Tracing sequential waves of rapid visuomotor activation in lateralized readiness potentials
Tracing sequential waves of rapid visuomotor activation in lateralized readiness potentials
复制标题
追踪侧化准备电位中快速视觉运动激活的连续波
DOI：
10.1016/j.neuroscience.2006.11.044
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发表时间：
2007
期刊：
影响因子：
3.3
通讯作者：
Schmidt
中科院分区：
文献类型：
--
作者：
Schmidt
前馈激活过程被广泛认为是至关重要的自动启动的运动反应，而经常性的过程往往被认为是至关重要的视觉意识。在这里，我们使用了一组行为标准来评估人类视觉系统中的快速处理是否会像预期的那样独立于视觉意识工作的前馈系统那样进行。我们测量了侧化准备电位（LRP）的按键反应的颜色目标（“面具”）之前，掩蔽的颜色启动映射到相同或相反的反应，并跟踪运动激活的时间过程作为一个功能的不同的启动和面具的特点。LRP时程显示，最初的运动激活发生在主要方向，时间锁定到主要发作。然后通过面罩信号在线捕获响应激活，此时电机激活时间锁定到面罩并沿面罩方向进行。至关重要的是，启动子早期激活的时间过程与所有面罩特征无关。早期启动效应的这种不变性与不同面具产生的启动视觉意识的巨大差异形成对比。结果表明，引发的颜色刺激的反应是由前馈波激活顺序引起的总理和面具信号迅速旅行足以逃避经常性的过程，导致向后掩蔽。
Feedforward activation processes are widely regarded as crucial for the automatic initiation of motor responses, whereas recurrent processes are often regarded as crucial for visual awareness. Here, we used a set of behavioral criteria to evaluate whether rapid processing in the human visuomotor system proceeds as would be expected of a feedforward system that works independent of visual awareness. We measured lateralized readiness potentials (LRPs) for key-press responses to color targets (“masks”) preceded by masked color primes mapped onto the same or opposite response, and traced the time-course of motor activation as a function of different prime and mask characteristics. LRP time-courses showed that initial motor activation occurred in prime direction and was time-locked to prime onset. Response activation was then captured on-line by the mask signal, with motor activation now time-locked to the mask and proceeding in mask direction. Crucially, the time-course of early activation by the prime was independent of all mask characteristics. This invariance in early priming effects contrasted with large differences in visual awareness for the prime produced by different masks. Results suggest that primed responses to color stimuli are controlled by feedforward waves of activation sequentially elicited by prime and mask signals traveling rapidly enough to escape the recurrent processes leading to backward masking.
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影响因子：
3.7
作者：
Felleman, Daniel J.;Van Essen, David C.
通讯作者：
Van Essen, David C.
DOI：
10.1037/0096-1523.25.4.976
发表时间：
1999-08-01
影响因子：
2.1
作者：
Klotz, W;Neumann, O
通讯作者：
Neumann, O
灵长类视觉系统中的信息处理策略和途径。
DOI：
--
发表时间：
1995
期刊：
影响因子：
--
作者：
D. C. Essen;C. Anderson
通讯作者：
C. Anderson
DOI：
10.1073/pnas.0931489100
发表时间：
2003-05-13
影响因子：
11.1
作者：
Vorberg, D;Mattler, U;Schwarzbach, J
通讯作者：
Schwarzbach, J
DOI：
10.1037/0096-1523.30.3.538
发表时间：
2004-06-01
影响因子：
2.1
作者：
Godijn, R;Theeuwes, J
通讯作者：
Theeuwes, J