Which phenomenon describes involuntary movements that are not contextually appropriate?

Which phenomenon describes involuntary movements that are not contextually appropriate?

• A. Tremors due to Parkinsonism
• B. Disinhibition of associated movements
• C. Dyskinesia
• D. Tics

Answer: (B)

Disinhibition of associated movements describes involuntary movements that accompany a voluntary action but are not appropriate to the task at hand. Normally, when you perform a purposeful movement, inhibitory systems keep other muscle groups from moving inappropriately. When this inhibition is lost or reduced, those “associated” motor programs can be released, causing involuntary movements in parts of the body that aren’t part of the intended movement. This release phenomenon is what makes movements spill over and appear contextually inappropriate. For example, during a purposeful hand movement you might see an unintended movement of an nearby body part, like the face or leg, due to this loss of inhibitory control. This differs from tremor in Parkinsonism (a rhythmic, often rest-related tremor), dyskinesia (a broad category of abnormal, often drug-induced movements), or tics (sudden, recurrent, sometimes suppressible movements or sounds).

Disinhibition of associated movements describes involuntary movements that accompany a voluntary action but are not appropriate to the task at hand. Normally, when you perform a purposeful movement, inhibitory systems keep other muscle groups from moving inappropriately. When this inhibition is lost or reduced, those “associated” motor programs can be released, causing involuntary movements in parts of the body that aren’t part of the intended movement. This release phenomenon is what makes movements spill over and appear contextually inappropriate.

For example, during a purposeful hand movement you might see an unintended movement of an nearby body part, like the face or leg, due to this loss of inhibitory control. This differs from tremor in Parkinsonism (a rhythmic, often rest-related tremor), dyskinesia (a broad category of abnormal, often drug-induced movements), or tics (sudden, recurrent, sometimes suppressible movements or sounds).