Video 1 (VIDEO) Hong Kong University of Science and Technology This video is under embargo. Please login to access this video. Caption In vivo 3P calcium imaging of spontaneous neuronal activity at different depths below pia of the somatosensory cortex of a CCK-GCaMP6s mouse (4-month-old) through the intact skull (110-μm thickness) with system correction only (left) and full AO correction (right). Credit HKUST Usage Restrictions N/A License Original 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.