ERP06成分北师大说课.ppt

一块约2米长的绿色地毯上，一只红色的机器狗守着球门，另一侧一只白色的机器狗越过阻挡它的纸杯，渐渐地接近球门。只见白色机器狗灵巧地躲过“守门员”红色机器狗，将球“踢”进了球门。 　　令人惊奇的是，机器狗踢足球的行为是由两名戴着特殊电极帽的学生用“思维”控制的。这是 清华大学医学院神经工程研究所的专家们昨天用他们研制成功的“脑-机接口”系统做的一项有趣的演示。 N2pc Found in 1996 (Eimer, 1996) N2 latency (200-300) Posterior cortex Contralateral to an attended stimulus Visual search/ discrimination Maximum amplitude appears at PO7/PO8 the ERP marker of attentional selection ERP difference waves were computed by subtracting the ERPs waveforms measured from electrodes on ipsilateral hemisphere to the target from those symmetrical electrodes on contralateral hemisphere. (the contralateral waveform for the target was the average of the left-hemisphere electrode when the target was in the right visual field and the right-hemisphere electrode when the target was in the left visual field; the ipsilateral waveform for the target was the average of the left-hemisphere electrode when the target was in the left visual field and the right-hemisphere electrode when the target was in the right visual field). Because the overall energy of the stimuli was bilateral, this subtraction eliminates most ERP components, with N2pc remaining in the difference wave (Luck, 2012). Distractor positivity Found in 2009 (Hickey at al., 2009; JCN) 100ms or after N2pc Posterior cortex Contralateral to an distractor Visual search/ discrimination Maximum amplitude appears at PO7/PO8 Appears to reflect suppression of potentially distracting nontarget items Pd Contralateral decay activity Found in 1999 250 ms-1000ms Posterior cortex Contralateral to attended hemisphere Visual search/ discrimination Maximum amplitude appears at PO7/PO8 Appears to reflect working meory CDA 工作记忆研究发展-CDA * Psychophysiology(2011)， JEAN-FRANCOIS DELVENNE An electrophysiological measure of visual short-term memory capacity within and across hemifields 工作记忆研究发展-CDA特点 * 实验设计 * ERP结果 * * * * * LRP的另一重要用处是可以显示被试反应的正确率。这是由于左右手反应在错误时（该左手而用了右手或该右手而用了左手）记录到的BSP与按任务规定的手反应所得出的LRP方向正好相反，为正值（向下）。第4行图以文字表示反