A Person Who Loses an Arm May at First Have

question 690

Multiple Choice

A person who loses an arm may at first have a phantom arm and hand. Then after many years, the phantom may shrink, until only a hand is felt at the shoulder. This shows that

• A)the pain and sensations are now passing directly through the pain gates.
• B)the pain and sensations are now passing through the central biasing system.
• C)phantom limb sensations are "sane hallucinations" that can be cognitively suppressed.
• D)the brain gradually reorganizes to adjust for the sensory loss.

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Definitions:

Dependent Variable

The variable in a study that is expected to change in response to changes in the independent variable, often measured to assess the effect of a treatment.

Experimental Group

The group in an experiment that receives the treatment or condition being tested, as opposed to the control group.

Control Group

In scientific research, a group of subjects that does not receive the experimental treatment and is used as a baseline to compare the effects of the treatment.

Low-Fat Diet

A nutrition plan focusing on reducing the intake of fats, particularly saturated fats and trans fats, for health reasons.