<span>Dr. Vance is likely a Cognitive Psychologist. As a Cognitive Psychologist, Dr. Vance is studying how his subjects perform cognitively (using their brain capacity and function). In this particular case, he is measuring this functionality by having his subjects solve puzzles to discover how the mind solves said puzzles.</span>
Correlational research strategy describes the relationship between variables and measuring the strength of the relationship. This is the researcher's base for the research.