Strauss Gregory P, Frost Katherine H, Lee Bern G, Gold James M
Department of Psychology, Binghamton University.
Department of Psychiatry and Maryland Psychiatric Research Center, University of Maryland School of Medicine.
Clin Psychol Sci. 2017 Mar;5(2):226-238. doi: 10.1177/2167702616674989. Epub 2017 Mar 10.
Prior studies have concluded that schizophrenia patients are not anhedonic because they do not report reduced experience of positive emotion to pleasant stimuli. The current study challenged this view by applying quantitative methods validated in the Evaluative Space Model of emotional experience to test the hypothesis that schizophrenia patients evidence a reduction in the normative "positivity offset" (i.e., the tendency to experience higher levels of positive than negative emotional output when stimulus input is absent or weak). Participants included 76 schizophrenia patients and 60 healthy controls who completed an emotional experience task that required reporting the level of positive emotion, negative emotion, and arousal to photographs. Results indicated that although schizophrenia patients evidenced intact to experience positive emotion at high levels of stimulus input, they displayed a diminished positivity offset. Reductions in the positivity offset may underlie volitional disturbance, limiting approach behaviors toward novel stimuli in neutral environments.
先前的研究得出结论，精神分裂症患者并非快感缺失，因为他们并未报告对愉悦刺激的积极情绪体验减少。本研究通过应用在情绪体验评估空间模型中得到验证的定量方法，对这一观点提出了挑战，以检验以下假设：精神分裂症患者表现出规范性“积极偏移”（即在无刺激输入或刺激输入较弱时，体验到的积极情绪输出水平高于消极情绪输出水平的倾向）的降低。参与者包括76名精神分裂症患者和60名健康对照者，他们完成了一项情绪体验任务，该任务要求报告对照片的积极情绪、消极情绪和唤醒水平。结果表明，尽管精神分裂症患者在高刺激输入水平下表现出完整的体验积极情绪的能力，但他们的积极偏移有所减少。积极偏移的减少可能是意志障碍的基础，限制了在中性环境中对新刺激的趋近行为。
