Altered executive function in the welders: A functional magnetic resonance imaging study

Jeehye Seo, Yongmin Chang, Kyung Eun Jang, Jang Woo Park, Yang Tae Kim, Sin Jae Park, Kyoung Sook Jeong, Ahro Kim, Suk Hwan Kim, Yangho Kim

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Chronic exposure to manganese (Mn) can lead to impairments in motor and cognitive functions. Several recent studies reported Mn-induced executive dysfunction. The present study compared the neural correlates of ongoing executive function of welders and healthy controls. Fifty-three welders and 44 healthy controls were enrolled. Participants were given functional magnetic resonance imaging (fMRI) scans and performed two modified versions of the Wisconsin Card Sorting Task (WCST) that differed in cognitive demand, and a task that established a high-level baseline (HLB) condition. Card Sorting Test and Word-Color Test were also used to assess executive performance. Neural activation of the bilateral superior-frontal cortex, right-inferior parietal cortex, and bilateral insula cortex were greater in healthy controls than in welders when contrasting the difficult version of the WCST with the HLB. There were also correlations between executive functions by the Card Sorting Test and Word-Color Test, and brain activation in the insula cortex using the WCST. Our results indicated that welders had altered neural processing related to executive function in the prefrontal cortex under conditions of high cognitive demand. Welders also had less activation of the insula cortex, a part of a larger network comprising the lateral prefrontal cortex and parietal cortex.

Original languageEnglish
Pages (from-to)26-34
Number of pages9
JournalNeurotoxicology and Teratology
Volume56
DOIs
StatePublished - 1 Jul 2016

Keywords

  • Executive function
  • FMRI
  • Manganese (Mn) exposure
  • Wisconsin Card Sorting Task

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