Priming of visual cortex by temporal attention? The effects of temporal predictability on stimulus(-specific) processing in early visual cortical areas
Priming of visual cortex by temporal attention? The effects of temporal predictability on stimulus(-specific) processing in early visual cortical areas
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DOI：
10.1016/j.neuroimage.2012.10.091
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发表时间：
2013-02-01
期刊：
影响因子：
5.7
通讯作者：
Ruge, Hannes
中科院分区：
文献类型：
--
作者：
Fischer, Rico;Plessow, Franziska;Ruge, Hannes
最近的研究表明，预期事件的时间可预测性改变了感知和行动的加工。然而，时间可预测性偏向这种加工的神经机制(S)到目前为止还知之甚少。因此，在目前的fMRI研究中，我们调查了时间可预测性如何影响视觉皮质区域的神经处理。为此，34名参与者在不同的试验组中对性别或垂直或水平移动面孔的移动方向进行了分类。刺激开始的时间可预测性是通过有效预测刺激开始的听觉警报信号的存在或不存在来操纵的。行为数据显示，警报信号的存在对性能有明显的好处。神经成像结果显示，无论当前执行的任务是什么，时间可预测性都会显着降低初级视皮层的激活。这种激活减少与警报信号相关的性能优势相关。此外，我们没有发现时间可预测性的提高对特定材料视觉大脑区域中特定目标视觉处理(人脸或运动)的选择性影响。总而言之，这些发现表明，警报信号增加了非特定任务的准备，这可能会导致刺激代码更有效地传输到反应代码中。(C)2012 Elsevier Inc.保留所有权利。
In recent studies it has been shown that temporal predictability of expected events alters processing in perception and action. Yet, the neural mechanism(s) by which temporal predictability biases this processing is to date little understood. Therefore, in the present fMRI study we investigated how temporal predictability affects neural processing in visual cortical areas. For this, thirty-four participants either categorized the gender or the movement direction of vertically or horizontally moving faces in different blocks of trials. Temporal predictability of stimulus onset was manipulated by the presence or absence of an auditory alerting signal validly predicting stimulus onset. The behavioral data revealed a clear performance benefit for the presence of an alerting signal. Neuroimaging results showed that irrespective of the currently performed task temporal predictability significantly reduced activation in the primary visual cortex. This activation reduction correlated with the alerting signal-related performance benefit. Furthermore, we did not find a selective influence of increased temporal predictability on target-specific visual processing (faces or movement) in the respective material-specific visual brain areas. Together, these findings suggest an increased task-unspecific readiness by the alerting signal that might result in more efficient transmission of stimulus codes into response codes. (C) 2012 Elsevier Inc. All rights reserved.