***(A)*** *What are the functions of these brain areas?* *Amygdalostriatal transition area:* Function of the **amygdalostriatal transition area**: * It plays a critical role in encoding stimuli to direct behavioral responses ([source](https://tyelab.org/wp-content/uploads/2022.10.28.514263v1.full-min.pdf)). Function of the amygdalostriatal transition zone (ASt) is to act as a critical mediator in the brain's response to environmental threats by representing an internal state (such as fear) that can be expressed through various motor outputs (like freezing or escape). The ASt effectively connects the corticolimbic system (involved in evaluation) with the basal ganglia (involved in action selection), serving as a "shortcut" between the amygdala and the striatum. This positioning allows it to rapidly and accurately encode and sustain responses to negative valence stimuli, which is essential for directing appropriate defensive behaviors. The ASt's neurons are characterized by sparse coding, high signal-to-noise ratio, and sustained response, making it a vital component in the brain's threat response mechanism. ([source](https://tyelab.org/wp-content/uploads/2022.10.28.514263v1.full-min.pdf)) * The function of the Amygdala is linking emotions to many other brain abilities, especially memories, learning and senses. ([source](https://my.clevelandclinic.org/health/body/24894-amygdala#:~:text=Your%20amygdala%20is%20a%20small,memories%2C%20learning%20and%20your%20senses))