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首页> 外文期刊>International journal of psychophysiology: official journal of the International Organization of Psychophysiology >Stimulus type and design influence hemodynamic responses towards visual disgust and fear elicitors.
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Stimulus type and design influence hemodynamic responses towards visual disgust and fear elicitors.

机译：刺激的类型和设计影响血液动力学对视觉厌恶和恐惧诱发者的反应。

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摘要

The question to what extent emotion-related brain activation depends upon the presentation design (block design vs. event-related design) and the stimulus type (scene pictures vs. pictures with facial mimic) has hardly been addressed in previous functional magnetic resonance imaging (fMRI) research. In the present fMRI experiment, 40 right-handed subjects viewed pictures with fear-inducing and disgust-inducing content as well as facial expressions of fear and disgust. Pictures of neutral objects and neutral facial mimic were used as control stimuli. The pictures were presented in a block design for half of the subjects; the other half viewed the same stimuli as singular events in randomized sequence. The participants had been instructed to passively view the pictures. Disgust-evoking scenes provoked activation in the amygdala, the insula and the orbitofrontal cortex (OFC). This applied to the blocked as well as to the event-related design. Fear-relevant scenes were associated with activity in the insula, the OFC and the middle temporal gyri in the event-related design. The presentation in a block design only led to activation in the middle temporal gyri. Facial expressions of disgust and fear did not trigger significant activation neither in the blocked nor event-related design. This surprising outcome may be a result of context and task effects. The face stimuli which were presented together with the more complex scenes in a passive viewing paradigm possibly were not salient enough to trigger emotional processing.
机译：在以前的功能磁共振成像中，几乎没有解决与情感相关的大脑激活在多大程度上取决于演示设计（模块设计与事件相关设计）和刺激类型（场景图片与具有面部模仿的图片）的问题（ fMRI）研究。在当前的fMRI实验中，有40位惯用右手的受试者观看了具有诱发恐惧和厌恶感的内容以及恐惧和厌恶的面部表情的图片。使用中性物体和中性面部模仿物的图片作为对照刺激。图片以方块图的形式展示了一半的对象。另一半按随机顺序观察与奇异事件相同的刺激。已指示参与者被动查看图片。令人反感的场景激发了杏仁核，岛岛和眶额皮质（OFC）的激活。这适用于已阻止以及与事件相关的设计。与事件相关的设计中，与恐惧相关的场景与孤立岛，OFC和颞中回活动有关。块状设计的表现仅导致颞中回的激活。厌恶和恐惧的面部表情在被阻止或与事件相关的设计中均未触发明显的激活。这种令人惊讶的结果可能是上下文和任务效果的结果。在被动观看范例中与更复杂的场景一起呈现的面部刺激可能不够显着，无法触发情感处理。

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