Accession Number : ADA189784

Title :   On Categorizing Sounds.

Descriptive Note : Final technical rept. 1 Aug 85-31 Jul 87,

Corporate Author : DUKE UNIV DURHAM NC DEPT OF PSYCHOLOGY

Personal Author(s) : Lockhead, Gregory R

PDF Url : ADA189784

Report Date : 17 Nov 1987

Pagination or Media Count : 19

Abstract : Judgements of sounds depend on context. How a sound is labeled depends on the sounds that just occurred (sequence effects) and the sounds that might occur (set effects or range effects). These dependencies are sufficiently large that they sometimes predict performance better that the stimulus itself. This report summarizes studies of context conducted during two years of AFOSR support. These studies of sound classification evaluated features of a memory model constructed to account for univariate judgments. The data show how response variability depends on stimulus variability, and demonstrate the importance of experimental details such as whether feedback is given and whether an identification function is present. It is concluded that three variables are needed to describe the collection of results. These are the stimulus itself, the stimulus or response (depending on feedback) on the just prior trial, the stimulus or response (depending on feedback) on the just prior trial, and an average (called a memory pool) of the stimuli on each of several earlier trials.

Descriptors :   *CLASSIFICATION, *PSYCHOACOUSTICS, *JUDGEMENT(PSYCHOLOGY), COLLECTION, IDENTIFICATION, MODELS, RESPONSE, SEQUENCES, SOUND, STIMULI, VARIABLES, VARIATIONS, MEMORY(PSYCHOLOGY), SEQUENTIAL ANALYSIS

Subject Categories : Psychology
      Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE