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RESEARCH PRODUCT

Combining tDCS with prismatic adaptation for non-invasive neuromodulation of the motor cortex

Daniela SmirniGiuseppa Renata ManganoMassimiliano OliveriMartina BraccoMartina BraccoPatrizia Turriziani

subject

AdultCognitive Neurosciencemedicine.medical_treatmentExperimental and Cognitive PsychologyElectromyographyTranscranial Direct Current Stimulation050105 experimental psychology03 medical and health sciencesBehavioral Neuroscience0302 clinical medicineNeuromodulationHomeostatic plasticityAdaptation PsychologicalMetaplasticityNeuroplasticitytDCS TMS prismatic adaptation motor cortexmedicineHumans0501 psychology and cognitive sciencesMuscle SkeletalLensesAnalysis of VarianceNeuronal PlasticitySettore M-PSI/02 - Psicobiologia E Psicologia FisiologicaTranscranial direct-current stimulationmedicine.diagnostic_testElectromyography05 social sciencesMotor CortexEvoked Potentials MotorAdaptation PhysiologicalTranscranial magnetic stimulationmedicine.anatomical_structureVisual PerceptionPsychologyNeurosciencePsychomotor Performance030217 neurology & neurosurgeryMotor cortex

description

Abstract Background Prismatic adaptation (PA) shifts visual field laterally and induces lateralized deviations of spatial attention. Recently, it has been suggested that prismatic goggles are also able to modulate brain excitability, with cognitive after-effects documented even in tasks not necessarily spatial in nature. Objective The aim of the present study was to test whether neuromodulatory effects obtained from tDCS and prismatic goggles could interact and induce homeostatic changes in corticospinal excitability. Methods Thirty-four subjects were submitted to single-pulse transcranial magnetic stimulation (TMS) over the right primary motor cortex to measure Input-Output (IO) curve as a measure of corticospinal excitability. Assessment was made in three experimental conditions: before and after rightward PA and anodal tDCS of the right motor cortex; before and after rightward PA; before and after anodal tDCS of the right motor cortex. Results A significant decrease of MEPs amplitude and of IO curve slope steepness was found after the combination of rightward PA and anodal tDCS; on the other hand, an increase of MEPs amplitude and of the steepness of IO curve slope on the right motor cortex was found following either rightward PA or anodal tDCS. Conclusion These findings suggest that priming of motor cortex excitability using PA could be an additional tool to modulate cortical metaplasticity.

yearjournalcountryeditionlanguage
2017-07-01Neuropsychologia
https://doi.org/10.1016/j.neuropsychologia.2017.05.006