Reed Phil
Department of Psychology, Swansea University, Singleton Park, Swansea, SA2 8PP, UK.
Learn Behav. 2011 Mar;39(1):27-35. doi: 10.1007/s13420-010-0003-5.
Binge eating is often associated with stress-induced disruption of typical eating patterns. Three experiments were performed with the aim of developing a potential model for this effect by investigating the effect of presenting response-independent stimuli on rats' lever-pressing for food reinforcement during both fixed-interval (FI) and fixed-ratio (FR) schedules of reinforcement. In Experiment 1, a response-independent brief tone (500-ms, 105-dB, broadband, noisy signal, ranging up to 16 kHz, with spectral peaks at 3 and 500 Hz) disrupted the performance on an FI 60-s schedule. Responding with the response-independent tone was more vigorous than in the absence of the tone. This effect was replicated in Experiment 2 using a within-subject design, but no such effect was noted when a light was employed as a disrupter. In Experiment 3, a 500-ms tone, but not a light, had a similar effect on rats' performance on FR schedules. This tone-induced effect may represent a release from response-inhibition produced by an aversive event. The implications of these results for modeling binge eating are discussed.
暴饮暴食通常与压力导致的典型饮食模式紊乱有关。进行了三项实验，目的是通过研究在固定间隔（FI）和固定比率（FR）强化程序期间呈现与反应无关的刺激对大鼠按压杠杆获取食物强化的影响，来建立这种效应的潜在模型。在实验1中，一个与反应无关的短音（500毫秒，105分贝，宽带，嘈杂信号，频率高达16千赫，频谱峰值在3赫兹和500赫兹）扰乱了FI 60秒程序中的表现。有与反应无关的音调时的反应比没有音调时更强烈。在实验2中使用被试内设计重复了这一效应，但当使用灯光作为干扰物时未观察到这种效应。在实验3中，一个500毫秒的音调，而不是灯光，对大鼠在FR程序中的表现有类似影响。这种音调诱导的效应可能代表了由厌恶事件产生的反应抑制的解除。讨论了这些结果对暴饮暴食建模的意义。
