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Obsessive-compulsive disorder: a disorder of pessimal (non-functional) motor behavior
Acta Psychiatrica Scandinavica, 04/14/09

Eilam DA et al. - The abundance of irrelevant or unnecessary acts in OCD motor rituals represents reduced functionality in terms of task completion, typifying OCD rituals as pessimal behavior (antonym of optimal behavior).

Methods

Comparing motor rituals of OCD patients with behavior of non-patient control individuals who were instructed to perform the same motor task.

Results

Obsessive–compulsive disorder behavior comprises abundant acts that were not performed by the controls.
These acts seem unnecessary or even irrelevant for the task that the patients were performing, and therefore are termed 'non-functional'.
Non-functional acts comprise some 60% of OCD motor behavior.
Moreover, OCD behavior consists of short chains of functional acts bounded by long chains of non-functional acts.