Figure 2

Mean and standard deviation of the similarity of acceleration between each sensor. The heatmaps of AAC (a–d) and SD (e–h) are shown for each condition (EO and EC). In the heat map of AAC, the left vertical and horizontal axes are the sensor numbers and the right vertical axis is the similarity. In the heat map of SD, the left vertical and horizontal axes are the sensor numbers and the right vertical axis is the standard deviation value. AAC: average acceleration correlation, SD: standard deviation, ML: medial–lateral direction, AP: anterior–posterior direction, EO: eye-opening condition, EC: eye-closing condition.