Vestigial Ear Muscles Activate During Effortful Listening

A new study reveals that human auricular muscles, once used to move our ears, reactivate during challenging listening tasks. Scientists used electromyography to measure muscle activity while participants listened to audiobooks with competing sounds. The results showed increased activity in the superior auricular muscles when hearing was difficult, suggesting these vestigial muscles may play a role in attentional mechanisms. While the muscle movements are minuscule and likely don't improve hearing, their activation could serve as an objective measure of listening effort.