Melatonin is a __________
a) hormone.
b) sleeping pill.
c) depressant.
d) stimulant.
a
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Unintentional injuries from accidents are the cause of ______ deaths in children and adolescents in the United States.
A. one in two B. one in three C. one in five D. one in seven
A mute mental patient is first given a token each time he or she says a word. Next, tokens are given for speaking a complete sentence. Later, the patient is gradually required to speak more often, then to answer questions, and eventually to carry on a short conversation in order to receive tokens. This gradual improvement of the patient's communication skills is an example of
a. shaping. b. reciprocal inhibition. c. classical conditioning. d. systematic desensitization.
Jeffrey Gray's ideas on arousability include the notion that the _____ system activates approach behaviour in response to the anticipation of reward.
A) behavioural activation B) reward-seeking C) sensation-seeking D) emotion-eliciting
Despite recent extinctions, the majority of species that ever were alive are still alive today
Indicate whether the statement is true or false