EXPLORATION OF THE FILLED-TIME ILLUSION WITH AN INTERVAL PRODUCTION TASK

  • Pierre-Luc Gamache
  • Nicolas Bisson
  • Lisa Hawke
  • Marie-Eve Roussel
  • Simon Grondin

Abstract

The filled-duration illusion, or divided time illusion, refers to the fact that intervals filled with one or multiple intervening sensory events are perceived as being longer than undivided intervals of the same physical duration. The range of durations for investigating this illusion is most often restricted to very short durations (less than a second). Two experiments involving temporal production were conducted, in which participants used a finger-tapping method to produce series of .8- to 3-s target intervals (Experiment 1) or 1- to 1.4-s target intervals (Experiment 2). In Experiment 1, the addition of a divider leads to longer productions only in the short-target conditions but to shorter and more precise productions in the long-target conditions. In Experiment 2, the number of dividers varied from 0 to 3. The results showed that the constant error was larger at 1 than at 1.4 s and larger when more dividers were used, which is attributed to an increase in the information processing load.

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