disinhibition
n.
1. diminution or loss of the normal control exerted by the cerebral cortex, resulting in poorly controlled or poorly restrained emotions or actions. Disinhibition may be due to the effects of alcohol, drugs, or brain injury, particularly to the frontal lobes. 2. in conditioning experiments, the reappearance of responding, which has stopped occurring as a result of exposure to extinction, when a new stimulus is presented.