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- Main article: Apraxia
Akinesia is the inability to initiate movement, due to problems with selecting and activating motor programs in the brain. It is a common consequence of Parkinson's disease caused by dopamine loss in the direct pathway of movement. There is a general quietening of spontaneous motor activity and production of everyday gestures.
The word "akinetic" comes from the prefix "a-" meaning "without" + the Greek word "kinesis" meaning motion = without motion.
For example, a person in coma is akinetic. For another example, akinetic mutism is a condition in which a person is both mute and akinetic. A textbook on clinical neurology observes that a person with akinetic mutism has "sleep-waking cycles but, when apparently awake, with eyes open, lies mute, immobile and unresponsive." some dictionaries describe it as loss of normal muscle tone.
Neurology of the condition
The impairments can arise from lesions in the motor cortex.
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