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Based on the provided case study context, explain how the backward digit span task acts as a behavioral measure of working memory capacity rather than a self-report measure, and identify what specific measurement serves as the operational definition of this capacity for Dr. Aris.
Case context: Dr. Aris is investigating cognitive performance in sleep-deprived individuals. In the laboratory, Dr. Aris reads sequences of numbers to participants and asks them to repeat each sequence backward. The length of the longest sequence that a participant correctly repeats is recorded as their score. Dr. Aris uses this score to represent their working memory capacity.
Question: Based on the provided case study context, explain how the backward digit span task acts as a behavioral measure of working memory capacity rather than a self-report measure, and identify what specific measurement serves as the operational definition of this capacity for Dr. Aris.
Sample answer: The backward digit span task is a behavioral measure because it requires the participant to perform an active cognitive task in a structured laboratory environment where their actual performance is observed and recorded, rather than asking them to report their own perceived memory capacity. The operational definition of working memory capacity in this study is the length of the longest sequence of digits that the participant correctly repeats in reverse order.
Key points:
- The measure is behavioral because it relies on actual task performance in a laboratory rather than self-reported memory capability.
- The operational definition of working memory capacity is the length of the longest sequence correctly recalled in reverse order.
Rubric: The response must explain why the measure is behavioral (direct performance of a laboratory task rather than subjective self-reporting) and correctly identify the operational definition (the length of the longest correctly recalled reverse sequence).
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Research Methods in Psychology - 4th American Edition @ KPU
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