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Reducing bias and analyzing variability in the time-left procedure.

R Emmanuel Trujano1, Vladimir Orduña1

  • 1Facultad de Psicología, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico.

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|February 10, 2015
PubMed
Summary
This summary is machine-generated.

This study reduced bias in a time perception task. Results suggest perceived time is logarithmic, not linear, once bias is removed.

Keywords:
BiasLinear timingLogarithmic timingTime-left

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Area of Science:

  • Psychology
  • Neuroscience
  • Behavioral Economics

Background:

  • The time-left procedure assesses time perception but is influenced by response bias.
  • Variability changes with indifference in this procedure are not well understood.

Purpose of the Study:

  • To experimentally reduce bias in the time-left procedure.
  • To compare difference limen (variability) with linear (scalar expectancy theory) and logarithmic (behavioral economics) timing models.

Main Methods:

  • Two groups of rats (n=6 each) performed the time-left procedure.
  • A control group used the standard procedure; a no-bias group used a modified procedure with single responses per trial.

Main Results:

  • Bias was successfully reduced in the no-bias group.
  • Indifference increased linearly with prediction in both groups.
  • Difference limen and Weber ratios decreased with indifference in the control group (linear timing).
  • Difference limen and Weber ratios remained constant with indifference in the no-bias group (logarithmic timing).

Conclusions:

  • The time-left procedure yields results consistent with logarithmic perceived time when bias is experimentally minimized.
  • Bias significantly influences the interpretation of time perception data from this procedure.