Final answer:
Dr. Samuelson, who conducts research on the relationship between strokes and speech problems, is most likely a health psychologist. Health psychologists study how biological, psychological, and social factors contribute to health and well-being. They focus on understanding how physical health conditions and behaviors affect mental and emotional well-being, and vice versa. In this case, Dr. Samuelson's research on strokes and speech problems falls under the domain of health psychology.
Step-by-step explanation:
Considering the focus of Dr. Samuelson's research on the relationship between strokes and speech problems, he is most likely a neuro psychologist. Neuro psychology is concerned with how a person's cognition and behavior are related to the brain and the rest of the nervous system. Professionals in this field study the cognitive effects of brain injury or neurological diseases, such as stroke, and how they manifest in different speech and language problems. This particular research fits within the neuro psychological realm, as it involves understanding the impact of neurological events on speech processes.