Final answer:
The amygdala is active in response to emotional arousal and stressful situations. During thrilling activities such as gambling, amygdala activity is likely to increase due to emotional responses related to risk and reward, hence in the gain frame when choosing to gamble, amygdala activity probably increased.
Step-by-step explanation:
The question pertains to the role of the amygdala in decision-making under risk, such as gambling. Research into the amygdala's involvement in emotional responses, particularly those related to fear and anxiety, indicates that the amygdala is active during emotional arousal and stressful situations.
In situations involving potential gain, such as the context of the question, the amygdala's response can vary based on the individual's emotional state and the framing of the decision. Although the question does not provide specific context to direct answers regarding increased or decreased activity during gambling, based on the literature provided, the amygdala is associated with emotional responses.
When engaging in gambling, which can be a thrilling and arousing activity, one might expect an increase in amygdala activation due to the emotional and stress responses tied to the risk and reward aspects of gambling. This is in line with research suggesting that experiences that stimulate arousal and thrill, like gambling, can cause changes in the activity of the amygdala and the release of stress hormones such as norepinephrine. Therefore, in the gain frame, it is plausible that activity in the amygdala increased when choosing to gamble.