Editorial Note: We earn a commission from partner links on Forbes Advisor. Commissions do not affect our editors' opinions or evaluations. Disclaimer: Calculator results and default inputs are ...

Steven Nickolas is a writer and has 10+ years of experience working as a consultant to retail and institutional investors. Katharine Beer is a writer, editor, and archivist based in New York. She has ...

Steven Nickolas is a writer and has 10+ years of experience working as a consultant to retail and institutional investors. Ebony Howard is a certified public accountant and a QuickBooks ProAdvisor tax ...

Learn more about eLife assessments Blood flow to the brain is a sensitive marker of neuronal activity as well as of a number of diseases, including stroke, tumours and neurodegenerative conditions.