Visual centers (IMAGE) Weizmann Institute of Science Caption The visual centers in those seeing a film or imagining as instructed had similar timing in their brain activity, while those experiencing spontaneous hallucinations showed a gradual increase in slow fluctuations Credit The Weizmann Institute of Science 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.