If the Brain is Exposed to Many New Sensations (image) University of Bonn Share Print E-Mail Caption Certain nerve cells, via their appendages, the axons (green in the image), release acetylcholine into the hippocampus. The astrocytes (red) react to this by releasing the neurotransmitter glutamate. As a result, memory switches into memorization mode. Credit (c) Photo: Milan Pabst & Oliver Braganza/University of Bonn Usage Restrictions This photo may be used with the press release. Share Print E-Mail 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.