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Transcranial Electrical Stimulation: Methodology and Applications
Authors
E. Angelakis Liouta, E.
Publication date
1 January 2011
Publisher
Abstract
Low-intensity transcranial current stimulation is a rapidly growing field of research. Transcranial direct current stimulation (tDCS) is the dominant paradigm of this new field, with transcranial alternating current stimulation (tACS) just emerging. Anodal stimulation with tDCS has excitatory effects on the underlying cortex, whereas cathodal stimulation has inhibitory effects. Because both electrodes have significant brain effects when placed at cephalic areas, the term "reference" electrode should be avoided. Most studies have applied tDCS to the motor cortex, the prefrontal cortex, and the occipital cortex. Applications of tDCS include modulation of electrophysiological and hemodynamic brain activity, symptom reduction in neurological and psychiatric pathology, and cognitive improvement in healthy volunteers or clinical populations. There is evidence of motor improvement in patients with stroke, pain reduction in fibromyalgia, improved mood in patients with unipolar or bipolar depression, and reduced craving. Healthy volunteers are shown to improve their verbal fluency, working memory, and implicit learning. Moreover, there are interactions of tDCS with various pharmacological substances. There are no significant side effects, apart from minor skin lesions when tap water is used instead of saline solution in the sponge electrodes. Further research is required to reveal the potential of tACS. © 2011 Copyright Taylor and Francis Group, LLC
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Last time updated on 10/02/2023