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We measured cortical activity and tremor magnitude at low and high feedback conditions. Cortical activity was measured using high\u2010density electroencephalogram and isolated using source localization.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Changes in power across feedback in the 4\u201312\u2009Hz and 12\u201330\u2009Hz bands were reduced within the contralateral motor cortex of essential tremor patients compared to controls. The 12\u201330\u2009Hz bidirectional connectivity between the parietal and contralateral motor cortex was decreased in essential tremor patients. Worsening of tremor from low to high visual feedback was associated with 4\u201312\u2009Hz activity in contralateral motor cortex. The greatest separation between groups was found when using the difference of the contralateral motor cortex activity at high and low feedback, rather than either feedback condition alone.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Our findings provide new evidence that tremor in essential tremor is associated with reduced power across feedback in the motor cortex and reduced connectivity between the parietal and motor cortices. Combined with previous work on the cerebellar\u2010thalamo\u2010cortical motor circuit, our findings suggest that the network level disturbances associated with essential tremor extend to the cortico\u2010cortical pathway between the parietal cortex and motor cortex. \u00a9 2018 International Parkinson and Movement Disorder Society<\/jats:p><\/jats:sec>","DOI":"10.1002\/mds.27522","type":"journal-article","created":{"date-parts":[[2018,10,22]],"date-time":"2018-10-22T00:51:25Z","timestamp":1540169485000},"page":"95-104","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Cortical dynamics within and between parietal and motor cortex in essential tremor"],"prefix":"10.1002","volume":"34","author":[{"given":"Arnab","family":"Roy","sequence":"first","affiliation":[{"name":"Department of Applied Physiology and Kinesiology University of Florida  Gainesville Florida 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