Effects of hand posture on preparatory control processes and sensory modulations in tactile-spatial attention
Effects of hand posture on preparatory control processes and sensory modulations in tactile-spatial attention
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DOI：
10.1016/j.clinph.2003.10.015
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发表时间：
2004-03-01
影响因子：
4.7
通讯作者：
Harbich, S
中科院分区：
文献类型：
--
作者：
Eimer, M;Forster, B;Harbich, S
目的：事件相关脑电位（ERPs）进行了测量，以调查空间坐标系统参与的控制准备战斗空间定向，并在随后的注意力调制的somatosensory processing.Methods：在每次试验中，视觉precue直接注意到左手或右手，不频繁的触觉目标被检测到。双手被放置在一起或广泛分开。ERPs被记录在线索-目标间隔，并在响应出席和无人值守的触觉non-targets.Results：一个正面的前定向注意负性（ADAN）和后方晚定向注意正性（LDAP）引起的线索-目标间隔对侧的注意力转移的方向。ADAN不受手姿势的影响，但当双手靠近时，LDAP会减弱。N140振幅增强响应触觉刺激出席的手，这种效果更明显时，双手广泛apart.Conclusions：ADAN和LDAP链接到可分离的前，后注意力控制系统，使用坐标系的基础上躯体和外部空间，分别。空间注意对体感刺激处理的影响受身体姿势的变化的影响。显著性：我们的研究结果表明，在外部空间中的身体位置的表征在触觉注意的控制中起着核心作用。(C)2004年国际临床神经生理学联合会。由Elsevier爱尔兰有限公司出版。保留所有权利。
Objective: Event-related brain potentials (ERPs) were measured to investigate spatial coordinate systems involved in the control of preparatory tactile-spatial orienting, and in subsequent attentional modulations of somatosensory processing.Methods: On each trial, a visual precue directed attention to the left or right hand, where infrequent tactile targets had to be detected. Hands were positioned either close together or wide apart. ERPs were recorded in the cue-target interval and in response to attended and unattended tactile non-targets.Results: A frontal anterior directing attention negativity (ADAN) and a posterior late directing attention positivity (LDAP) were elicited in the cue-target interval contralateral to the direction of an attentional shift. The ADAN was unaffected by hand posture, but the LDAP was attenuated when hands were close together. N140 amplitudes were enhanced in response to tactile stimuli presented to the attended hand, and this effect was more pronounced when hands were wide apart.Conclusions: ADAN and LDAP are linked to separable anterior and posterior attentional control systems, which use coordinate systems based on somatotopic and external space, respectively. Effects of spatial attention on somatosensory stimulus processing are affected by variations in body posture.Significance: Our results demonstrate that representations of body locations in external space play a central role in the control of tactile attention. (C) 2004 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.