Top-down modulation of shape and roughness discrimination in active touch by covert attention
Top-down modulation of shape and roughness discrimination in active touch by covert attention
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DOI：
10.3758/s13414-018-1625-5
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发表时间：
2019-02-01
影响因子：
1.7
通讯作者：
Drewing, Knut
中科院分区：
文献类型：
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作者：
Metzger, Anna;Mueller, Stefanie;Drewing, Knut
由于感知处理的限制，与瞬时任务目标相关的信息是通过自上而下的机制（例如注意力）从大量可用的感官信息中选择的，这可以提高感知性能。我们研究了隐性注意力如何影响主动触摸中对 3D 物体的感知。在我们的实验中，参与者同时依次探索两个物体的形状和粗糙度，然后被告知要比较两个物体的两个特征之一。为了将隐蔽注意力的焦点引向不同的特征，我们通过改变每项任务的试验频率（20%、50%、80%）来操纵形状或粗糙度判断的期望，然后我们测量辨别阈值。我们发现，与预期任务（或同等预期两项任务）的条件相比，当任务是意外时，形状和粗糙度感知的辨别阈值更高。我们的结果表明主动触摸感知是由对任务的期望来调节的。这意味着，尽管存在根本差异，主动触摸和被动触摸都会以类似的方式受到特征选择性隐蔽注意的影响。
Due to limitations in perceptual processing, information relevant to momentary task goals is selected from the vast amount of available sensory information by top-down mechanisms (e.g. attention) that can increase perceptual performance. We investigated how covert attention affects perception of 3D objects in active touch. In our experiment, participants simultaneously explored the shape and roughness of two objects in sequence, and were told afterwards to compare the two objects with regard to one of the two features. To direct the focus of covert attention to the different features we manipulated the expectation of a shape or roughness judgment by varying the frequency of trials for each task (20%, 50%, 80%), then we measured discrimination thresholds. We found higher discrimination thresholds for both shape and roughness perception when the task was unexpected, compared to the conditions in which the task was expected (or both tasks were expected equally). Our results suggest that active touch perception is modulated by expectations about the task. This implies that despite fundamental differences, active and passive touch are affected by feature selective covert attention in a similar way.