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When is now? Perception of simultaneity.

J V Stone1, N M Hunkin, J Porrill

  • 1Department of Psychology, University of Sheffield, UK. j.v.stone@sheffield.ac.uk

Proceedings. Biological Sciences
|July 19, 2002
PubMed
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Individual differences in perceiving simultaneous light and sound exist, with each person having a unique point of subjective simultaneity (PSS). This PSS is stable for individuals but affected by stimulus distance.

Area of Science:

  • Psychology
  • Neuroscience
  • Sensory Perception

Background:

  • The perception of simultaneous auditory and visual stimuli is crucial for multisensory integration.
  • Understanding individual differences in sensory processing is key to comprehending human perception.

Purpose of the Study:

  • To investigate if there is a difference in the perception time between auditory and visual stimuli.
  • To determine the stability and influencing factors of the point of subjective simultaneity (PSS).

Main Methods:

  • 1000 trials presenting light-sound pairs with varying stimulus onset asynchrony (SOA).
  • Observers judged simultaneity, determining the point of subjective simultaneity (PSS).
  • Experiment 2 assessed PSS stability and effects of observer-stimulus distance.

Related Experiment Videos

Main Results:

  • Point of subjective simultaneity (PSS) varied between -21 ms and +150 ms, indicating individual differences.
  • Each observer's PSS was found to be stable and highly correlated across different distances (r = 0.954).
  • PSS was significantly affected by observer-stimulus distance, but reaction time differences (RTd) were not observer-specific or stable.

Conclusions:

  • Perception of auditory and visual simultaneity is observer-specific and stable.
  • Observers do not fully compensate for changes in stimulus distance affecting arrival times.
  • Reaction time differences to unimodal stimuli lack individual specificity and stability.