Fig. 2

MRI image quality measures. (a) Visual inspection quality control (QC) ratings (pass, warn, fail) for the anatomical scans collected at session 1 and 2 (ses-01, ses-02). A pass rating denotes images show clear grey/white matter contrast and are free of motion or ringing artefacts. A warn rating indicates images show slight ringing but otherwise good grey/white matter contrast. A fail rating denotes images are severely impacted by motion or susceptibility artefacts with cortical and subcortical structures challenging to delineate clearly. (b) Violin plot showing the distribution of average absolute motion in mm (i.e., displacement relative to the first volume; lower values are better) for diffusion scans at session 1 and 2. The lower and upper hinges of the box plot represent the first quartile and third quartiles, respectively, and the horizontal line within the box represents the median. Outliers (1.5 times the interquartile range) are represented as individual data points. The median across participants of average absolute motion was similar between sessions 1 and 2 (0.77 mm and 0.76 mm, respectively). (c) Violin plot of the percentage of total slices classified as outliers (i.e., slices affected by severe signal dropout; lower values are better) for diffusion scans at sessions 1 and 2. The median percentage of total outlier slices was greater at session 1 (1.18%) than session 2 (1.01%). (d) Violin plot showing the distribution of average Framewise Displacement (FD) head motion in mm for resting-state and task fMRI scans (lower values are better); participants with mean FD greater than 1 mm not shown (rest session 1: 15 participants, rest session 2: 1 participant, emotional conflict: 4 participants). The median across participants of average FD was lowest for the Partly Cloudy movie-watching scan (0.16 mm) compared to the rest and emotional conflict task scans (0.18–0.21 mm).