Schulz André, Lass-Hennemann Johanna, Richter Steffen, Römer Sonja, Blumenthal Terry D, Schächinger Hartmut
Division of Clinical Physiology, Institute of Psychobiology, University of Trier, Johanniterufer 15, D-54290 Trier, Germany.
Biol Psychol. 2009 Mar;80(3):287-91. doi: 10.1016/j.biopsycho.2008.10.006. Epub 2008 Oct 30.
Cardiac modulation of startle eye blink has been introduced as a methodology to reflect baro-afferent signal transmission. Recent studies showed that affective startle modulation is specific to left-ear presentation that may be due to hemispheric specificity in processing emotional-relevant stimuli, similar to the processing of visceral- and baro-afferent stimuli. To explore whether cardiac modulation of startle eye blink is lateralized as well, 37 healthy volunteers received 160 unilateral acoustic startle probes of 105 dB(A) intensity presented to both ears, one at a time. They were elicited 0, 100, 230, and 530 ms after the R-wave of the cardiac cycle. Startle response magnitude was significantly diminished at a latency of 230 ms, which may be due to the baro-afferent neural feedback at this temporal location, but only for left-ear presentation. This lateralization effect in the cardiac modulation of startle eye blink may reflect the previously described advantages of right-hemispheric brain structures in relaying viscero- and baro-afferent signal transmission.
惊吓眨眼的心脏调制已被引入作为一种反映压力传入信号传递的方法。最近的研究表明，情感惊吓调制对左耳呈现具有特异性，这可能是由于在处理与情绪相关的刺激时存在半球特异性，类似于对内脏和压力传入刺激的处理。为了探究惊吓眨眼的心脏调制是否也存在偏侧化，37名健康志愿者接受了160次单侧听觉惊吓探针刺激，强度为105 dB(A)，每次向一只耳朵呈现一个刺激。刺激在心动周期的R波后0、100、230和530毫秒引发。惊吓反应幅度在230毫秒的潜伏期显著减小，这可能是由于此时的压力传入神经反馈，但仅针对左耳呈现。惊吓眨眼的心脏调制中的这种偏侧化效应可能反映了先前描述的右半球脑结构在传递内脏和压力传入信号方面的优势。
