Serotonin causes neuromodulation.
 However, it is known that while serotonin is involved in stress and behavioral responses, it is also important in cognitive functions
==== Receptors ====The 5-HT receptors, the receptors for serotonin, are located on the cell membrane of nerve cells and other cell types in animals, and mediate the effects of serotonin as the endogenous ligand and of a broad range of pharmaceutical and psychedelic drugs

