Which of the following requires an inhibitory interneuron?
A) reciprocal innervation
B) recurrent collateral inhibition
C) isometric contraction
D) all of the above
E) both A and B
Answer: E
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An experimenter tests the hypothesis that physical exercise improves mood. Subjects in the experimental group participate on Monday and Tuesday and those in the control group on Wednesday and Thursday. What is the independent variable?
a. the hypothesis b. the day of the week c. the exercise d. the mood (degree of happiness)
Which of the following is NOT an assumption of the t test for independent groups?
a. The data are interval or ratio. b. The underlying distributions are bell-shaped. c. The observations are independent. d. There is no homogeneity of variance.
According to research, physiological changes may ____ the intensity of emotional experiences.
A. increase B. decrease C. stabilize D. mask
The majority of cases of cerebral palsy are caused by
A) lack of oxygen to the brain during birth. B) problems in brain development during the prenatal period. C) head injuries from accidents before age 1. D) a virus passed from the mother to the child.