Hearing Results for the Early Hominins (IMAGE) Binghamton University Caption These are hearing results for the early hominins. Points higher on the curve indicate greater auditory sensitivity. Note the sharp dropoff in sensitivity above about 3 kHz. Credit Rolf Quam Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.