Electrocortical and electrodermal responses covary as a function of emotional arousal: A single-trial analysis
Electrocortical and electrodermal responses covary as a function of emotional arousal: A single-trial analysis
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DOI：
10.1111/j.1469-8986.2008.00667.x
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发表时间：
2008-07-01
期刊：
影响因子：
3.7
通讯作者：
Lang, Peter J.
中科院分区：
文献类型：
--
作者：
Keil, Andreas;Smith, J. Carson;Lang, Peter J.
人类视觉感知的电生理学研究通常涉及在实验会话期间随时间分布的试验的平均值。使用振荡演示文稿，其中情感或中性的图片，提出了6秒，闪烁和关闭的速率为10 Hz，本研究探讨了单一的审判稳态视觉诱发电位。移动窗口平均和随后的傅立叶分析在刺激频率产生的频谱幅度措施的皮层电活动。跨电极的克朗巴赫α值达到> 0.79。单次试验皮层电激活显着相关的情感图片观看过程中记录的皮肤电导反应的大小。这些结果表明，个体试验的稳态电位可能会产生可靠的指标，在视觉皮层的皮层电活动，这些指标的幅度调制与情绪的参与。
Electrophysiological studies of human visual perception typically involve averaging across trials distributed over time during an experimental session. Using an oscillatory presentation, in which affective or neutral pictures were presented for 6 s, flickering on and off at a rate of 10 Hz, the present study examined single trials of steady-state visual evoked potentials. Moving window averaging and subsequent Fourier analysis at the stimulation frequency yielded spectral amplitude measures of electrocortical activity. Cronbach's alpha reached values >.79, across electrodes. Single-trial electrocortical activation was significantly related to the size of the skin conductance response recorded during affective picture viewing. These results suggest that individual trials of steady-state potentials may yield reliable indices of electrocortical activity in visual cortex and that amplitude modulation of these indices varies with emotional engagement.