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However, the neurobiological mechanisms underlying fatigue are not fully understood. Here we studied lesion locations and their connections in individuals with MS, aiming to identify brain networks associated with fatigue.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      38 MS patients with and 21 without fatigue were included in the study. Association between fatigue and lesion locations was investigated using voxel\u2010lesion symptom mapping and lesion connectivity using lesion network mapping. The findings were tested in two independent datasets, including (1) MS patients scanned using resting\u2010state functional connectivity MRI (rs\u2010fcMRI) (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u2009199) and (2) individuals with stroke lesions (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200985).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      There were no specific anatomical MS lesion locations significantly associated with fatigue, but lesions associated with fatigue were connected to a common network with peak positive connectivity to the right premotor cortex and negative connectivity to the left temporal pole (\n                      <jats:italic>p<\/jats:italic>\n                      <jats:sub>FWE<\/jats:sub>\n                      &lt;\u20090.05). Of the two identified network nodes, connectivity from the premotor cortex to multiple other brain regions was significantly associated with MS fatigue severity in the independent dataset of MS patients (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05). The MS fatigue network was also reproducible in poststroke fatigue (spatial correlation\n                      <jats:italic>r<\/jats:italic>\n                      \u2009=\u20090.57, permutation test\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.02), again showing that lesion connectivity to the premotor cortex, but not the temporal pole, was associated with fatigue (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.04).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Our results show that fatigue in MS localizes to a brain network, lending insight into the neural substrates of fatigue.<\/jats:p>\n                  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