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The temporal visual oddball effect is not caused by repetition suppression.

Blake W Saurels1, Kielan Yarrow2, Ottmar V Lipp3

  • 1School of Psychology, The University of Queensland, St Lucia, Australia. blakewsaurels@gmail.com.

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Summary

The temporal oddball effect, where oddball events seem longer, is not solely due to repetition suppression. Even when predictable, longer standard event sequences increase perceived duration for both oddball and standard events.

Keywords:
AnticipationOddballPerceived durationPredictionRepetition suppression

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Human time perception

Background:

  • The oddball paradigm is a common method for studying human time perception.
  • Previous theories suggested the temporal oddball effect, where oddballs seem longer, is driven by repetition suppression of standard stimuli.
  • Repetition suppression posits that neural responses decrease with repeated stimuli, making them seem shorter.

Purpose of the Study:

  • To investigate the underlying mechanisms of the temporal oddball effect.
  • To test the hypothesis that repetition suppression solely drives the perceived duration increase of oddball events.
  • To disentangle the effects of stimulus probability and repetition on time perception.

Main Methods:

  • A modified oddball paradigm was used, controlling for stimulus probability.
  • Participants were informed about the fixed number of standard events before a test event.
  • Different numbers of standard events were tested in separate experimental sessions.
  • The test event was equally likely to be an oddball or a standard stimulus.

Main Results:

  • A positive linear relationship was observed between the number of preceding standard events and the perceived duration of oddball test events.
  • This positive linear relationship was also found for repeat test events.
  • The findings indicate that perceived duration increases with the number of standards, regardless of whether the final event is an oddball or a repeat.

Conclusions:

  • The results challenge the repetition suppression account as the sole driver of the temporal oddball effect.
  • Anticipation and sequential effects, rather than just neural adaptation, likely contribute to the perceived duration of events in the oddball paradigm.
  • Further research is needed to explore alternative explanations for the temporal oddball effect in time perception.