Objective: We elucidated active cortical areas and their time courses during simple calculation by using whole-scalp magnetoencephalography. Methods: Twelve healthy volunteers were asked to view meaningless figures (figure viewing) or digits (digit viewing) and add single digits (calculation). The magnetic signals of the brain were measured using a helmet-shaped 122-channel neuromagne... https://www.roneverhart.com/API-1608-II-Recording-and-Mixing-Console-p17720/