Wickens et al.'s "fruit, meat, and professions" experiment failed to show a release from proactive interference in the "fruit" group because
a. the stimulus category changed.
b. the stimulus category remained the same.
c. the response task changed.
d. the response task remained the same.
b
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Studies with ______ indicate that ethnic differences in IQ scores are reduced and often disappear when we factor in socioeconomic differences.
A. twins B. boarding school students C. foster children D. adoptees
Which of the following is an example of a direct parental influence on children's peer sociability?
A) Maxine arranges for her 4-year-old to play with his friend at the park. B) Regina allows her 3-year-old to choose her own playmates. C) Tamie plays house with her 4-year-old. D) David and his 3-year-old play with blocks.
What is the basis for identifying members of a category using the prototypal approach found in the DSM-IV-TR diagnostic system?
a) They must share all of the same symptoms. b) They will share some of the same symptoms. c) They exhibit the same degree of symptom severity. d) They exhibit none of the symptoms found in other categories.
Which skill occurs separately from the concrete operational stage?
A. centration B. seriation C. class inclusion D. transitive inference