Reduced goal-directed activity or motivation relative to a person’s previous functioning. Initiation, valuation, effort and emotional experience require separate assessment; inactivity is not automatically anhedonia or motor incapacity.
A marked reduction of spontaneous initiative or willful activity. Preserved behavior after prompting can help distinguish impaired self-initiation from inability to execute the same action.
A severe reduction of spontaneous mental and behavioral activity that improves with external stimulation or instruction. Clinical descriptions after bilateral basal ganglia injury motivated experiments separating self-activation, incentive translation and motor capacity.[ref]
Pure psychic akinesia with bilateral lesions of basal ganglia by Dominique Laplane and others. 1984, externally elicited versus spontaneous behavior
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