Gardner R M, Morrell J A, Watson D N, Sandoval S L
Department of Psychology, University of Southern Colorado, Pueblo 81001.
Percept Mot Skills. 1989 Oct;69(2):595-604. doi: 10.2466/pms.1989.69.2.595.
Body-size estimates by obese and normal-weight subjects were compared using two different procedures with a TV-video methodology. In the continuous method subjects adjusted an image larger or smaller until they judged a correct TV-image had been achieved. In the second procedure the method of constant stimuli was used wherein values corresponding to the point of subjective equality (PSE) and difference threshold (DL) were determined. No differences between obese and normal-weight subjects were obtained with these procedures. On the continuous task subjects slightly underestimated body size and were more accurate on descending trials where they adjusted the size of the image downwards. With the second procedure, an average PSE of -.62% was obtained, with an average DL = 7.27%. Different PSE values were obtained when subjects were judging whether their image was distorted too wide or too thin. Data from the two procedures are compared and ramifications for the study of body size are discussed.
采用电视 - 视频方法，运用两种不同程序对肥胖受试者和正常体重受试者的体型估计进行了比较。在连续法中，受试者将图像调大或调小，直到他们判断已获得正确的电视图像。在第二种程序中，使用了恒定刺激法，确定了与主观相等点（PSE）和差异阈值（DL）相对应的值。通过这些程序未发现肥胖受试者和正常体重受试者之间存在差异。在连续任务中，受试者对体型略有低估，并且在向下调整图像大小的递减试验中更准确。采用第二种程序时，平均PSE为 - 0.62%，平均DL = 7.27%。当受试者判断他们的图像是否扭曲得太宽或太瘦时，获得了不同的PSE值。对两种程序的数据进行了比较，并讨论了体型研究的影响。
