Temporal binding of auditory spatial information across dynamic binaural events

Atten Percept Psychophys. 2018 Jan;80(1):14-20. doi: 10.3758/s13414-017-1436-0.

Abstract

Simultaneity judgments were used to measure temporal binding windows (TBW) for brief binaural events (changes in interaural time and/or level differences [ITD and ILD]) and test the hypothesis that ITD and ILD contribute to perception via separate sensory dimensions subject to binding via slow (100+ ms)-presumably cortical-mechanisms as in multisensory TBW. Stimuli were continuous low-frequency noises that included two brief shifts of either type (ITD or ILD), both of which are heard as lateral position changes. TBW for judgments within a single cue dimension were narrower for ITD (mean = 444 ms) than ILD (807 ms). TBW for judgments across cue dimensions (i.e., one ITD shift and one ILD shift) were similar to within-cue ILD (778 ms). The results contradict the original hypothesis, in that cross-cue comparisons were no slower than within-cue ILD comparisons. Rather, the wide TBW values-consistent with previous estimates of multisensory TBW-suggest slow integrative processing for both types of judgments. Narrower TBW for ITD than ILD judgments suggests important cue-specific differences in the neural mechanisms or the perceptual correlates of integration across binaural-cue dimensions.

Keywords: Audition; Multisensory processing; Spatial localization.

MeSH terms

  • Acoustic Stimulation / methods
  • Adult
  • Cues
  • Female
  • Humans
  • Judgment / physiology*
  • Male
  • Sound Localization / physiology*
  • Spatial Processing / physiology*
  • Young Adult