Final answer:
The subject of this question is Biology, specifically the study of brain activation and its relation to emotions and psychological factors. The research suggests that characteristics like Type A personality or external locus of control do not strongly influence brain activation when watching sad or neutral movies. However, mindfulness meditation training can lead to similar brain activation patterns across different emotional stimuli.
Step-by-step explanation:
The subject of this question is Biology, specifically the study of brain activation and its relation to emotions and psychological factors.
The research mentioned in the question suggests that there were no strong differences in brain activation when individuals with certain characteristics watched sad or neutral movies. The options given in the question, such as being a Type A personality or perceiving an external locus of control, were not found to be related to the observed patterns of brain activation. However, individuals who had been trained in mindfulness meditation showed similar brain activation patterns when watching sad or neutral movies.
This information highlights the importance of psychological factors, such as mindfulness meditation training, in modulating brain response to emotional stimuli.