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://foldlyers.shop/product-category/arduino-boards/