If a person receives the chemical L-dopa, a precursor of dopamine, it reduces the symptoms of Parkinson's disease. However, L-dopa may increase symptoms of schizophrenia. What might one reasonably conclude from this?
A) L-dopa causes schizophrenia.
B) Excessive dopamine produces schizophrenic symptoms.
C) Antipsychotic medication decreases the amount of L-dopa in the brain.
D) Antipsychotic medication increases the amount of dopamine in the brain.
Answer: B) Excessive dopamine produces schizophrenic symptoms.
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Conditions like albinism or fused toes are physical dysfunctions but would not be regarded as mental disorders because they
a. are physical. b. do not cause any harm. c. are rare. d. are not easily diagnosed.
What do neuroscientists mean when they say that the brain is plastic?
a) The brain resembles silly putty. b) The brain can change over time. c) Most of the brain is the consistency of plastic. d) Most of the brain consists of structures that are similar to toys.