Objective: Early researches found that different heartbeat perceivers have different heartbeat evoked potential (HEP) waves. Two tasks were considered in our experiments to get more details about the differences between good and poor heartbeat perceivers at attention and resting state.
Methods: Thirty channels of electroencephalogram (EEG) were recorded in 22 subjects, who had been subdivided into good and poor heartbeat perceivers by mental tracking task. Principal component analysis (PCA) was applied to remove cardiac field artifact (CFA) from the HEP.
Results: (1) The good heart-beat perceivers showed difference between attention and resting state in the windows from 250 ms to 450 ms after R wave at C3 location and from 100 ms to 300 ms after R wave at C4 location; (2) The difference waveforms between good and poor heartbeat perceivers was a positive waveform at FZ from 220 ms to 340 ms after R wave, which was more significant in attention state.
Conclusion: Attention state had more effect on the HEPs of good heartbeat perceivers than that of poor heartbeat perceivers; and perception ability influenced HEPs more strongly in the attention state than in the resting state.
目的: 早期研究发现心跳感知能力不同的人其心跳诱发脑电位 (heartbeat evoked potential, HEP) 存在差异。本文设计两个实验以对比研究在关注状态和静息状态下, 心跳感知能力强和心跳感知能力弱的人 HEP 的具体差异。
方法: 采集 22 名被试者的30 通道的脑电波, 通过精神跟踪方法将被试者分为心跳感知能力强和感知能力弱两组。 使用主成分分析方法去除掺杂在 HEP 中的心电场伪迹。
结果: (1) 对于心跳感知能力强的被试者, 关注状态和静息状态的 HEP 存在着差异。差异主要体现在C3处心电R波后 250–450 ms 和C4处心电R波后 100–300 ms。 (2) 感知能力强和感知能力弱的被试者的 HEP 差异波主要体现为FZ处心电R波后220–340 ms的一个正波, 在关注状态下: 这种差异更明显。
结论: 关注因素可能更容易影响心跳感知能力强的被试者?在关注状态: 感知能力对 HEP 的影响更为明显。