 Abstract Diffuse Correlation Spectroscopy, DCS, is an optical technique that can measure cerebral blood flow in tissue. Long wavelength interferometric DCS, LWIDCS, improves both cerebral sensitivity and signal-to-noise ratio, senior. LWIDCS uses a longer illumination wavelength, 1064 nanometers, multispeckel, and interferometric detection to achieve improved senior compared to traditional DCS. LWIDCS demonstrated an approximate 5x improvement in senior over a single channel of LWDCS in human subjects. Equivalence was shown between LW, DCS and LWIDCS, and the feasibility of LWIDCS was demonstrated at 100 Hz and a source detector separation of 3.5 cm. This improvement in performance has the potential to enable robust measurement of cerebral hemodynamics and unlock novel use cases for DCS. This article was authored by Mitchell B. Robinson, Mark O'Renna, Nissa Nozana, and others. We are article.tv, links in the description below.