Fig. 4.

Results of Independent Components Analysis (ICA). After denoising, four components were an ideal fit for the data. The first component and its significant associations are shown here. Results indicate that, with increasing beta weight on Factor 1 – Blast Exposure, tracer uptake appears more like the map shown (e.g., with increasing numbers of blasts, more tracer uptake is expected in the inferior cerebellum and lateral occipital regions, but less in the anterior lobe of the cerebellum). Panel B shows a scatter plot of ICA component scores and beta weights for Factor 1 – Blast Exposure. The remaining three components from the ICA analysis and the remaining 11 scatter plots comparing component scores to factor beta weights are included in the supplemental materials. Note: The scatter plot displays the unranked factor beta weights, although statistics were completed using rank transforms.