Wedell D H
Department of Psychology, University of South Carolina, Columbia 29208, USA.
J Exp Psychol Hum Percept Perform. 1996 Jun;22(3):634-61. doi: 10.1037//0096-1523.22.3.634.
Conditions under which pairwise dissimilarity ratings should reflect manipulations of the stimulus distribution were outlined by a model that proposed these effects. These conditions arise from either a context dependent process for constructing implicit scale values or a process that uses previously established stimulus-response associates. Consistent with the model, results from 3 experiments using unidimensional psychophysical stimuli demonstrated disordinal context effects on pairwise dissimilarity ratings when (a) there was a 3-s delay between presentation of pair members or (b) a unidimensional rating task preceded the pairwise dissimilarity ratings. Global effects of density were fit well by a model that extended A. Parducci's (1983) range-frequency theory to dissimilarity ratings. Local density effects were generally consistent with predictions from C.L.Krumhansl's (1978) distance-density theory.
一个提出这些效应的模型概述了成对差异评级应反映刺激分布操纵的条件。这些条件源于构建隐式标度值的上下文相关过程，或者使用先前建立的刺激-反应关联的过程。与该模型一致，使用单维心理物理刺激的3个实验结果表明，当成对成员呈现之间存在3秒延迟或（b）单维评级任务先于成对差异评级时，成对差异评级会出现无序的上下文效应。密度的全局效应通过一个将A. Parducci（1983）的范围-频率理论扩展到差异评级的模型得到了很好的拟合。局部密度效应通常与C.L. Krumhansl（1978）的距离-密度理论的预测一致。
