Task-specific, dimension-based attentional shaping of motion processing in monkey area MT.
Task-specific, dimension-based attentional shaping of motion processing in monkey area MT.
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猴区 MT 运动处理的特定任务、基于维度的注意力塑造
DOI：
10.1152/jn.00183.2017
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发表时间：
2017
影响因子：
2.5
通讯作者：
Wegener D
中科院分区：
文献类型：
--
作者：
Schledde B;Galashan FO;Przybyla M;Kreiter AK;Wegener D
非空间选择性注意是基于这样的概念，即视觉环境中的特定特征或物体在皮层视觉处理中被有效地优先化。特别地，基于注意力的注意力（FBA）是一个被充分研究的过程，其动态地和选择性地寻址优先处理被关注的特征属性（例如，运动）。然而，在日常生活中，行为可能需要对整个特征维度的高灵敏度（例如，运动），但缺乏细胞水平上特征维度特定注意力调节的实验证据。因此，我们研究了猕猴运动选择性颞中区（MT）的神经元活动，在实验设置要求猴子检测运动变化或颜色变化。我们假设，在MT的神经活动增强时，任务需要对运动的感知灵敏度。与此相一致，我们发现，尽管视觉刺激相同，但运动任务中的平均放电率较高，并且与颜色任务中的值相比，反应变异性和潜伏期较低。这种特定于任务的，基于维度的调制运动处理已经出现在视觉输入的情况下，是独立的出席和刺激运动方向之间的关系，并伴随着神经元变异性的空间全球减少。结果提供了单细胞支持的假设的一个功能尺寸特定的自上而下的信号强调处理的整个功能class.NEW &值得注意的是皮质处理服务的视觉感知优先信息，根据当前的任务要求。我们提供的证据有利于一个基于维度的注意力机制，解决所有的神经元处理视觉信息的任务相关的功能域。行为任务要求猴子参加颜色或运动，引起调制的反应强度，变异性，延迟，和基线活动的运动选择性猴子区MT神经元，无论出席的运动方向，但具体到出席的功能尺寸。
Nonspatially selective attention is based on the notion that specific features or objects in the visual environment are effectively prioritized in cortical visual processing. Feature-based attention (FBA), in particular, is a well-studied process that dynamically and selectively addresses neurons preferentially processing the attended feature attribute (e.g., leftward motion). In everyday life, however, behavior may require high sensitivity for an entire feature dimension (e.g., motion), but experimental evidence for a feature dimension-specific attentional modulation on a cellular level is lacking. Therefore, we investigated neuronal activity in macaque motion-selective mediotemporal area (MT) in an experimental setting requiring the monkeys to detect either a motion change or a color change. We hypothesized that neural activity in MT is enhanced when the task requires perceptual sensitivity to motion. In line with this, we found that mean firing rates were higher in the motion task and that response variability and latency were lower compared with values in the color task, despite identical visual stimulation. This task-specific, dimension-based modulation of motion processing emerged already in the absence of visual input, was independent of the relation between the attended and stimulating motion direction, and was accompanied by a spatially global reduction of neuronal variability. The results provide single-cell support for the hypothesis of a feature dimension-specific top-down signal emphasizing the processing of an entire feature class.NEW & NOTEWORTHYCortical processing serving visual perception prioritizes information according to current task requirements. We provide evidence in favor of a dimension-based attentional mechanism addressing all neurons that process visual information in the task-relevant feature domain. Behavioral tasks required monkeys to attend either color or motion, causing modulations of response strength, variability, latency, and baseline activity of motion-selective monkey area MT neurons irrespective of the attended motion direction but specific to the attended feature dimension.
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在透明表面感知过程中将注意力分散在形式和运动之间。
DOI：
--
发表时间：
2002
期刊：
Brain research. Cognitive brain research
影响因子：
--
作者：
V. Rodriguez;M. Valdés;W. Freiwald
通讯作者：
W. Freiwald
影响因子：
8.2
作者：
Serences JT;Ester EF;Vogel EK;Awh E
通讯作者：
Awh E
影响因子：
2.5
作者：
MAUNSELL, JHR;VANESSEN, DC
通讯作者：
VANESSEN, DC
影响因子：
1.8
作者：
Gledhill, Daniela;Grimsen, Cathleen;Wegener, Detlef
通讯作者：
Wegener, Detlef
影响因子：
5.3
作者：
A. Thiele;K. Dobkins;T. Albright
通讯作者：
T. Albright