Studies have shown that the people who engage in physical activity and mental games as they age have a smaller chance of developing Alzheimer's disease. Which neurotransmitter system is most likely involved in these two activities?
A. Dopamine
B. Serotonin
C. GABA
D. Acetylcholine
Answer: D
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What can a six-month-old child do that will be effective in giving her parent a happy greeting?
A. The child becomes able to focus on objects about seven inches away from the face. B. The child learns to walk. C. The child learns his or her first words. D. The child demonstrates social smiling.
In every experiment there are individual differences between participants. This variation is:
a. systematic. b. unsystematic. c. systematic error. d. nonsystematic error.
Puberty
a. occurs earlier in boys than in girls. b. occurs earlier in girls who experience stress than in girls who have less stress. c. occurs later in boys who experience stress than in boys who have less stress. d. is not influenced by genetics.
A conceptual variable that is known to exist but cannot be directly observed is called ______.
A. a hypothesis B. a construct C. an operation D. a concept