What ordinarily prevents extensor muscles from contracting at the same time as flexor muscles?
a. the ligaments and tendons that bind them together
b. learned patterns of coordination in the cerebral cortex
c. inhibitory synapses in the spinal cord
d. control of both muscles by different branches of the same axon
c
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Jacob has been working at his computer for the past two hours, and the hum that he found so annoying when he started no longer bothers him. The change in Jacob's sensitivity to the noise from the computer illustrates the process known as
a. perceptual invariance. b. perceptual assimilation. c. adjusting just noticeable differences. d. sensory adaptation.
Shelby is 6 years old. During middle childhood, her physical growth will most likely
a. be steady until the adolescent growth spurt. b. show dramatic spurts. c. show rapid gains in height, but slow steady gains in weight. d. show rapid gains in weight, but slow steady gains in height.
A correlation coefficient communicates two pieces of information about the relationship between two variables: The ____ communicates the direction of the relationship, and the ____ communicates the strength of the relationship
a. value; sign b. sign; value c. slope; value d. sign; slope
Which of the following statements about instincts is FALSE?
A) An instinct is a pattern of behavior that is assumed to be universal throughout a species. B) Instincts are learned behavioral responses. C) Instincts are generally set in motion by a "sign stimulus." D) Instincts may explain a great deal of nonhuman animal behavior.