Final answer:
Dr. Radcliff's work, which includes examining the connection between stress and illness, falls within the discipline of psychophysiology. This field studies the physiological effects of psychological processes, and is associated with health psychology, which uses the biopsychosocial model to understand health.
Step-by-step explanation:
Dr. Radcliff's work is in the discipline of psychophysiology (c).
Dr. Radcliff studies the impact of thoughts and feelings on the body's ability to fight illness and disease, specifically focusing on the relationship between stress and the frequency and severity of illness. This interdisciplinary field draws from psychology, health psychology more specifically, and encompasses physiological responses to psychological stimuli. The scientific term for this domain is psychophysiology, which includes the study of how psychological processes such as stress affect physiological functions and contribute to the development of health issues like immunodeficiency and stress-related diseases. Health psychology is a closely related discipline that involves understanding the psychological influences on health, illness, and how people deal with sickness, emphasizing the role of behavioral and lifestyle factors in the development of diseases.
It also investigates interventions to change unhealthy behaviors and identify at-risk demographics based on psychological or behavioral factors. These fields draw upon the biopsychosocial model to understand how a combination of biological, psychological, and sociocultural factors influence health and well-being.