Caffeine is thought to relieve headaches because it is
A. a vasodilator.
B. a vasoconstrictor.
C. an adenosine antagonist.
D. an adenosine agonist.
B
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In one study, compared to normal participants, participants injected with Botox showed less brain activity while they imitated angry faces. Thus, it is indeed possible that these participants felt less emotion as a consequence of the Botox, according to which theory of emotion?
a. facial feedback hypothesis b. the common sense theory c. attribution theory d. emotional appraisal theory
Does imprinting occur in humans?
a. yes b. yes, but only if it occurs during a critical period c. no d. It depends upon how vulnerable the infant is at birth.
According to the psychoanalytic view, obsessive-compulsive disorder is a result of
a) fixation at the oral stage. b) reawakened childhood Oedipal fears. c) introjected anger. d) struggles to control instinctual impulses.
In a 2 ? 2 complex design, one independent variable was shown not to have a statistically significant main effect on the dependent variable. Based on this, we can state that
A. the independent variable has external validity over the levels of the second independent variable. B. it is not a relevant independent variable. C. for the variable to be considered relevant in this experiment, it must interact with the second independent variable. D. the variable will definitely interact with the second independent variable in this experiment.