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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.
Behavioural Processes
|February 10, 2015
Summary
This study reduced bias in a time perception task. Results suggest perceived time is logarithmic, not linear, once bias is removed.
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.
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