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Setting Time of Cement

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Monitoring Cell-autonomous Circadian Clock Rhythms of Gene Expression Using Luciferase Bioluminescence Reporters
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Watching the clock.

J Gregor Fetterman1, Peter R Killeen, Scott Hall

  • 1Indiana University, Purdue University, Indianapolis IN, USA.

Behavioural Processes
|August 25, 2009
PubMed
Summary
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Animals

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Area of Science:

  • Animal behavior
  • Cognitive science
  • Neuroscience

Background:

  • Understanding temporal judgments in animals is crucial for cognitive science.
  • Retrospective timing tasks assess how animals perceive time intervals.
  • Collateral behaviors can influence, or mediate, an animal's performance.

Purpose of the Study:

  • To investigate the role of collateral behaviors in mediating temporal judgments in rats and pigeons.
  • To determine if collateral activity or the passage of time better predicts temporal judgments.

Main Methods:

  • Four rats and four pigeons were trained on retrospective timing tasks.
  • Tasks involved either spatially-differentiated or color-differentiated responses.
  • Collateral behaviors were monitored and statistically analyzed in relation to temporal judgments.

Main Results:

  • All animals exhibited collateral behaviors that could have influenced temporal judgments.
  • Collateral activity significantly mediated temporal judgments in two pigeons on a spatially-differentiated task.
  • For rats, collateral activity was a better predictor of temporal judgments than the passage of time.

Conclusions:

  • Collateral behaviors play a significant role in mediating temporal judgments in rats and pigeons.
  • The type of task (spatial vs. color differentiation) may influence the extent of mediation.
  • Findings suggest that temporal judgments in these species are not solely based on internal timekeeping mechanisms.