In their classic 1968 study of the reinforcing properties of cocaine, Pickens and Thompson substituted saline infusions for cocaine. In response,
a. there was a short burst of lever pressing before the rats stopped responding altogether.
b. rats’ responding slowed gradually before finally stopping altogether.
c. rats’ responding ceased immediately.
d. rats’ responding continued to occur at a similar rate.
e. there was an increase in rats’ responding, compared to previous levels.
Answer: A
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Fill in the blank(s) with correct word
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a. phonology b. meaning c. grammar d. communication
Comprehension of _____ is necessary for children to develop an understanding of conservation
a) transformation b) egocentrism c) identity d) personal fable