the act of pulling in a volume of air via the mouth which is much bigger than that inspired in typical respiration, serving to enhance oxygen that goes to the brain. Some findings imply that yawning is mediated by the same neurotransmitters inside the brain which impact feelings, disposition, hunger, etc.

YAWNING: "Candice was asked to leave class because she was yawning too often. "
Cite this page: N., Pam M.S., "YAWNING," in PsychologyDictionary.org, April 29, 2013, https://psychologydictionary.org/yawning/ (accessed September 25, 2021).