scholarly journals Transcranial Direct Current Stimulation over the Right Inferior Parietal Cortex Reduces Transposition Errors in a Syllabic Reordering Task

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2077
Author(s):  
Vanessa Costa ◽  
Giuseppe Giglia ◽  
Simona Talamanca ◽  
Chiara Finocchiaro ◽  
Giuseppe Cosentino ◽  
...  
Keyword(s):  
Language Processing ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Right Hemisphere ◽  
Parietal Lobe ◽  
Brain Lesion ◽  
Direct Current Stimulation ◽  
Anodal Stimulation ◽  
Left And Right ◽  
The Right

Evidence derived from functional imaging and brain-lesion studies has shown a strong left lateralization for language, and a complementary right hemisphere dominance for visuospatial abilities. Nevertheless, the symmetrical functional division of the two hemispheres gives no reason for the complexity of the cognitive operations involved in carrying out a linguistic task. In fact, a growing number of neuroimaging and neurostimulation studies suggest a possible right hemisphere involvement in language processing. The objective of this work was to verify the contribution of the left and right parietal areas in a phonological task. We applied anodal transcranial direct current stimulation (tDCS) to the right or left inferior parietal lobe, during a syllabic reordering task. After having learnt a combination of images of real objects and trisyllabic pseudowords with a simple consonant–vowel (CV) syllabic structure (e.g., tu-ru-cu), participants were shown the same images paired to two different pseudowords: one correct but with transposed syllables, and one alternative, never before seen. The participant’s task was to orally produce the chosen pseudoword, after having rearranged the order of its syllables. Two types of error were considered: transposition (correct pseudoword but incorrectly reordered) and identity (incorrect pseudoword). The results showed that right anodal stimulation significantly reduced the number of transposition errors, whereas left anodal stimulation significantly reduced the number of identity errors. These results suggested that both left and right inferior parietal areas were differentially involved in a syllabic reordering task, and, crucially, they demonstrated that visuospatial processes served by the right inferior parietal area could be competent for establishing the correct syllabic order within a word.

scholarly journals Taking Sides: An Integrative Review of the Impact of Laterality and Polarity on Efficacy of Therapeutic Transcranial Direct Current Stimulation for Anomia in Chronic Poststroke Aphasia

2016 ◽  
Vol 2016 ◽  
pp. 1-21 ◽  
Author(s):  
Margaret Sandars ◽  
Lauren Cloutman ◽  
Anna M. Woollams
Keyword(s):  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Language Production ◽  
Right Hemisphere ◽  
Combined Therapy ◽  
Future Research ◽  
Language Therapy ◽  
Direct Current Stimulation ◽  
The Right ◽  
The Impact

Anomia is a frequent and persistent symptom of poststroke aphasia, resulting from damage to areas of the brain involved in language production. Cortical neuroplasticity plays a significant role in language recovery following stroke and can be facilitated by behavioral speech and language therapy. Recent research suggests that complementing therapy with neurostimulation techniques may enhance functional gains, even amongst those with chronic aphasia. The current review focuses on the use of transcranial Direct Current Stimulation (tDCS) as an adjunct to naming therapy for individuals with chronic poststroke aphasia. Our survey of the literature indicates that combining therapy with anodal (excitatory) stimulation to the left hemisphere and/or cathodal (inhibitory) stimulation to the right hemisphere can increase both naming accuracy and speed when compared to the effects of therapy alone. However, the benefits of tDCS as a complement to therapy have not been yet systematically investigated with respect to site and polarity of stimulation. Recommendations for future research to help determine optimal protocols for combined therapy and tDCS are outlined.

Anodal transcranial direct current stimulation over the right hemisphere improves auditory comprehension in a case of dementia

2017 ◽  
Vol 41 (2) ◽  
pp. 567-575 ◽  
Author(s):  
Vanessa Costa ◽  
Filippo Brighina ◽  
Tommaso Piccoli ◽  
Sabrina Realmuto ◽  
Brigida Fierro
Keyword(s):  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Right Hemisphere ◽  
Auditory Comprehension ◽  
Direct Current Stimulation ◽  
The Right

scholarly journals Prefrontal Transcranial Direct Current Stimulation Globally Improves Learning but Does Not Selectively Potentiate the Benefits of Targeted Memory Reactivation on Awake Memory Consolidation

2021 ◽  
Vol 11 (8) ◽  
pp. 1104
Author(s):  
Médhi Gilson ◽  
Michael A. Nitsche ◽  
Philippe Peigneux
Keyword(s):  
Direct Current ◽  
Memory Consolidation ◽  
Transcranial Direct Current Stimulation ◽  
Specific Effect ◽  
Memory Reactivation ◽  
Direct Current Stimulation ◽  
Beneficial Effects ◽  
Anodal Stimulation ◽  
The Right ◽  
Stimulation Of

Targeted memory reactivation (TMR) and transcranial direct current stimulation (tDCS) can enhance memory consolidation. It is currently unknown whether TMR reinforced by simultaneous tDCS has superior efficacy. In this study, we investigated the complementary effect of TMR and bilateral tDCS on the consolidation of emotionally neutral and negative declarative memories. Participants learned neutral and negative word pairs. Each word pair was presented with an emotionally compatible sound. Following learning, participants spent a 20 min retention interval awake under four possible conditions: (1) TMR alone (i.e., replay of 50% of the associated sounds), (2) TMR combined with anodal stimulation of the left DLPFC, (3) TMR combined with anodal stimulation of the right DLPFC and (4) TMR with sham tDCS. Results evidenced selective memory enhancement for the replayed stimuli in the TMR-only and TMR-sham conditions, which confirms a specific effect of TMR on memory. However, memory was enhanced at higher levels for all learned items (irrespective of TMR) in the TMR-anodal right and TMR-anodal left tDCS conditions, suggesting that the beneficial effects of tDCS overshadow the specific effects of TMR. Emotionally negative memories were not modulated by tDCS hemispheric polarity. We conclude that electrical stimulation of the DLPFC during the post-learning period globally benefits memory consolidation but does not potentiate the specific benefits of TMR.

scholarly journals Transcranial Direct Current Stimulation Combining Mindfulness-Based Relapse Prevention for Smoking Cessation: A Case Report

2019 ◽  
Vol 6 (3) ◽  
pp. 118-122
Author(s):  
Zahra Khayyer ◽  
Razieh Saberi Azad ◽  
Mohsen Dadjoo ◽  
Azam Shojaei
Keyword(s):  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Relapse Prevention ◽  
Brain Activity ◽  
Substantial Reduction ◽  
Central Zone ◽  
Efficient Treatment ◽  
Direct Current Stimulation ◽  
Anodal Stimulation ◽  
The Right

Previous electroencephalography (EEG) researches have shown significant differences in terms of abnormal brain activity among smokers and non-smokers. Typically, EEG analysis showed decreased slow waves and increased fast waves in people with nicotine consumption. The present study tested a transcranial direct current stimulation (tDCS) technique combined with Mindfulness-based relapse prevention (MBRP) to reduce nicotine cravings. Specifically, cathodal tDCS over left prefrontal cortex (PFC), as well as anodal stimulation over the right central zone, tested. An 18-year-old right-handed male with almost 3 years of smoking participated. He had no anti-tobacco medical prescription. The participant received twelve sessions of tDCS treatment (2 times a week). Anodal stimulation (1.5 mA, 15 minutes) performed on C3 (LORETA source localization) and cathodal stimulation on FP2. Also, the participant received 30-minute MBRP-based psychotherapy sessions in order to ameliorate aggression, stress, and craving. Clinical evaluations, Buss-Perry Aggression Questionnaire (AGQ), Fagerstrom Test for Nicotine Dependence (FTND), Perceived Stress Scale (Cohen, Kamarck, & Mermelstein, 1994), and daily checklist for the number of smoked cigarettes administered along with carbon monoxide (CO) levels. Also, subjective measures of craving intensity between zero and ten measured after treatment and 3-month follow-up. After treatment, the participant showed a substantial reduction in all clinical tests, and the number of cigarettes decreased from 30 to 2 a day. From a psycho neurotherapeutic perspective, the present study provides preliminary indications for a novel and efficient treatment of smoking during adolescence. Further studies are needed to determine generalizability and overall efficiency.

scholarly journals Prefrontal Transcranial Direct Current Stimulation globally improves learning, but does not selectively potentiate the benefits of Targeted Memory Reactivation on awake memory consolidation

2020 ◽  
Author(s):  
Médhi Gilson ◽  
Michael A. Nitsche ◽  
Philippe Peigneux
Keyword(s):  
Direct Current ◽  
Memory Consolidation ◽  
Transcranial Direct Current Stimulation ◽  
Specific Effect ◽  
Memory Reactivation ◽  
Direct Current Stimulation ◽  
Beneficial Effects ◽  
Anodal Stimulation ◽  
The Right ◽  
Stimulation Of

AbstractTargeted Memory Reactivation (TMR) and transcranial Direct Current Stimulation (tDCS) can enhance memory consolidation. It is currently unknown whether TMR reinforced by simultaneous tDCS has superior efficacy. In this study, we investigated the complementary effect of TMR and bilateral tDCS on the consolidation of emotionally neutral and negative declarative memories. Participants learned neutral and negative word pairs. Each word pair was presented with an emotionally compatible sound. Following learning, participants spent a 20-minutes retention interval awake under 4 possible conditions: (1) TMR alone (i.e. replay of 50% of the associated sounds), (2) TMR combined with anodal stimulation of the left DLPFC, (3) TMR combined with anodal stimulation of the right DLPFC and (4) TMR with sham tDCS. Results evidenced selective memory enhancement for the replayed stimuli in the TMR-only and TMR-sham conditions, which confirms a specific effect of TMR on memory. However, memory was enhanced at higher levels for all learned items (irrespective of TMR) in the TMR-anodal right and TMR-anodal left tDCS conditions, suggesting that the beneficial effects of tDCS overshadow the specific effects of TMR. Emotionally negative memories were not modulated by tDCS hemispheric polarity. We conclude that electrical stimulation of the DLPFC during post-learning period globally benefits memory consolidation, but does not potentiate the specific benefits of TMR.

scholarly journals Does Transcranial Direct Current Stimulation Improve Healthy Working Memory?: A Meta-analytic Review

2016 ◽  
Vol 28 (8) ◽  
pp. 1063-1089 ◽  
Author(s):  
Lauren E. Mancuso ◽  
Irena P. Ilieva ◽  
Roy H. Hamilton ◽  
Martha J. Farah
Keyword(s):  
Working Memory ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Parietal Lobe ◽  
Meta Analysis ◽  
Direct Current Stimulation ◽  
Anodal Stimulation ◽  
Left Dlpfc ◽  
Analytic Review ◽  
Meta Analyses

Transcranial direct current stimulation (tDCS) has been reported to improve working memory (WM) performance in healthy individuals, suggesting its value as a means of cognitive enhancement. However, recent meta-analyses concluded that tDCS has little or no effect on WM in healthy participants. In this article, we review reasons why these meta-analyses may have underestimated the effect of tDCS on WM and report a more comprehensive and arguably more sensitive meta-analysis. Consistent with our interest in enhancement, we focused on anodal stimulation. Thirty-one articles matched inclusion criteria and were included in four primary meta-analyses assessing the WM effects of anodal stimulation over the left and right dorsolateral pFC (DLPFC) and right parietal lobe as well as left DLPFC stimulation coupled with WM training. These analyses revealed a small but significant effect of left DLPFC stimulation coupled with WM training. Left DLPFC stimulation alone also enhanced WM performance, but the effect was reduced to nonsignificance after correction for publication bias. No other effects were significant, including a variety of tested moderators. Additional meta-analyses were undertaken with study selection criteria based on previous meta-analyses, to reassess the findings from these studies using the analytic methods of this study. These analyses revealed a mix of significant and nonsignificant small effects. We conclude that the primary WM enhancement potential of tDCS probably lies in its use during training.

Cerebellar, but not Motor or Parietal, High-Density Anodal Transcranial Direct Current Stimulation Facilitates Motor Adaptation

2016 ◽  
Vol 22 (9) ◽  
pp. 928-936 ◽  
Author(s):  
Michael Doppelmayr ◽  
Nils Henrik Pixa ◽  
Fabian Steinberg
Keyword(s):  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Motor Adaptation ◽  
Double Blind Study ◽  
Single Session ◽  
High Definition ◽  
Double Blind ◽  
Direct Current Stimulation ◽  
Anodal Stimulation ◽  
The Right

AbstractObjectives: Although motor adaptation is a highly relevant process for both everyday life as well as rehabilitation many details of this process are still unresolved. To evaluate the contribution of primary motor (M1), parietal and cerebellar areas to motor adaptation processes transcranial direct current stimulation (tDCS) has been applied. We hypothesized that anodal stimulation of the cerebellum and the M1 improves the learning process in mirror drawing, a task involving fine grained and spatially well-organized hand movements. Methods: High definition tDCS (HD-tDCS) allows a focal stimulation to modulate brain processes. In a single-session double-blind study, we compared the effects of different anodal stimulation procedures. The groups received stimulation either at the cerebellum (CER), at right parietal (PAR), or at left M1, and a SHAM group was included. Participants (n=83) had to complete several mirror drawing tasks before, during, and after stimulation. They were instructed to re-trace a line in the shape of a pentagonal star as fast and accurate as possible. Tracing time (seconds) and accuracy (deviation in mm) have been evaluated. Results: The results indicated that cerebellar HD-tDCS can facilitate motor adaptation in a single session. The stimulation at M1 showed only a tendency to increase motor adaptation and these effects were visible only during the first part of the stimulation. Stimulating the right parietal area, relevant for visuospatial processing did not lead to increased performance. Conclusions: Our results suggest that motor adaptation relies to a great extent on cerebellar functions and HD-tDCS can speed up this process. (JINS, 2016, 22, 928–936)

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