While playing at the park, Sam and Carlos run after one another, wrestle, and pretend to fight. The boys are engaged in
A) functional play.
B) a hostile interaction.
C) rough-and-tumble play.
D) repetitive motor action.
C
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What type of evidence, if any, links sexual orientation to genetic influences?
a. Comparisons of people in different cultures b. Comparisons of monozygotic and dizygotic twins c. Observations of consistency from childhood to adulthood d. No evidence supports this conclusion.
What is indicated by a positive value for a correlation?
a. Increases in X tend to be accompanied by increases in Y b. Increases in X tend to be accompanied by decreases in Y c. A much stronger relationship than if the correlation were negative d. A much weaker relationship than if the correlation were negative
Findings supporting serotonin neurotoxicity occuring in humans who heavily use MDMA include the following except…
a. lower cerebrospinal fluid levels of 5-HIAA. b. lower levels of serotonin membrane transporters from PET imaging. c. lower levels of serotonin membrane transporters from PET imaging in those no longer using MDMA. d. increased levels of serotonin receptors.
In the experimental method, the _____ is sometimes referred to as the treatment
a) independent variable b) dependent variable c) confounding variable d) heuristic value