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Operant Procedures for Assessing Behavioral Flexibility in Rats
Published on: February 15, 2015
Basolateral amygdala lesions abolish orbitofrontal-dependent reversal impairments
Thomas A Stalnaker1, Theresa M Franz, Teghpal Singh
1Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, MD 21201, USA. tstal002@umaryland.edu
Neuron
|April 6, 2007
Summary
Damage to the orbitofrontal cortex (OFC) impairs cognitive flexibility. This study shows that lesions in the basolateral amygdala (ABL) abolish this OFC-induced reversal learning deficit, suggesting OFC influences flexibility via ABL.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Behavioral Neuroscience
Background:
- Orbitofrontal cortex (OFC) damage is linked to reversal learning deficits.
- OFC lesions cause inflexible associative encoding in the basolateral amygdala (ABL).
Purpose of the Study:
- To test if inflexible ABL encoding causes OFC-lesion-induced reversal learning deficits.
- To investigate the causal role of OFC and ABL in cognitive flexibility.
Main Methods:
- Bilateral neurotoxic lesions of OFC, ABL, or both in rats.
- Testing on odor-based go/no-go discrimination tasks with serial reversals.
Main Results:
- OFC lesions impaired reversal learning compared to controls.
- Combined OFC and ABL lesions abolished the reversal learning impairment.
- ABL lesions alone did not affect reversal learning.
Conclusions:
- OFC facilitates cognitive flexibility by modulating associative encoding in downstream areas like ABL.
- The findings support a model where OFC influences behavioral flexibility through its regulation of ABL function.
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