A researcher hypothesizes that high doses of caffeine can produce state-dependent learning. To confirm this hypothesis, the researcher would need to show that:

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State-dependent learning refers to the phenomenon where recall is improved when the individual is in the same state (physiological or psychological) during both encoding and retrieval. Therefore, to confirm the hypothesis that high doses of caffeine can produce state-dependent learning, the researcher would need to show that participants who studied the material after drinking a great deal of coffee would remember the material better if they drank a great deal of coffee just before taking the memory test. This is best captured by choice D.

A Researcher Hypothesizes That High Doses of Caffeine Can Produce