The temporary release of serotonin has been found to facilitate memory formation, and the temporary release of stress hormones has been found to facilitate memory formation.
Explanation:
Both serotonin and stress hormones have been proven to ease the formation of memory. Serotonin is found in the enteric nervous system, the central nervous system, and also stored in blood platelets; while stress hormones such as cortisol and adrenalin are produced by the adrenal gland when stimulated by either the hyphotalamus or the sympathetic nervous system.
