If we heard and processed every sound wave traveling through the air, we could easily be overwhelmed by sensory overload. Instead, through evolution, humans have evolved to perceive sound waves within a limited range of frequency. As we age, high frequencies are usually the first to be affected by hearing loss. Those with high-frequency hearing loss may have trouble understanding female or children’s voices or distinguishing consonants such as S, F or H. An audiogram can help determine any loss of hearing perception and is the first step toward counteracting losses of inner ear function.