Which field studies bumps and irregularities on the skull for understanding behavior?

Phrenology is the field that specifically studies the bumps and irregularities on the skull in order to understand personality traits and behaviors. In the early 19th century, phrenologists believed that the shape of the skull reflected underlying brain development and could provide insights into an individual's character and intellectual capabilities. Although phrenology has been discredited and is no longer considered a scientific discipline, it played a significant role in the history of psychology and criminology by trying to link physical characteristics to psychological traits.

Cognitive Behavioral Analysis focuses more on the relationships between thoughts, feelings, and behaviors, rather than physical attributes. Neuroscience examines the brain and nervous system's role in mental processes but doesn't specifically relate to the shape of the skull. Psychopathology studies mental disorders and their manifestations but does not engage with physical features of the skull in the way phrenology does. Thus, phrenology clearly aligns with the question about studying skull characteristics to infer behavior.