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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