Spontaneous dopamine pulses (image) University of California - San Diego Share Print E-Mail Caption UC San Diego researchers and their colleagues have discovered that spontaneous impulses of dopamine, the neurological messenger known as the brain's "feel good" chemical, occur in the brains of mice. Credit Julia Kuhl Usage Restrictions Must be used in conjunction with Current Biology paper on dopamine pulses in mice. 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.