Oscillatory γ and θ activity during repeated mental manipulations of a visual image
Oscillatory γ and θ activity during repeated mental manipulations of a visual image
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DOI：
10.1016/j.neulet.2007.04.079
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发表时间：
2007-07-11
影响因子：
2.5
通讯作者：
Watanabe, Masataka
中科院分区：
文献类型：
--
作者：
Kawasaki, Masahiro;Watanabe, Masataka
以往的心理操纵研究涉及直接操纵呈现的刺激或维持先前呈现的刺激的图像。在这里，我们研究了连续的维护和操作的视觉刺激和一次转换的表示使用脑电图（EEG）在多阶段顺序操作任务的脑活动差异。该任务要求被试记住一个具有颜色、形状、方向和运动速度四个特征的物体，并对表征的特征进行两次变换。小波分析显示，在两个连续的视觉刺激的心理操作任务期间，在额叶和顶叶区域中引起强烈的伽马带（> 30 Hz）活动。有趣的是，在第二次操作期间，额叶和顶叶区域的伽马活动更强。我们的研究结果表明，连续的心理操作的一次转换表示可能会对额顶叶网络的更高的要求。另一方面，虽然额叶theta活动在整个维护和操作期间得到增强，但在维护一次性操作表示期间的活动高于物理呈现的刺激，这表明额叶区域在维护操作图像中进一步招募。(c)2007爱思唯尔爱尔兰有限公司保留所有权利。
Previous studies on mental manipulation have dealt with direct manipulation of a presented stimulus or a maintained image of a previously presented stimulus. Here, we investigated brain activity differences between successive maintenance and manipulation of the visual stimulus and the once transformed representations using electroencephalography (EEG) in a multi-stage sequential manipulation task. The task required the subjects to memorize a presented object which possessed four features (color, shape, direction and speed of motion) and transform the feature of the representation twice. Wavelet analysis showed strong gamma-band (> 30 Hz) activity elicited in the frontal and parietal regions during two successive mental manipulation tasks of the visual stimulus. Interestingly, gamma activity in the frontal and parietal regions was stronger during the second manipulation. Our results suggest that successive mental manipulations of the once transformed representation may impose higher demand on the fronto-parietal networks. On the other hand, while the frontal theta activity was enhanced throughout maintenance and manipulation periods, the activity during maintenance of one-time manipulated representation was higher than that of the physically presented stimulus, suggesting that the frontal regions are further recruited in maintenance of manipulated images. (c) 2007 Elsevier Ireland Ltd. All rights reserved.