Fig. 4
From: Yawning reduces facial temperature in the high-yawning subline of Sprague-Dawley rats
Representative corneal temperature changes during yawning using a thermographic camera. Serial thermographic pictures before, during and after a yawn. Black circles surrounding the cornea demonstrate the areas in which all measurements were taken. a 10 s before the onset of the yawn, the maximum (Max) temperature in the cornea was 36.3 °C. b When yawning, the Max temperature in the cornea dropped to 36.1 °C. c After 10 s, the temperature dropped even further, reaching the lowest Max temperature of 35.8 °C. d After an additional 20 s. Max temperature returned to the basal level at 36.3 °C. Temperature scale bars are on the right side of each panel