情绪面孔加工的大脑功能偏侧化与两半球的相互作用：效价和唤醒度的影响

发布时间：2018-10-23 19:09

【摘要】：目的：探究效价和唤醒度对情绪面孔加工大脑功能偏侧化的影响,以及这种效应如何受到发生在另一侧半球的阈下情绪面孔加工的影响。方法：采用半视野速示术在单侧或双侧同时呈现高兴或恐惧情绪面孔。单侧呈现条件下只在一侧呈现一个阈上面孔作为目标刺激；双侧呈现条件下在一侧呈现一个阈上面孔,同时在另一侧阈下呈现一个面孔。实验采用2(效价：高兴、恐惧)×2(唤醒度：高、低)×2(视野：左、右)×2(刺激呈现条件：单侧、双侧)四因素被试内实验设计,其中,双侧呈现面孔的效价和唤醒度均包含2(一致性：一致,不一致)。实验中被试的任务是对呈现在任意一侧的阈上面孔进行效价判别。结果：(1)当目标面孔呈现在左视野时,在单侧和双侧条件下的反应都明显快于右视野,且单侧呈现的反应要快于双侧呈现；但是,当目标面孔呈现在右视野时,在高唤醒度情况下对高兴面孔的反应快于对恐惧面孔的反应,在低唤醒度情况下对恐惧面孔的反应快于对高兴面孔的反应；当目标面孔为高唤醒度时,对单侧呈现的面孔的加工快于对双侧呈现的面孔的加工。(2)在双侧效价一致条件下,高兴面孔呈现在左视野的反应显著快于右视野,但总体上出现在唤醒度不一致条件下。(3)在双侧唤醒度一致条件下,高唤醒度的高兴面孔在效价一致条件下的反应显著慢于效价不一致条件；在右视野呈现条件下低唤醒度的恐惧面孔的反应快于低唤醒度的高兴面孔。结论：(1)右半球对所有情绪面孔的加工存在优势,并且这种加工优势非常稳定,虽然左半球加工阈下情绪面孔会对右半球加工阈上情绪面孔造成干扰,但是右半球的情绪加工优势依然存在,只有在左半球加工不一致效价的阈下情绪面孔时,右半球的优势效应才消失。(2)对情绪面孔的反应并不单纯因效价的分类而不同,唤醒度会影响对情绪面孔的反应,甚至影响力更大。(3)效价和唤醒度的情绪动机趋势共同影响不同意识水平上两半球对情绪面孔的加工。(4)高唤醒度的无意识恐惧会促进有意识情绪面孔的加工。
[Abstract]:Aim: to investigate the effects of titer and arousal on the lateralization of emotional face processing in the brain and how this effect is affected by subthreshold emotional face processing in the other hemisphere. Methods: half-field visualization was used to present happy or fearful faces on one or both sides. Only one suprathreshold face appears as the target stimulus on one side, and one suprathreshold face on one side and one face under the other side on both sides. Two (titer: happy, fear) 脳 2 (arousal degree: high, low) 脳 2 (field of vision: left, right) 脳 2 (stimulus presentation condition: unilateral, bilateral) were used in the experiment, in which, Both the titer and arousal of the face on both sides include 2 (consistency: consistency, inconsistency). The task of the experiment was to determine the titer of the superior face on either side. Results: (1) when the target face was present in the left visual field, the response of the target face in the unilateral and bilateral visual field was significantly faster than that in the right visual field, and the response of the unilateral face was faster than that of the bilateral visual field, but when the target face was present in the right visual field, In the case of high arousal, the response to the happy face was faster than that to the fear face, and in the case of low arousal, the response to the fear face was faster than to the happy face, and when the target face was high arousal, The processing of the faces presented on one side was faster than that on the two sides. (2) the response of happy faces in the left visual field was significantly faster than that in the right field under the condition of the same titer of both sides. However, under the condition of inconsistent arousal degree, (3) under the condition of the same arousal degree on both sides, the response of the happy face with high arousal degree was significantly slower than that under the condition of inconsistent titer. The response of fear faces with low arousal was faster than that of happy faces with low arousal under the condition of right visual field. Conclusion: (1) the processing advantage of all emotional faces in the right hemisphere is very stable, although the processing of subthreshold emotional faces in the left hemisphere may interfere with the processing of the upper emotional faces in the right hemisphere. However, the emotional processing advantage of the right hemisphere still exists. Only when the left hemisphere processes subthreshold faces with inconsistent titers, the dominant effects of the right hemisphere disappear. (2) the responses to emotional faces do not differ solely from the classification of the titers. Arousal affects the response to emotional faces, (3) the tendency of emotional motivation of titer and arousal degree affects the processing of emotional faces in the two hemispheres at different levels of consciousness. (4) the unconscious fear of high arousal degree promotes the processing of conscious emotional faces.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：B842
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本文编号：2290214