The Plasticity of Smell (IMAGE) Rockefeller University Caption During the first few days of life, chronic exposure to carbon dioxide (right) rather than air (left) alters the activity of projection neurons and interneurons in the fly brain -- research that is first to show that the olfactory system is plastic. Credit Rockefeller University 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.