{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,1]],"date-time":"2026-04-01T02:34:49Z","timestamp":1775010889680,"version":"3.50.1"},"reference-count":79,"publisher":"MIT Press - Journals","issue":"9","license":[{"start":{"date-parts":[[2020,10,30]],"date-time":"2020-10-30T00:00:00Z","timestamp":1604016000000},"content-version":"vor","delay-in-days":1155,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["direct.mit.edu"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2017,9,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Adaptive working memory (WM) training may lead to cognitive benefits that are associated with white matter plasticity in parietofrontal networks, but the underlying mechanisms remain poorly understood. We investigated white matter microstructural changes after adaptive WM training relative to a nonadaptive comparison group. Microstructural changes were studied in the superior longitudinal fasciculus, the main parietofrontal connection, and the cingulum bundle as a comparison pathway. MRI-based metrics were the myelin water fraction and longitudinal relaxation rate R1 from multicomponent relaxometry (captured with the mcDESPOT approach) as proxy metrics of myelin, the restricted volume fraction from the composite hindered and restricted model of diffusion as an estimate of axon morphology, and fractional anisotropy and radial diffusivity from diffusion tensor imaging. PCA was used for dimensionality reduction. Adaptive training was associated with benefits in a \u201cWM capacity\u201d component and increases in a microstructural component (increases in R1, restricted volume fraction, fractional anisotropy, and reduced radial diffusivity) that predominantly loaded on changes in the right dorsolateral superior longitudinal fasciculus and the left parahippocampal cingulum. In contrast, nonadaptive comparison activities were associated with the opposite pattern of reductions in WM capacity and microstructure. No group differences were observed for the myelin water fraction metric suggesting that R1 was a more sensitive \u201cmyelin\u201d index. These results demonstrate task complexity and location-specific white matter microstructural changes that are consistent with tissue alterations underlying myelination in response to training.<\/jats:p>","DOI":"10.1162\/jocn_a_01127","type":"journal-article","created":{"date-parts":[[2017,3,30]],"date-time":"2017-03-30T16:12:39Z","timestamp":1490890359000},"page":"1509-1520","update-policy":"https:\/\/doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":72,"title":["Dynamics of White Matter Plasticity Underlying Working Memory Training: Multimodal Evidence from Diffusion MRI and Relaxometry"],"prefix":"10.1162","volume":"29","author":[{"given":"Claudia","family":"Metzler-Baddeley","sequence":"first","affiliation":[{"name":"Cardiff University, Brain Research Imaging Centre (CUBRIC)"}]},{"given":"Sonya","family":"Foley","sequence":"additional","affiliation":[{"name":"Cardiff University, Brain Research Imaging Centre (CUBRIC)"}]},{"given":"Silvia","family":"de Santis","sequence":"additional","affiliation":[{"name":"University Miguel Hernandez, Alicante, Spain"}]},{"given":"Cyril","family":"Charron","sequence":"additional","affiliation":[{"name":"Cardiff University, Brain Research Imaging Centre (CUBRIC)"}]},{"given":"Adam","family":"Hampshire","sequence":"additional","affiliation":[{"name":"Imperial College London"}]},{"given":"Karen","family":"Caeyenberghs","sequence":"additional","affiliation":[{"name":"Australian Catholic University"}]},{"given":"Derek K.","family":"Jones","sequence":"additional","affiliation":[{"name":"Cardiff University, Brain Research Imaging Centre (CUBRIC)"},{"name":"Australian Catholic University"}]}],"member":"281","published-online":{"date-parts":[[2017,9,1]]},"reference":[{"key":"2021073021105669700_R1","doi-asserted-by":"crossref","first-page":"423","DOI":"10.1089\/brain.2011.0071","article-title":"Characterization of cerebral white matter properties using quantitative 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