scholarly journals Directional changes in information flow between human brain cortical regions after application of anodal transcranial direct current stimulation (tDCS) over Broca’s area

2018 ◽  
Vol 9 (11) ◽  
pp. 5296 ◽  
Author(s):  
Jianwei Cao ◽  
Xinlong Wang ◽  
Hanli Liu ◽  
George Alexandrakis
Keyword(s):  
Human Brain ◽  
Information Flow ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Broca’S Area ◽  
Broca's Area ◽  
Direct Current Stimulation ◽  
Cortical Regions

Transcranial direct current stimulation (tDCS) of Broca's area in chronic aphasia: A controlled outcome study

2013 ◽  
Vol 247 ◽  
pp. 211-216 ◽  
Author(s):  
Chiara Volpato ◽  
Marianna Cavinato ◽  
Francesco Piccione ◽  
Martina Garzon ◽  
Francesca Meneghello ◽  
...  
Keyword(s):  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Outcome Study ◽  
Broca’S Area ◽  
Broca's Area ◽  
Direct Current Stimulation ◽  
Chronic Aphasia

Effects of Transcranial Direct Current Stimulation on Apraxia of Speech and Cortical Activation in Patients With Stroke: A Randomized Sham-Controlled Study

2019 ◽  
Vol 28 (4) ◽  
pp. 1625-1637 ◽  
Author(s):  
Jie Wang ◽  
Dongyu Wu ◽  
Yinan Cheng ◽  
Weiqun Song ◽  
Ying Yuan ◽  
...  
Keyword(s):  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Primary Motor Cortex ◽  
Approximate Entropy ◽  
Cortical Activation ◽  
Controlled Study ◽  
Broca’S Area ◽  
Apraxia Of Speech ◽  
Broca's Area ◽  
Direct Current Stimulation

Purpose The study aims to investigate, using anodal transcranial direct current stimulation (A-tDCS), over which site, the left lip region of primary motor cortex (M1) or the Broca's area, there would be better recovery from apraxia of speech (AoS) in patients with poststroke aphasia and to examine for altered activation in speech-related areas after tDCS with nonlinear electroencephalography (EEG). Method Fifty-two patients with AoS were randomized into A-tDCS over the left M1 (A-tDCS-M1), Broca's area, and sham tDCS groups who underwent 10 sessions of tDCS and speech treatment for 5 days. The EEG nonlinear index of approximate entropy was calculated for 6 subjects in each group before and after treatment. Results After treatment, the change in speech-language performance improved more significantly in the A-tDCS-M1 group than the other 2 groups ( p < .05). EEG approximate entropy indicated that both A-tDCS groups could activate the stimulated sites; the improvement in the A-tDCS-M1 group was correlated with high activation in the dorsal lateral prefrontal cortex and Broca's areas of the left hemisphere in addition to the stimulated site. Conclusion A-tDCS over the left M1 can improve the speech function in patients with poststroke aphasia and severe AoS and excite and recruit more areas in the motor speech network.

Bilateral Transcranial Direct Current Stimulation Language Treatment Enhances Functional Connectivity in the Left Hemisphere: Preliminary Data from Aphasia

2016 ◽  
Vol 28 (5) ◽  
pp. 724-738 ◽  
Author(s):  
Paola Marangolo ◽  
Valentina Fiori ◽  
Umberto Sabatini ◽  
Giada De Pasquale ◽  
Carmela Razzano ◽  
...  
Keyword(s):  
Functional Connectivity ◽  
Left Hemisphere ◽  
Direct Current ◽  
Transcranial Direct Current Stimulation ◽  
Broca’S Area ◽  
Broca's Area ◽  
Direct Current Stimulation ◽  
Sham Condition ◽  
Study Results ◽  
The Right

Several studies have already shown that transcranial direct current stimulation (tDCS) is a useful tool for enhancing recovery in aphasia. However, no reports to date have investigated functional connectivity changes on cortical activity because of tDCS language treatment. Here, nine aphasic persons with articulatory disorders underwent an intensive language therapy in two different conditions: bilateral anodic stimulation over the left Broca's area and cathodic contralesional stimulation over the right homologue of Broca's area and a sham condition. The language treatment lasted 3 weeks (Monday to Friday, 15 sessions). In all patients, language measures were collected before (T0) and at the end of treatment (T15). Before and after each treatment condition (real vs. sham), each participant underwent a resting-state fMRI study. Results showed that, after real stimulation, patients exhibited the greatest recovery not only in terms of better accuracy in articulating the treated stimuli but also for untreated items on different tasks of the language test. Moreover, although after the sham condition connectivity changes were confined to the right brain hemisphere, real stimulation yielded to stronger functional connectivity increase in the left hemisphere. In conclusion, our data provide converging evidence from behavioral and functional imaging data that bilateral tDCS determines functional connectivity changes within the lesioned hemisphere, enhancing the language recovery process in stroke patients.

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