Final answer:
The article published by the neuropsychologist based on research of an individual with amygdala damage is a case study.
Step-by-step explanation:
A case study is a research method involving an in-depth investigation of a single individual or a small group, particularly one undergoing an unusual circumstance or condition. In the context of the neuropsychologist's work, this method allows for a detailed examination of the amygdala's role in the perception of emotional expressions and body language as affected by damage to this specific brain region.