Weegy: A procedure in which a person learns to control through conscious thought internal physiological processes such as blood pressure, heart and respiration rate, skin temperature, sweating, and the constriction of particular muscles is called biofeedback.
User: An experiment is the only way that psychologists can establish what kind of relationships through research?
A. Correlational relationships
B. Negative relationships
C. Positive relationships
D. Cause and effect relationships
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