De Pascalis V, Marucci F S, Penna P M, Pessa E
Department of Psychology, University of Rome, La Sapienza, Italy.
Int J Psychophysiol. 1987 Oct;5(3):167-80. doi: 10.1016/0167-8760(87)90003-1.
This study evaluates individual differences in hypnotizability as reflected in waking-state hemispheric engagement during recollection of 3 positively and 3 negatively valenced personal life events. The State-Trait Anxiety Inventory, Maudsley Personality Inventory, Tellegen Absorption Scale and Harvard Group Scale of Hypnotic Susceptibility (Form A) were administered. Electromyogram (EMG) and bilateral electroencephalogram (EEG) activities within the 40-Hz band were recorded during rest and task conditions in 22 high and 21 low hypnotizable women. Self-report rating scores for vividness of visual imagery and emotional feeling of the material recalled were evaluated. The 40-Hz EMG amplitude and both hemisphere 40-Hz EEG densities were obtained. A 40-Hz EEG ratio, as a measure of hemispheric asymmetry, and a hemispheric specificity index were also computed. High hypnotizables showed significantly lower 40-Hz EEG density than low hypnotizables in all experimental conditions. The relationship between lateralization of 40-Hz EEG and emotional processing was moderated by hypnotizability. High hypnotizables, with respect to rest condition, showed an increase of density over both left and right hemispheres during two of the three positive emotional tasks, while they showed a depressed activity over the left and an increased activity over the right during negative emotional tasks. Low hypnotizables, on the other hand, did not exhibit differential hemispheric patterns that could be attributed to different emotional valences. The high group showed greater hemispheric specificity in the predicted direction than the low group. High subjects exhibited greater ratings of absorptive ability and emotional feeling than low subjects. Anxiety and EMG levels did not differ between groups. EMG was dependent on the type of emotion which showed greater activity in the negative emotion condition compared with the positive one.
本研究评估了在回忆3件积极和3件消极的个人生活事件期间，清醒状态下半球参与情况所反映出的个体催眠易感性差异。研究人员施测了状态-特质焦虑量表、莫兹利人格量表、特根吸收量表和哈佛团体催眠易感性量表（A版）。在22名高催眠易感性女性和21名低催眠易感性女性处于休息和任务状态时，记录了肌电图（EMG）和40赫兹频段内的双侧脑电图（EEG）活动。评估了所回忆材料的视觉意象生动性和情感感受的自我报告评分。获得了40赫兹EMG振幅以及两个半球的40赫兹EEG密度。还计算了作为半球不对称测量指标的40赫兹EEG比率以及半球特异性指数。在所有实验条件下，高催眠易感性者的40赫兹EEG密度显著低于低催眠易感性者。40赫兹EEG的偏侧化与情绪加工之间的关系受到催眠易感性的调节。在休息状态下，高催眠易感性者在三项积极情绪任务中的两项期间，左右半球的密度均增加，而在消极情绪任务期间，左半球活动降低，右半球活动增加。另一方面，低催眠易感性者未表现出可归因于不同情绪效价的半球差异模式。高分组在预测方向上比低分组表现出更大的半球特异性。高催眠易感性者比低催眠易感性者表现出更高的吸收能力和情感感受评分。两组之间的焦虑和EMG水平没有差异。EMG取决于情绪类型，消极情绪条件下比积极情绪条件下表现出更大的活动。
