Montoya P, Schandry R, Müller A
Institute of Psychology, University of Munich, Germany.
Electroencephalogr Clin Neurophysiol. 1993 May-Jun;88(3):163-72. doi: 10.1016/0168-5597(93)90001-6.
Heartbeat evoked potentials (HEP) were recorded from good and poor heartbeat perceivers under two conditions differing in focus of attention. Under the first condition (ATT), subjects were instructed to count their heartbeats. Under the second condition (DIS), subjects were distracted from their heartbeats by having them count external tones. Electrical brain activity was recorded from 19 electrodes. EEG epochs were triggered by the R wave of the EKG. Analyses of variance yielded a significant difference for focus of attention in HEP amplitudes at central electrodes (Cz, C3, and C4) in the latency range 350-550 msec post R wave. No significant differences occurred between good and poor perceivers. The interaction between the Group and Condition factors was significant at F4, C4 and T6. The potential map of good perceivers showed a fronto-temporal positivity, which was reduced in poor perceivers. Our data suggest that paying attention to an internal event such as the heartbeat can modify the cortical evoked response associated with that event.
在两种注意力焦点不同的条件下，对心跳感知能力强和弱的受试者记录心跳诱发电位（HEP）。在第一种条件（ATT）下，受试者被要求数自己的心跳。在第二种条件（DIS）下，受试者通过数外部声音而分散对自己心跳的注意力。从19个电极记录脑电活动。脑电图片段由心电图的R波触发。方差分析结果显示，在R波后350 - 550毫秒的潜伏期范围内，中央电极（Cz、C3和C4）处的HEP振幅在注意力焦点方面存在显著差异。心跳感知能力强和弱的受试者之间未出现显著差异。组和条件因素之间的交互作用在F4、C4和T6处显著。心跳感知能力强的受试者的电位图显示额颞部为正电位，而在心跳感知能力弱的受试者中该电位降低。我们的数据表明，关注诸如心跳这样的内部事件可以改变与该事件相关的皮层诱发电反应。
