Randy Nelson (IMAGE) West Virginia University Caption In a recent survey of published animal studies, Randy Nelson -- chair of the WVU Department of Neuroscience and director of basic science research for the Rockefeller Neuroscience Institute -- and his colleagues found that time of day was often not taken into account. Disregarding the animals' circadian rhythms can hamper the reproducibility, reliability and validity of studies. Credit WVU Photo/Jennifer Shephard Usage Restrictions None 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.