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Related Experiment Videos

Effect of task difficulty on the functional anatomy of temporal processing.

Jason R Tregellas1, Deana B Davalos, Donald C Rojas

  • 1Department of Psychiatry, University of Colorado Health Sciences Center, Campus Box C268-71, 4200 E. 9th Avenue, Denver, CO 80262, USA. Jason.Tregellas@UCHSC.edu

Neuroimage
|April 21, 2006
PubMed
Summary

This study reveals the cerebellum

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Temporal processing is crucial for perception, performance, and cognition.
  • Previous research highlighted the need to understand task difficulty effects on neural activation and the role of the dorsolateral prefrontal cortex (DLPFC) in timing.

Purpose of the Study:

  • To investigate the functional neuroanatomy of temporal discrimination using fMRI.
  • To examine how task difficulty influences neuronal activation during timing.
  • To clarify the involvement of the DLPFC in temporal processing.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.
  • Twenty healthy subjects performed a temporal discrimination task with two difficulty levels.
  • A control condition involved responding to identical tones.

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Main Results:

  • Low difficulty activated the cerebellum and superior temporal gyrus.
  • Increased difficulty led to additional activation in the supplementary motor area, insula/operculum, DLPFC, thalamus, and striatum.
  • DLPFC activation occurred even with minimal working memory load.

Conclusions:

  • The cerebellum is critical for gross temporal discrimination.
  • Frontal and striatal regions are recruited in a load-dependent manner during timing tasks.
  • DLPFC is specifically involved in temporal processing, not general working memory.