Lewis P A, Critchley H D, Rotshtein P, Dolan R J
Institute of Cognitive Neuroscience, University College London, London, UK.
Cereb Cortex. 2007 Mar;17(3):742-8. doi: 10.1093/cercor/bhk024. Epub 2006 May 12.
Psychological frameworks conceptualize emotion along 2 dimensions, "valence" and "arousal." Arousal invokes a single axis of intensity increasing from neutral to maximally arousing. Valence can be described variously as a bipolar continuum, as independent positive and negative dimensions, or as hedonic value (distance from neutral). In this study, we used functional magnetic resonance imaging to characterize neural activity correlating with arousal and with distinct models of valence during presentation of affective word stimuli. Our results extend observations in the chemosensory domain suggesting a double dissociation in which subregions of orbitofrontal cortex process valence, whereas amygdala preferentially processes arousal. In addition, our data support the physiological validity of descriptions of valence along independent axes or as absolute distance from neutral but fail to support the validity of descriptions of valence along a bipolar continuum.
心理学框架从“效价”和“唤醒”两个维度对情绪进行概念化。唤醒涉及一个强度单一轴，从中性到最大唤醒程度逐渐增强。效价可以被描述为双极连续体、独立的正性和负性维度，或者享乐价值（与中性的距离）。在本研究中，我们使用功能磁共振成像来表征在呈现情感性词语刺激期间与唤醒以及不同效价模型相关的神经活动。我们的结果扩展了在化学感觉领域的观察结果，提示存在一种双重解离，即眶额皮质的子区域处理效价，而杏仁核优先处理唤醒。此外，我们的数据支持沿着独立轴或作为与中性的绝对距离来描述效价的生理有效性，但不支持沿着双极连续体来描述效价的有效性。
