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首页> 外文期刊>Journal of vision >A neural pooling rule for attentional selection in human visual cortex
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A neural pooling rule for attentional selection in human visual cortex

机译：人体视觉皮层的注意力选择神经汇总规则

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To characterize sensory and decisional processes enabling attention to enhance behavioral performance, human observers performed contrast discrimination judgments following two types of attentional cues, while cortical activity was measured with fMRI. Four sinusoidal gratings were presented, one in each visual quadrant, at 8 different a??pedestala?? contrasts. Stimuli were shown in two 600-ms intervals separated by a 200-ms blank interval, one of which (randomized across trials) had a near threshold contrast increase across the 2 intervals. After stimulus offset, an arrow at fixation indicated the target location. Observers maintained central fixation and pressed 1 of 2 buttons to indicate the interval with higher contrast. The three non-target locations had different contrasts that remained unchanged across intervals. Half the trials were preceded by a focal attention cue (arrow at fixation indicating target location), and half were preceded by a distributed cue (4 arrows indicating four possible target locations). fMRI response amplitudes were measured in each of several visual cortical areas, separately for each visual quadrant, pedestal contrast, and attentional condition and then combined across quadrants.
机译：为了表征感官和果断过程，使能引起增强行为性能的注意力，人类观察者在两种类型的注意力下进行了对比辨别判断，而用FMRI测量皮质活性。呈现了四个正弦光栅，在每个视觉象限中，在8个不同的a ?? pedestala ??对比。刺激以两种600ms间隔示出，其中一个600 ms间隔，其中一个（跨试验）中的一个（试验）的一个间隔接近阈值对比度增加。在刺激偏移之后，固定处的箭头表示目标位置。观察者维持中央固定，并按下2个按钮的1，以指示具有更高对比度的间隔。三个非目标位置有不同的对比度，它们横跨间隔保持不变。前面试验的一半是焦虑提示（在固定的箭头指示目标位置），并且在分布式提示之前（4个箭头指示四个可能的目标位置）之前。在每个视觉皮质区域中的每一个中测量FMRI响应幅度，分别用于每个视觉象限，基座对比度和注意力条件，然后在跨摩托车中组合。

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