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Research Paper
Electrolytic lesions of the medial prefrontal cortex do not interfere with long-term memory of extinction of conditioned fear

René Garcia^1,4, Chun-hui Chang² and Stephen Maren^2,3

¹ Laboratory of Neurobiology and Psychopathology, University of Nice-Sophia Antipolis, 06108 Nice, France² Department of Psychology and³ Neuroscience Program, University of Michigan, Ann Arbor, Michigan 48109, USA

Lesion studies indicate that rats without the medial prefrontal cortex (mPFC) have difficulty recalling fear extinction acquired the previous day. Several electrophysiological studies have also supported this observation by demonstrating that extinction-related increases in neuronal activity in the mPFC participate in expression of fear extinction. However, a more recent study has shown that fear extinction can be recalled, in certain circumstances, without mPFC potentiation, suggesting contribution of other circuits. Here, we examined this possibility in rats that were subjected to auditory fear conditioning, extinction training, and extinction retention test 7 d later. Electrolytic lesions were made in the mPFC, the motor cortex (MO), the dorsal septum (SEP), or the mediodorsal thalamus (MD), because of their potential participation in conditioned fear inhibition; combined lesions including the mPFC with the MO, SEP, or MD were also made. The lesions were made either 1 wk before conditioning or 1 d after extinction training. All rats normally extinguished their conditioned freezing behavior during extinction training and did not display any return of this behavior during the retention test. These data reveal that the mPFC is not required for the acquisition, the expression, or the retrieval of extinction memories but do not exclude the possibility that the mPFC normally participates in these processes.

Article published online ahead of print. Article and publication date are at http://www.learnmem.org/cgi/doi/10.1101/lm.60406.

Corresponding author.

⁴ E-mail rgarcia{at}unice.fr; fax 33-492-07-61-62.

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