Two schedules of reinforcement that produce the highest rates of response are
a. continuous and fixed interval.
b. fixed interval and variable interval.
c. variable interval and variable ratio.
d. fixed ratio and variable ratio.
D
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In a study that is described in the textbook, researchers recruited 15 participants who were currently experiencing depression and 45 control participants with no history of depression
Participants wore a device that allowed researchers to monitor eye movements. When photographs representing different emotions were displayed, a. participants who were currently depressed spent more time looking at sad photos and less time looking at positive photos. b. participants who had recovered from depression had particular difficulty looking at sad photos, preferring the positive ones. c. participants who had no history of depression had particular difficulty looking at happy photos. d. participants who were currently depressed had particular difficulty looking at sad photos, preferring the positive ones.
At 6 months of age, Alexandra could reach out and grab a toy with her hand, but was unable to pick up a small toy with her finger and thumb until she was 9 months of age. This illustrates what developmental trend?
a. patterned-response trend b. gross-to-specific trend c. cephalocaudal trend d. differentiated-to-integrated trend