Document Detail

Stimulus range effects in temporal bisection by humans.
MedLine Citation:
PMID:  8901385     Owner:  NLM     Status:  MEDLINE    
Two experiments with human subjects, using short-duration tones as stimuli to be judged, investigated the effect of the range of the stimulus set on temporal bisection performance. In Experiment 1, six groups of subjects were tested on a temporal bisection task, where each stimulus had to be classified as "short" or "long". For three groups, the difference between the longest (L) and shortest (S) durations in the to-be-bisected stimulus set was kept constant at 400 msec, and the L/S ratio was varied over values of 5:1 and 2:1. For three other groups, the L/S ratio was kept constant at 4:1 but the L-S difference varied from 300 to 600 msec. The bisection point (the stimulus value resulting in 50% "long" responses) was located closer to the arithmetic mean of L and S than the geometric mean for all groups except that for which the L/S ratio was 2:1, in which case geometric mean bisection was found. In Experiment 2, stimuli were spaced between L and S either linearly or logarithmically, and the L/S ratio took values of either 2:1 or 19:1. Geometric mean bisection was found in both cases when the L/S ratio was 2:1, but effects of stimulus spacing were found only when the L/S ratio was 19:1. Overall, the results supported a previous conjecture that the L/S ratio used in a bisection task played a critical role in determining the behaviour obtained. A theoretical model of bisection advanced by Wearden (1991) dealt appropriately with bisection point shifts discussed above but encountered difficulties with stimulus spacing effects.
J H Wearden; A Ferrara
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Quarterly journal of experimental psychology. B, Comparative and physiological psychology     Volume:  49     ISSN:  0272-4995     ISO Abbreviation:  Q J Exp Psychol B     Publication Date:  1996 Feb 
Date Detail:
Created Date:  1996-12-31     Completed Date:  1996-12-31     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8107270     Medline TA:  Q J Exp Psychol B     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  24-44     Citation Subset:  IM    
Department of Psychology, Manchester University, U.K.
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MeSH Terms
Discrimination Learning
Pitch Perception*
Time Perception*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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