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New Variations for Strategy Set-shifting in the Rat

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Striatal dopamine influences the default mode network to affect shifting between object features.

Linh C Dang¹, Aneesh Donde, Cindee Madison

¹University of California, Berkeley, CA, USA. linhdang@berkeley.edu

Journal of Cognitive Neuroscience

|May 30, 2012

Summary

Cognitive flexibility involves shifting between object features and abstract rules. Dopamine modulates object shifts by influencing default mode network activity, but not rule shifts.

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Area of Science:

Neuroscience
Cognitive Psychology

Background:

Cognitive flexibility allows behavior adaptation to environmental changes.
It involves distinct processes for object feature shifts and abstract rule shifts.
Dopamine's role in cognitive flexibility is complex, potentially differing between object and rule shifting.

Purpose of the Study:

Identify brain regions involved in object and rule shifts.
Investigate dopamine's role in modulating these cognitive flexibility processes.

Main Methods:

fMRI and PET imaging in 16 healthy volunteers performing a set-shift task.
PET used 6-[¹⁸F]-fluoro-l-m-tyrosine (FMT) to measure dopamine synthesis capacity.
Task differentiated between shifting object features and abstract rules.

Main Results:

Rule shifts showed no significant brain activation or correlation with dopamine synthesis.
Object shifts deactivated medial PFC and posterior cingulate, activating lateral PFC, parietal areas, and striatum.
Striatal dopamine synthesis negatively correlated with object shift performance and medial PFC deactivation.

Conclusions:

Rule shifts engage distinct neural mechanisms independent of dopamine synthesis.
Dopamine influences object feature shifts by modulating default mode network activity, specifically medial PFC deactivation.