The movement ratio grew fastest when the CS
a. was a low-intensity tone.
b. was a high-intensity tone.
c. alternated between low-intensity and medium-intensity.
d. Alternated between medium-intensity and high-intensity.
b. was a high-intensity tone.
Answer feedback: The movement ratio is a proportion: The amount of time during the CS interval that is spent in freezing or other fear-related behavior divided by that same amount plus the amount of time spent in active movement. The high-intensity tone produced the highest level of freezing and other-fear-related behavior, thereby producing the highest values of the movement ratio during acquisition. The procedure did not include the use of alternating stimuli.
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