Abstract
It is a well-known fact that the categorical judgment on a stimulus is generally influenced by the context, but systematic studies on quantitative aspects of the context effect are rather few. The present study investigated the influence of the relative positions of the target and context stimuli both on the stimulus continuum and on the time axis. The influence of stimulus attributes was also investigated using pure tones, complex tones with a formant structure, and synthetic vowel sounds. The results indicated the existence of a gradual transition from assimilation to contrast in almost all cases studied, the contrastive effect becoming more intense with increased stimulus complexity in nonspeech stimuli and most intense in speech stimuli. An interpretation of the results is presented on the basis of a model for the process of categorical judgment. [Work supported by Grant-in-Aid for Scientific Research from the Ministry of Education.]
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