Owen Gilbert (IMAGE) Pensoft Publishers Caption Dr Owen Gilbert, researcher at the Department of Integrative Biology at the University of Texas at Austin (USA) and author of the recent paper suggesting the natural reward theory of evolution. Credit LE Gilbert Usage Restrictions CC-BY 4.0 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.