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Soroush Ahmadi Machiani1 
, Sajjad Rezaei2 , Alia Saberi3 , Arman Keymoradzadeh1 , Babak Bakhshayesh1 , Kambiz Rohampour * 1
, Sajjad Rezaei2 , Alia Saberi3 , Arman Keymoradzadeh1 , Babak Bakhshayesh1 , Kambiz Rohampour * 1
1- Neuroscience Research Center, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran
2- Department of Psychology, Faculty of Literature and Humanities, University of Guilan, Rasht, Iran
3- Department of Neurology, Poursina Hospital, Guilan University of Medical Sciences, Rasht, Iran
2- Department of Psychology, Faculty of Literature and Humanities, University of Guilan, Rasht, Iran
3- Department of Neurology, Poursina Hospital, Guilan University of Medical Sciences, Rasht, Iran
Abstract:
Mild cognitive impairment (MCI) is a transitional state between normal aging and dementia. Bi-hemispheric transcranial direct current stimulation (tDCS) modulates cortical excitability and interhemispheric interaction. The dorsolateral prefrontal cortex (DLPFC), is involved in executive control and working memory. The present study aimed to investigate whether stimulating the left DLPFC while suppressing the right DLPFC can influence brain waves and cognitive abilities in patients with MCI.
Thirty-six MCI patients were randomly allocated into active and sham tDCS groups. Ten sessions of active or sham tDCS were applied. The anode electrode was placed on the left DLPFC (F3) and the cathode on the right (F4). Memory assessment was performed by the Wechsler Memory Scale-Revised (WMS-R) before, immediately after, and three months after the intervention. Resting-state electroencephalography were performed before and immediately after tDCS. The absolute and relative powers of different frequency bands and the coherence between electrodes were calculated using the Neurogiude software.
Active tDCS improved the memory quotient and all WMS-R subscales in MCI patients immediately and three months after tDCS application (P<0.01). The absolute power of the delta band and the relative power of the delta and theta bands reduced significantly (P<0.05). The relative alpha band power and fronto-temporal coherence were increased. A frontal asymmetry was also detected after active tDCS.
Bi-hemispheric tDCS of the DLPFC leads to sustained cognitive improvements and beneficial changes in brain activity in MCI patients, suggesting its potential as an effective therapeutic intervention.
Thirty-six MCI patients were randomly allocated into active and sham tDCS groups. Ten sessions of active or sham tDCS were applied. The anode electrode was placed on the left DLPFC (F3) and the cathode on the right (F4). Memory assessment was performed by the Wechsler Memory Scale-Revised (WMS-R) before, immediately after, and three months after the intervention. Resting-state electroencephalography were performed before and immediately after tDCS. The absolute and relative powers of different frequency bands and the coherence between electrodes were calculated using the Neurogiude software.
Active tDCS improved the memory quotient and all WMS-R subscales in MCI patients immediately and three months after tDCS application (P<0.01). The absolute power of the delta band and the relative power of the delta and theta bands reduced significantly (P<0.05). The relative alpha band power and fronto-temporal coherence were increased. A frontal asymmetry was also detected after active tDCS.
Bi-hemispheric tDCS of the DLPFC leads to sustained cognitive improvements and beneficial changes in brain activity in MCI patients, suggesting its potential as an effective therapeutic intervention.
Keywords: Mild cognitive impairment, Electroencephalography (EEG), Transcranial direct current stimulation (tDCS), Wechsler memory scale, Coherence
Type of Study: Original |
Subject:
Cognitive Neuroscience
Received: 2024/02/16 | Accepted: 2024/07/29
Received: 2024/02/16 | Accepted: 2024/07/29
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