The generalization gradient produced by the generalization test in Exercise 40
a. had its maximum at 3.0 kHz.
b. was essentially symmetrical around the center of 2.0 kHz.
c. had a V shape with a minimum at 2.0 kHz.
d. was essentially flat across the range from 1.0 to 3.0 kHz.
b. was essentially symmetrical around the center of 2.0 kHz.
Answer feedback: The maximum of the gradient was at the frequency used during discrimination training (2.0 kHz). The number of responses fell off on both sides of 2.0 kHz in about the same way, making the gradient symmetrical.
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George has gone into a deep depression after the death of his wife, for whom he had provided daily care for over 2 years after her first stroke. What role might cortisol play?
a. ?Over-response of the hippocampus may have led to reduced cortisol in the bloodstream, which is associated with depression. b. ?Under-response of the hippocampus may have led to reduced cortisol in the bloodstream, which is associated with depression. c. ?Consistently elevated levels of cortisol due to stress can overwhelm the hippocampus’s feedback loop and lead to excess levels of cortisol in the bloodstream, which is associated with depression. d. ?Erratic levels of cortisol due to stress can disrupt the hippocampus’s feedback loop and lead to erratic levels of cortisol in the bloodstream, which is associated with manic depression.
L.L. Thurstone suggested that intelligence should be conceptualized as having multiple types of intelligence that are independent of each other. Which of the following were NOT among the seven he proposed?
a. perceptual speed b. numerical ability c. verbal fluency d. intrapersonal intelligence
The average threshold for human vision is a candle flame seen from __________ on a dark, clear night
a) 1 mile b) 15 miles c) 7.5 miles d) 30 miles
T cells are to _____ as B cells are to _____
a) stress; health. b) antibodies; lymphocytes. c) antigens; the thymus gland. d) the thymus gland; bone marrow.