Final answer:
The amygdala is integral in processing emotional responses, especially in situations invoking fear or anxiety. However, without direct evidence from the provided references, an accurate answer to the specific question of increased or decreased amygdala activity when choosing to gamble in a loss frame cannot be given.
Step-by-step explanation:
In the context of decision-making under risk, such as gambling, the amygdala plays a critical role in processing emotional responses. Based on the research literature, it is understood that the amygdala is involved in the emotional aspects of decision-making and its activity fluctuates with emotional state like fear or anxiety.
When faced with risky decisions, such as choosing to gamble, it is reasonable to deduce that the amygdala activity might demonstrate an alteration; however, the question of whether amygdala activity increased or decreased in a loss frame while choosing to gamble is not directly addressed in the presented literature.
Consequently, without a specific study directly linking amygdala activity to the act of gambling in a loss frame, we cannot confidently provide a factually accurate response to whether the activity increased or decreased.