[1] In psychology, it is defined as a lack of restraint manifested in disregard of social conventions, impulsivity, and poor risk assessment.
[2] Hypersexuality, hyperphagia, substance abuse, money mismanagement, frequent faux pas, and aggressive outbursts are indicative of disinhibited instinctual drives.
[3] Disinhibition in psychology is defined as a lack of inhibitory control manifested in several ways, affecting motor, instinctual, emotional, cognitive, and perceptual aspects with signs and symptoms, such as impulsivity, disregard for others and social norms, aggressive outbursts, misconduct, and oppositional behaviors, disinhibited instinctual drives including risk-taking behaviors and hypersexuality.
Prominent impulsivity, affective instability, and disinhibition are seen frequently, secondary to injury to frontal, temporal, and limbic areas.
In association with the typical cognitive deficits, these sequelae characterize the frequently noted "personality changes" in TBI (Traumatic Brain Injury) patients.