Abimus

Abimus is a historical term used in neurology to describe a dissociation between intention and motor execution: a person is aware of a goal and desires to perform a movement, but the movement is not carried out. In this sense, abimus refers to an inability to act despite the intent to act, and it has been used to describe certain functional or dissociative motor phenomena. The term is not widely used in contemporary diagnostic manuals and has largely fallen out of standard clinical practice, supplanted by more specific descriptions of functional neurological symptoms or apraxic disorders.

Clinical descriptions of abimus overlap with concepts such as conversion symptoms, functional neurological disorder, and apraxia. Its interpretation has varied: some authors view it as a failure of motor planning (ideomotor or ideational apraxia) or as a dissociation arising from psychogenic factors; others consider it a historical label for episodic paralysis of the will to move. Because of inconsistent usage, precise criteria for abimus are not established, and modern neurology tends to frame similar presentations in terms of functional motor disorder, dissociation, or apraxia rather than as a separate entity.

Evaluation typically involves a neurological examination that tests strength, coordination, sensation, and reflexes, along with observation of attempts to move and correlation with electrophysiological studies if needed. Management focuses on multidisciplinary approaches, including physical therapy, occupational therapy, and treatment of any underlying psychiatric conditions, with emphasis on patient education and functional rehabilitation. The rarity and variability of reported cases contribute to ongoing discussion about the utility and validity of the term.