Fig. 4

Participant head motion measurement. Head motion measurement estimated from the rigid-body co-registration between the 49 interspersed b = 0 image volumes and the first b = 0 image volume of a representative participant, quantified in the translation along the left-right (L-R), anterior-posterior (A-P), superior and inferior (S-I) direction (row a), as well as the rotation around the L-R axis (pitch), A-P axis (roll) and S-I axis (yaw) (row b). The temporally averaged absolute values of head motion parameters are used to reflect the overall head motion of each participant (rows c, d).