--Original published at Ashley's Psyche
As the name may suggest, the MythBusters are a group of people who perform a variety of televised experiments to prove whether widely known statements are true from a scientific viewpoint, or whether they are not. In an episode that I have just recently watched, the MythBusters were testing whether yawning is contagious or not.
To test this theory, the MythBusters created a pop-up structure in public that consisted of three identical rooms. As the test subjects, who believed that they would be waiting for an audition, were ushered in their rooms, one of the MythBusters would yawn in front of two of them, and then shut the door. The third test subject would not be yawned in front of, as he or she would be considered the control. They did this for fifty different people and recorded their results.
From this experiment the MythBusters concluded that yawning is contagious, as there was a four percent difference in yawning that happened between those that received the stimulus and those that did not. However, I would like to disagree. I believe that there were many confounding variables that influenced the MythBusters’ experiment.
This is not to say that the MythBusters did not have many strongpoints in their experiment. Their sample size was large, which lowers the chances of bias. They isolated each of the test subjects, meaning that one subject could not influence another subject in any way. They did not inform the test subjects about the experiment being performed, therefore the subjects were not thinking about yawning and influencing the experiment in that retrospect. And the MythBusters had a control in which they could compare the results of the other two subjects with.
Nevertheless, there seemed to be some confounding variables that the MythBusters did not take into account. The two most notable for me were that each of the subjects may have had a differing amount of sleep the night before, as well as that each of the subjects may have been having a reaction to the room, and not to the MythBuster yawning.
The amount of sleep each of the subjects had the night before can be considered a confounding variable as the less sleep one subject got, the more prone to yawning they are likely to be. In order to eliminate this variable, the MythBusters should have either recorded an average amount of sleep that each person got the night before to reference later, or split up each of the subjects in to categories based on their hours of sleep.
As well, the issue of the color and décor of the room could be a confounding variable. Different colors and amounts of space are known to influence the brain and its attentiveness. A plain white room may have caused many of the subjects to become bored or tired, which would explain why they eventually yawned while waiting. To correct this confounding variable, I would suggest that the MythBusters have rooms set up with different colors and decorations, and then some that have nothing at all, in order to compare the amount of yawns that happen in each.
I would be very interested to see the results of the MythBusters’ experiment if they took my suggestions into account. I feel as though they would come to a very different conclusion than the one they did during their test.