Dopamine receptor
Dopamine receptor activation (both D1 and D2 receptor subtypes) in the amygdala contributes to the acquisition of fear conditioning. D1 and D2 receptors are G protein coupled and inhibit adenylate cyclase (Gi-coupled) and stimulate adenylate cyclase (Gs-coupled), respectively. Just like β-ARs, dopamine receptors may modulate Hebbian processes directly by reducing feed-forward inhibition. They may also act in a parallel fashion with Hebbian mechanisms to implement synapses in the lateral amygdala and promote plasticity and fear learning through their respective signaling pathways.