👉 The term "arouser" is a term used in the field of psychology and neurology, specifically relating to the brain's response to stimuli. It refers to an external stimulus that stimulates or activates specific areas of the brain responsible for emotions, such as the amygdala, which plays a significant role in emotional responses. Arouser can be defined as any external stimulus that triggers a neural pathway within the brain to produce an emotion such as happiness, fear, anger, or sadness. It