单项选择题

According to the passage, behavioral psychologists studying the extinction process have discerned which of the following

(A) The exact length of time required for a fear response to become extinct in a human subject
(B) The effect of tone conditioning in comparison with other forms of stimuli
(C) The possible effects of surgical operations on the infralimbic cortice
(D) The potential of tone conditioning in treating undesirable fear responses
(E) The limits of Pavlov’s contribution to modern behavioral psychology

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单项选择题

Which of the following most accurately describes the passage

(A) A description of a replicable experiment
(B) A summary report of new findings
(C) A recommendation for pursuing a new area of research
(D) A refutation of an earlier hypothesis
(E) A confirmation of an earlier research

单项选择题

According to the passage, infralimbic neurons … fire to the tone only when rats are recalling extinction on the following day (lines 7-9) for which of the following reasons

(A) Extinction has not been proven to erase the memory of fear conditioning in rats.
(B) The extinction response requires a number of days to develop.
(C) The subject’s original fear response was not conditioned to a tone.
(D) The infralimbic cortices carry the memory of fear extinction.
(E) Rats that show the least fear demonstrate the greatest increase in infralimbic tone responses.