Brain imaging, Alzheimer's disease (IMAGE) Karolinska Institutet Caption High accumulation of tau in the brain measured by a PET scanner was the only biomarker that could predict cognitive decline in healthy individuals, people with mild cognitive impairment and people with Alzheimer’s dementia. People with high tau levels in the brain also had high levels of amyloid plaques, while people with high levels of amyloid plaques did not necessarily have high tau levels. Credit Marco Bucci Usage Restrictions This image may only be used in connection to reports about this study. 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.