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Speeding up and (…relatively…) slowing down an internal clock in humans.

J H Wearden1, K Philpott1, T Win1

  • 1Department of Psychology, University of Manchester, Oxford Road, Manchester M13 9PL, UK.

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Click-trains altered perceived time by manipulating the internal clock

Keywords:
BisectionHumansInternal clockPacemaker speedPair-comparisonTime perception

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Area of Science:

  • Psychology
  • Cognitive Science
  • Neuroscience

Background:

  • The internal clock model proposes a pacemaker mechanism for time perception.
  • Previous research suggests external stimuli can modulate this internal clock.

Purpose of the Study:

  • To investigate if click-trains can alter the subjective duration of stimuli.
  • To provide evidence for the relative speeding up and slowing down of the internal clock's pacemaker.

Main Methods:

  • Experiment 1: Used a pair comparison procedure with tones of equal duration, preceded or not by click-trains.
  • Experiment 2: Employed a bisection method using standard tones (200 and 800 ms) and comparison stimuli, with click-train manipulations.

Main Results:

  • Experiment 1 showed that click-trains shifted duration judgments in both directions, supporting pacemaker modulation.
  • Experiment 2's psychophysical functions shifted oppositely based on click-train placement, indicating flexible pacemaker control.

Conclusions:

  • Click-trains effectively manipulate subjective time perception by altering the internal clock's pacemaker speed.
  • These findings support the hypothesized internal clock model and its pacemaker mechanism.