Muscarinic receptors modulate the intrinsic excitability of infralimbic neurons and consolidation of fear extinction.
Santini E, Sepulveda-Orengo M, Porter JT. Muscarinic receptors modulate the intrinsic excitability of infralimbic neurons and consolidation of fear extinction. Neuropsychopharmacology. 2012 Aug; 37(9):2047-56.