olfactory-neurons copy.jpg (IMAGE) University of California - Santa Barbara Caption Under the previous model (top), an odor would activate an increasing number of olfactory sensory neurons as it’s concentration rose. The new findings (bottom) showed that the activity of the most sensitive neurons fell off as others joined. Credit Photo Credit: TADRES ET AL. Usage Restrictions For use with Credit. 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.