In classical conditioning the stimulus that normally evokes an automatic response without new learning is called the _____________
A) conditioned stimulus
B) reflexive stimulus
C) unconditioned stimulus
D) orienting stimulus
Answer: C
Rationale: An unconditioned stimulus (US) is a stimulus that elicits a reflexive response without learning. The reflexive response to an US is known as an unconditioned response (UR).
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Important changes to the regulation of drugs by the Food and Drug Administration occurred in 1938 and 1962, largely in response to
A. testimony by medical doctors. B. pressure from the drug manufacturers. C. the Elixir Sulfanilamide poisonings and birth defects from thalidomide. D. increased smuggling.
The trichromatic theory explains:
a. the first level of color processing, which occurs in the retina. b. the second level of color processing, which occurs in the ganglion cells. c. the third level of color processing, which occurs in the thalamus. d. the fourth level of color processing, which occurs in the visual cortex.