Perirhinal cortex inactivation produces retrieval deficits in fear extinction to a discontinuous visual stimulus.

Several studies suggest that the perirhinal cortex (PER) may function to unitize stimulus components across time or modalities. While the PER has been shown to be critical for fear acquisition to discontinuous stimuli, the role of the PER in fear extinction memory has not been evaluated. The current study assessed the involvement of the PER during fear extinction training to a continuous or discontinuous conditioned stimulus (CS).