PGO waves are usually observed
A. during stages 1 and 2 of NREM sleep.
B. during all stages of NREM sleep.
C. during REM sleep.
D. immediately after the subject awakens.
Answer: C
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Motor units that include Type IIb fibers
A. usually include Type IIa fibers as well. B. produce about 100 times the force as units that include Type I fibers. C. produce about one-third of the force produced by units that include Type IIa fibers. D. are rarely found in humans.
In a study comparing British and Ugandan perceptions of beauty:
a. British and Ugandan individuals rated average-size females more attractive. b. British and Ugandan individuals rated the drawings differently, with British participants rating thinner bodies as more attractive and Ugandan participants rating larger female figures more attractive. c. British and Ugandan individuals rated the drawings differently, with British participants rating the larger female figures as more attractive and Ugandan participants rating thinner female figures less attractive. d. both British and Ugandan individuals rated drawings of thinner female figures as more attractive.
The DSM-IV criterion for mental retardation called "concurrent deficits or impairments in adaptive functioning" is defined as significant difficult in at least .... area(s) such as communication, self-care, home living, etc.
A. one B. two C. three D. four
In a ____________, reinforcement always follows the first response after a set amount of time.
variable-interval schedule variable-ratio schedule fixed-interval schedule fixed-ratio schedule