Neurons in Visual Search: A Mechanism for Top-Down Selective Attention
复制标题
视觉搜索中 IT 神经元的时间动态建模：自上而下选择性注意的机制
DOI：
--
复制
发表时间：
1996
影响因子：
3.2
通讯作者：
E. Niebur
中科院分区：
文献类型：
--
作者：
M. Usher;E. Niebur
我们提出了一个面向对象注意的神经模型，其中各种视觉刺激（形状，颜色，字母等）由相互竞争、相互抑制的细胞集合体代表。该模型对一系列线索和目标刺激的反应模仿了执行视觉搜索任务的猴子的下颞（IT）视觉皮层中的神经反应：在显示刺激期间的增强反应，其衰减但在线索消失后保持高于自发速率。随后，当呈现由目标和几个干扰物组成的显示时，所有刺激驱动的细胞的活动最初被增强。然而，经过一段短时间后，代表线索刺激的细胞组装的活动增强，而干扰物的活动衰减，因为相互竞争和一个小的自上而下的预期输入。该模型与Chelazzi、米勒、邓肯和Desimone（1993 a）最近报道的IT皮层的延迟活动相吻合。我们认为，视觉系统可能利用这种过程在很大程度上与干扰物的数量无关，从而在干扰物中选择预期目标（出现在不确定的位置）。
We propose a neural model for object-oriented attention in which various visual stimuli (shapes, colors, letters, etc.) are represented by competing, mutually inhibitory, cell assemblies. The model's response to a sequence of cue and target stimuli mimics the neural responses in infero temporal (IT) visual cortex of monkeys performing a visual search task: enhanced response during the display of the stimulus, which decays but remains above a spontaneous rate after the cue disappears. When, subsequently, a display consisting of the target and several distractors is presented, the activity of all stimulus-driven cells is initially enhanced. After a short period of time, however, the activity of the cell assembly representing the cue stimulus is enhanced while the activity of the distractors decays because of mutual competition and a small top-down expectational input. The model fits the measured delayed activity in IT-cortex, recently reported by Chelazzi, Miller, Duncan, and Desimone (1993a), and we suggest that such a process, which is largely independent of the number of distractors, may be used by the visual system for selecting an expected target (appearing at an uncertain location) among distractors.
影响因子：
4.1
作者：
VECERA, SP;FARAH, MJ
通讯作者：
FARAH, MJ
DOI：
10.1037/0096-1523.11.5.583
发表时间：
1985-01-01
影响因子：
2.1
作者：
ERIKSEN, CW;YEH, YY
通讯作者：
YEH, YY