In the Period of Time Immediately Following Focal Brain Injury

question 67

Multiple Choice

In the period of time immediately following focal brain injury to the supplementary motor cortex, patients may reach out and grasp objects with the affected arm when they have not been asked to do so, or even when they have been explicitly told not to do so. This is an example of

• A)apraxia.
• B)hemiplegia.
• C)Huntington's disease.
• D)alien hand syndrome.

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Definitions:

All Or None

A principle stating that a neuron either fires with a full response or does not fire at all, depending on stimulus strength.

Contraction

The process in which a muscle becomes shorter and tighter, producing movement or exerting force.

Single Muscle Contraction

The process by which a muscle fiber receives a nerve impulse and momentarily contracts or shortens.

Tetanus

A bacterial infection characterized by muscle spasms, often starting in the jaw, and can lead to severe health complications if not treated.