Heart stimulation (IMAGE) University of California - San Diego Caption An image of a heart labeled by vagal sensory neurons. In a new study published in the journal Nature, UC San Diego researchers and their colleagues found that these neurons trigger fainting, laying a foundation for addressing fainting-related disorders. Credit Augustine Lab, UC San Diego Usage Restrictions Must be used in conjunction with UC San Diego study on sensory neurons tied to fainting. License Original 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.