Cognitive Psychology and Ergonomics, University of Twente, Enschede, The Netherlands.
Clin Neurophysiol. 2012 May;123(5):947-59. doi: 10.1016/j.clinph.2011.08.034. Epub 2011 Oct 12.
Determine the influence of transient spatial attention on the processing of intracutaneous electrical stimuli.
Electrical stimuli, a single pulse or five pulses, were presented at the index fingers of the left or right hand. The to-be-attended hand and stimulated finger varied randomly from trial to trial. Participants had to press a foot pedal only when the relevant stimulus, varied between participants, occurred at the attended hand. EEG was measured to extract relevant ERP components.
The N100 and N150 were enhanced for attended as compared to unattended stimuli. The N100, N150, P260, and the P500 were enlarged for five pulse as compared to single pulse stimuli. The P260, which is thought to reflect a call for attention, was enhanced for unattended as compared to attended stimuli. Source analyses indicate that attentional effects on the N100, N150, and P260 may be related to changes in activity in secondary somatosensory areas and the anterior cingulate cortex.
A transient manipulation of spatial attention increases cortical activity induced by attended relative to unattended intracutaneous electrical stimuli, but initially unattended stimuli appear to induce an enhanced orienting effect.
Initially unattended intracutaneous electrical stimuli seem to induce a call for attention.
确定瞬时空间注意对皮内电刺激处理的影响。
将单个脉冲或 5 个脉冲的电刺激施加于左手或右手的食指。待关注的手和受刺激的手指在每次试验中随机变化。只有当相关刺激（在参与者之间变化）发生在受关注的手上时，参与者才需要按下脚踏板。测量脑电图以提取相关 ERP 成分。
与未关注刺激相比，关注刺激增强了 N100 和 N150。与单脉冲刺激相比，5 脉冲刺激增大了 N100、N150、P260 和 P500。被认为反映注意力的 P260 在未关注刺激时比在关注刺激时增强。源分析表明，注意力对 N100、N150 和 P260 的影响可能与次级体感区和前扣带皮层活动的变化有关。
对空间注意的短暂操作增加了与未关注皮内电刺激相比，被关注刺激引起的皮质活动，但最初未关注的刺激似乎会引起增强的定向效应。
最初未关注的皮内电刺激似乎会引起注意力的召唤。
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