Influence of rhythmic grouping on duration perception: a novel auditory illusion

PLoS One. 2013;8(1):e54273. doi: 10.1371/journal.pone.0054273. Epub 2013 Jan 18.

Abstract

This study investigated a potential auditory illusion in duration perception induced by rhythmic temporal contexts. Listeners with or without musical training performed a duration discrimination task for a silent period in a rhythmic auditory sequence. The critical temporal interval was presented either within a perceptual group or between two perceptual groups. We report the just-noticeable difference (difference limen, DL) for temporal intervals and the point of subjective equality (PSE) derived from individual psychometric functions based on performance of a two-alternative forced choice task. In musically untrained individuals, equal temporal intervals were perceived as significantly longer when presented between perceptual groups than within a perceptual group (109.25% versus 102.5% of the standard duration). Only the perceived duration of the between-group interval was significantly longer than its objective duration. Musically trained individuals did not show this effect. However, in both musically trained and untrained individuals, the relative difference limens for discriminating the comparison interval from the standard interval were larger in the between-groups condition than in the within-group condition (7.3% vs. 5.6% of the standard duration). Thus, rhythmic grouping affected sensitivity to duration changes in all listeners, with duration differences being harder to detect at boundaries of rhythm groups than within rhythm groups. Our results show for the first time that temporal Gestalt induces auditory duration illusions in typical listeners, but that musical experts are not susceptible to this effect of rhythmic grouping.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acoustic Stimulation
  • Adult
  • Auditory Perception / physiology*
  • Auditory Threshold
  • Female
  • Humans
  • Illusions / physiology*
  • Male
  • Music*
  • Periodicity
  • Pitch Discrimination / physiology*
  • Time Factors
  • Young Adult

Grant support

This research was supported by a grant from the Ellison Medical Foundation. During the preparation of this manuscript EG was supported by the Swiss National Science Foundation (PA00P1_131448/1) and the McGovern Institute at Massachusetts Institute of Technology. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.