Apraxia is a neurological isorder characterized by loss of the ability to execute or carry out learned purposeful movements, despite having the desire and the physical ability to perform the movements. It is a disorder of motor planning which may be acquired or developmental, but may not be caused by incoordination, sensory loss, or failure to comprehend simple commands (which can be tested by asking the person tested to recognize the correct movement from a series). Apraxia should not be confused with aphasia, an inability to produce and/or comprehend language, or abulia, the lack of desire to carry out an action.