知觉学习过程中的外源性和内源性注意力对训练后目标阈值有不同影响。
Exogenous and endogenous attention during perceptual learning differentially affect post-training target thresholds.
作者信息
Mukai Ikuko, Bahadur Kandy, Kesavabhotla Kartik, Ungerleider Leslie G
机构信息
Laboratory of Brain and Cognition, National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892-1366, USA.
出版信息
J Vis. 2011 Jan 31;11(1):10.1167/11.1.25 25. doi: 10.1167/11.1.25.
There is conflicting evidence in the literature regarding the role played by attention in perceptual learning. To further examine this issue, we independently manipulated exogenous and endogenous attention and measured the rate of perceptual learning of oriented Gabor patches presented in different quadrants of the visual field. In this way, we could track learning at attended, divided-attended, and unattended locations. We also measured contrast thresholds of the Gabor patches before and after training. Our results showed that, for both exogenous and endogenous attention, accuracy in performing the orientation discrimination improved to a greater extent at attended than at unattended locations. Importantly, however, only exogenous attention resulted in improved contrast thresholds. These findings suggest that both exogenous and endogenous attention facilitate perceptual learning, but that these two types of attention may be mediated by different neural mechanisms.
关于注意力在知觉学习中所起的作用，文献中的证据相互矛盾。为了进一步研究这个问题，我们分别对外源性和内源性注意力进行了操控，并测量了呈现于视野不同象限的定向Gabor斑块的知觉学习速率。通过这种方式，我们能够追踪在被关注、分散关注和未被关注位置的学习情况。我们还测量了训练前后Gabor斑块的对比度阈值。我们的结果表明，对于外源性和内源性注意力而言，在被关注位置执行方向辨别任务的准确性比在未被关注位置有更大程度的提高。然而，重要的是，只有外源性注意力导致对比度阈值得到改善。这些发现表明，外源性和内源性注意力都有助于知觉学习，但这两种注意力可能由不同的神经机制介导。
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