Surprising Study: Eye Closure Impairs Hearing

A recent study challenges the common assumption that closing one's eyes enhances hearing sensitivity. Contrary to popular belief, researchers discovered that this action actually impairs the ability to detect faint sounds, particularly in environments with background noise. The investigation, published in JASA, involved participants adjusting sound volumes to overcome ambient noise under various visual conditions.

Results indicated that participants performed worse with their eyes closed. Conversely, viewing a video that synchronized with the sounds significantly boosted their hearing capabilities. This suggests that relevant visual input offers a clear advantage for auditory perception in noisy settings.

Electroencephalography (EEG) data revealed that closing eyes induces a state of neural criticality, causing the brain to filter incoming information more intensely. This over-filtering can suppress not only background noise but also the intended sounds. Visual engagement, on the other hand, helps anchor the auditory system.

While closing eyes might still be beneficial in very quiet conditions, the findings emphasize the advantage of keeping eyes open in everyday noisy scenarios. Future research aims to pinpoint whether the benefit stems from any visual input or specifically from congruent audio-visual information.