Which of the following kinds of evidence is LEAST likely to be used in cognitive psychology?

Question

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Self-reported dreams may be considered subjective and difficult to verify, which may make them less reliable and therefore less likely to be used as evidence in cognitive psychology research. Alternatively, brain activity in the form of fMRI, behavioral findings such as response times, and case studies of patients with brain damage provide more objective and measurable evidence for cognitive processes.

Which of the Following Kinds of Evidence Is LEAST Likely