A new study suggests that people who have left-brain dominance tend to put their mobile phones to their right ear, and the opposite is true for those with right-brain dominance.
The research was conducted by Henry Ford Health System in Michigan. They found that around 70 percent of 700 people surveyed held their phones up to the ear that was on the side of their dominant hand.
Most of the human population is left-brain dominant, meaning they use their right hand to write. Whichever side a person is dominant on indicates where their speech and language center is located.
The study will likely help physicians locate a person's language center before brain surgery.
"In essence, this could be used as a poor man's Wada test," author of the study Dr. Michael Seidman said. The Wada test is a standard test that determines where a patient's language center is.
Seidman said determining how a person talks on their phone is an easy way to determine where their communication center is in their brain.
He said Wada tests are invasive and risky, and are not a guarantee. Observing how a person uses their phone gives "shorthand insight into brain dominance."
Ninety percent of those surveyed were right-handed, and 68 percent of them used their right ear when talking on the phone. Twenty five person used their left ear and seven percent used both.
For the left-handed people, 72 percent used their left ear, 23 percent used their right ear and five percent used both.