Final answer:
The name for the field of study that researches the interplay between the brain, immune system, and psychological factors, especially in the context of stress, is psychoneuroimmunology.
Step-by-step explanation:
The new field of study that researches the relationship among the brain, immune system, and psychological factors with regard to stress-related events is known as psychoneuroimmunology. This discipline examines how psychological factors such as stress influence immune function and overall health.
The term was first coined in 1981, and the field has grown significantly, encompassing the intricate interactions between the nervous, endocrine, and immune systems, and how these can be affected by psychological states. Psychoneuroimmunology has made significant contributions to our understanding of health psychology and has underscored the importance of psychological influences on immune response.