( cortex activity was identical during v...)Alien Hand Syndrome Causes Random Hand Movement,Health

cortex activity was identical during voluntary and alien left hand movements.

Supplemental motor area regions on both sides were activated by left more than right movements, which suggests a greater degree of motor preparation and control when moving the affected hand, according to the authors.

To our knowledge, these fMRI results reveal for the first time the neural correlates of AHM, the authors state, and a major new finding is that AHM was associated with highly selective and isolated activation of the contralateral primary motor cortex.

The fact that motor cortex activity was identical during AHM and voluntary movements indicates that conscious and unconscious motor activity involves the same underlying brain structures and that activity in the primary motor cortex does not correlate with voluntary movement.

In addition, the study shows that while M1 [primary motor cortex] may code for limb movement planned by parietal systems, only activity in the latter (but not the former) may mediate conscious experience of motor intentions.

The authors conclude, These data open new perspectives for the comprehension of neurological and neuropsychiatric disorders associated with abnormal motor control or abnormal awareness of action, such as utilization behavior, phantom limb, anosognosia [in which a person suffers a disability due to a brain injury but is unaware of it], or delusions of control in schizophrenia.


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