School of Medicine, Washington University, 660 South Euclid Avenue, St. Louis, MO 63110, USA.
Appetite. 2012 Jun;58(3):800-5. doi: 10.1016/j.appet.2012.01.026. Epub 2012 Feb 2.
In this study, we used a validated psychophysical tool, the hedonic general magnitude scale (hedonic gLMS), to examine whether hedonic responsivity after repetitive tasting of a sweet-tasting liquid follows a habituation pattern that is independent of adaptation to the sweet taste at the orosensory level, and whether the pattern of response is different between obese (N=22) and lean (N=32) women. The perceived sweet intensity and hedonic value of a 24% w/v sucrose solution was measured with the gLMS and sucrose preferences with the Monell two-series, forced-choice tracking method. Although women perceived the same intensity of sweetness across trials, obese women responded with a slower rate of habituation to the liking of repetitive sweet-taste orosensory stimulation than did lean women. Therefore, the decreased hedonic response observed in obese women cannot be explained by adaptation processes at the orosensory level or by differential perception of taste intensity or scale bias between the groups. The groups did not differ in the level of sweetness preferred. Because obesity was associated with slower patterns of habituation to the palatability elicited by sweetness in women, this characteristic could contribute to slower satiation rates, prolongation of eating episodes, and excessive food consumption in obese women.
在这项研究中，我们使用了一种经过验证的心理物理工具，即愉悦总幅度量表（hedonic gLMS），来研究在反复品尝甜味液体后，愉悦反应是否遵循一种与味觉水平上对甜味的适应无关的习惯化模式，以及这种反应模式在肥胖（N=22）和瘦（N=32）女性之间是否不同。使用 gLMS 测量 24% w/v 蔗糖溶液的感知甜度和愉悦值，使用 Monell 双系列，强制选择跟踪方法测量蔗糖偏好性。尽管女性在各次试验中感知到的甜度相同，但肥胖女性对重复甜味味觉刺激的喜好的习惯化速度比瘦女性慢。因此，肥胖女性观察到的愉悦反应下降不能用味觉水平上的适应过程或两组之间的味觉强度感知或量表偏差差异来解释。两组在偏好的甜度水平上没有差异。因为肥胖与女性对甜味引起的味觉愉悦的习惯化模式较慢有关，这种特征可能导致饱腹感下降，进食时间延长，以及肥胖女性过度进食。
