Hemispheric asymmetries for temporal information processing: Transient detection versus sustained monitoring
Hemispheric asymmetries for temporal information processing: Transient detection versus sustained monitoring
复制标题
DOI：
10.1016/j.bandc.2007.07.002
复制
发表时间：
2008-03-01
影响因子：
2.5
通讯作者：
Nicholls, Michael E. R.
中科院分区：
文献类型：
--
作者：
Okubo, Matia;Nicholls, Michael E. R.
本研究考察了左半球和右半球(左半球和右半球)在处理视觉时间信息时的功能差异。参与者指出棋盘图案是否包含持续10到40毫秒的时间间隔。当刺激包含时间信号(即间隙)时，对右视野-左半球(RVF-LH)的反应比对左视野-右半球(LVF-RH)的反应更准确。这种RVF-LH的优势在间隔时间较短的情况下更大(实验I和实验2)，这表明LH具有比RH更好的时间分辨率，并且对于瞬时检测是有效的。相比之下，对于噪声试验(即没有时间信号的试验)，存在LVF-RH优势。当整个刺激持续时间较长(240ms，实验1)时，这种LVF-RH优势被观察到，但当刺激持续时间较短(120ms，实验2)时，这种优势被消除。在实验3中，间隙被放置在刺激呈现的末尾，在噪声试验中发现了LVF-RH优势，而在信号试验中则消除了RVF-LH优势。当间隙不存在(即噪声试验)或放置在演示接近尾声时，参与者很可能需要对刺激进行更长时间的监控。因此，RH在持续监测视觉时间信息方面可能更有效，而LH对于瞬变检测更有效。(C)2007 Elsevier Inc.保留所有权利。
This study investigated functional differences in the processing of visual temporal information between the left and right hemispheres (LH and RH). Participants indicated whether or not a checkerboard pattern contained a temporal gap lasting between 10 and 40 ms. When the stimulus contained a temporal signal (i.e. a gap), responses were more accurate for the right visual field-left hemisphere (RVF-LH) than for the left visual field-right hemisphere (LVF-RH). This RVF-LH advantage was larger for the shorter gap durations (Experiments I and 2), suggesting that the LH has finer temporal resolution than the RH, and is efficient for transient detection. In contrast, for noise trials (i.e. trial without temporal signals), there was a LVF-RH advantage. This LVF-RH advantage was observed when the entire stimulus duration was long (240 ms, Experiment 1), but was eliminated when the duration was short (120 ms, Experiment 2). In Experiment 3, where the gap was placed toward the end of the stimulus presentation, a LVF-RH advantage was found for noise trials whereas the RVF-LH advantage was eliminated for signal trials. It is likely that participants needed to monitor the stimulus for a longer period of time when the gap was absent (i.e. noise trials) or was placed toward the end of the presentation. The RH may therefore be more efficient in the sustained monitoring of visual temporal information whereas the LH is more efficient for transient detection. (c) 2007 Elsevier Inc. All rights reserved.