Brain on Chip (image) Max Planck Institute of Biochemistry Caption A thin tissue slice of a rat hippocampus region (top) is cultivated on a semiconductor chip with 16.384 sensory transistors per square millimetre (center, dark coloured square). Following excitation the chip maps the electrical activity of the neurons (bottom), caused by activity of synapses (red: positive, blue: negative). Credit Max Planck Institute of Biochemistry Usage Restrictions Not for advertisement; not on webpages 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.