Assertion: yawning | /r/HasProperty | triggered by fluctuation
Facets:
value: often
type: TEMPORAL
value: in humans
type: OTHER
value: in cortisol
type: OTHER
Source sentences:
text: These provide support for the proposal that yawning is triggered by fluctuations in cortisol which affect the hypothalamus in order to facilitate brain cooling .
text: In humans, yawning is often triggered by the perception that others are yawning (for example, seeing a person yawning, or talking to someone on the phone who is yawning).