Which of the following statements regarding yawning is LEAST accurate?
A) Yawning is seen in all cultures.
B) Yawning is a response to a buildup of carbon dioxide.
C) Yawning is correlated with sleepiness and boredom.
D) Yawning is seen in other mammals, as well as in birds, fish, and reptiles.

Question

Quizplus · Accepted Answer

While it was long believed that yawning was a response to a buildup of carbon dioxide, recent research has suggested that its exact cause is still not fully understood. Other possible factors that may trigger yawning include changes in brain temperature, boredom, stress, fatigue, and even social cues.

Which of the Following Statements Regarding Yawning Is LEAST Accurate