Friends, not foes: Magnetoencephalography as a tool to uncover brain dynamics during transcranial alternating current stimulation
| Autor: | Marco Fuscà, Toralf Neuling, Philipp Ruhnau, Christoph Herrmann, Gianpaolo Demarchi, Nathan Weisz |
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| Rok vydání: | 2015 |
| Předmět: |
Adult
Male tACS Visual perception Brain activity and meditation Cognitive Neuroscience medicine.medical_treatment Stimulation Artifact rejection Electroencephalography Transcranial Direct Current Stimulation Article Entrainment Young Adult Magnetoencephalography MEG Transcranial alternating current stimulation Neurology medicine Humans Cerebral Cortex Transcranial direct-current stimulation medicine.diagnostic_test Signal Processing Computer-Assisted Cognition Alpha Rhythm stomatognathic diseases Auditory Perception Evoked Potentials Auditory Visual Perception Evoked Potentials Visual Female Psychology Neuroscience |
| Zdroj: | Neuroimage |
| ISSN: | 1053-8119 |
| DOI: | 10.1016/j.neuroimage.2015.06.026 |
| Popis: | Brain oscillations are supposedly crucial for normal cognitive functioning and alterations are associated with cognitive dysfunctions. To demonstrate their causal role on behavior, entrainment approaches in particular aim at driving endogenous oscillations via rhythmic stimulation. Within this context, transcranial electrical stimulation, especially transcranial alternating current stimulation (tACS), has received renewed attention. This is likely due to the possibility of defining oscillatory stimulation properties precisely. Also, measurements comparing pre-tACS with post-tACS electroencephalography (EEG) have shown impressive modulations. However, the period during tACS has remained a blackbox until now, due to the enormous stimulation artifact. By means of application of beamforming to magnetoencephalography (MEG) data, we successfully recovered modulations of the amplitude of brain oscillations during weak and strong tACS. Additionally, we demonstrate that also evoked responses to visual and auditory stimuli can be recovered during tACS. The main contribution of the present study is to provide critical evidence that during ongoing tACS, subtle modulations of oscillatory brain activity can be reconstructed even at the stimulation frequency. Future tACS experiments will be able to deliver direct physiological insights in order to further the understanding of the contribution of brain oscillations to cognition and behavior. |
| Databáze: | OpenAIRE |
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