4.6 Review

Neurophysiological mechanisms of transcranial alternating current stimulation

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Article Neurosciences

Transcranial alternating current stimulation ameliorates emotional attention through neural oscillations modulation

Shuang Liu et al.

Summary: Recent studies have found that transcranial alternating current stimulation (tACS) has significant effects on emotional attention. In this study, active-tACS at individual alpha frequency (IAF) was delivered to the bilateral dorsolateral prefrontal cortex (dlPFC), resulting in increased alpha entrainment at rest and improved attention in facial emotion processing.

COGNITIVE NEURODYNAMICS (2023)

Article Clinical Neurology

Transcranial Electrical Stimulation generates electric fields in deep human brain structures

Samuel Louviot et al.

Summary: This study measured the electric field in deep brain structures in 8 drug-resistant epileptic patients using simultaneous bipolar transcranial alternating current stimulation and intracerebral recordings. The findings suggest that TES at low intensities and with small HD electrodes can generate electric fields in deep brain structures, which are correlated with stimulation intensity and dependent on stimulation montage.

BRAIN STIMULATION (2022)

Review Neurosciences

State-dependent effects of neural stimulation on brain function and cognition

Claire Bradley et al.

Summary: This Review explores the effects of state-dependent variations in brain activity and behavior with brain stimulation. The authors focus on the use of transcranial magnetic stimulation and transcranial electrical stimulation in studying conscious state, attention, and working memory. They discuss how these stimulation methods can reveal patterns of neuronal activity responsible for regulating behaviors and emphasize the importance of considering physiological and cognitive states for the reliability of brain stimulation interventions.

NATURE REVIEWS NEUROSCIENCE (2022)

Article Neurosciences

Effects of transcranial alternating current stimulation on spiking activity in computational models of single neocortical neurons

Harry Tran et al.

Summary: Neural oscillations play a key role in information transfer in the brain, with transcranial alternating current stimulation (tACS) directly interacting with brain oscillatory activity. While tACS does not affect the firing rate of neurons in human studies, it can entrain the spiking activity of specific neuron types at lower field strengths. Understanding the impact of oscillating electric fields on single neuron activity highlights the importance of neuron morphology and biophysics in responsiveness to electrical stimulation.

NEUROIMAGE (2022)

Article Neurosciences

Detection of tACS Entrainment Critically Depends on Epoch Length

Myles Mc Laughlin et al.

Summary: Neural entrainment is the synchronization of neurons to external rhythmic stimuli, and detecting it depends on the length of information accumulation epoch. Longer epoch lengths make it easier to detect behavior effects.

FRONTIERS IN CELLULAR NEUROSCIENCE (2022)

Article Biochemistry & Molecular Biology

Brain stimulation competes with ongoing oscillations for control of spike timing in the primate brain

Matthew R. Krause et al.

Summary: Transcranial Alternating Current Stimulation (tACS) is a noninvasive method for modulating brain activity. However, it often yields highly variable results due to competition with the brain's ongoing oscillations.

PLOS BIOLOGY (2022)

Article Neurosciences

Frequency-Specific Modulation of Slow-Wave Neural Oscillations via Weak Exogeneous Extracellular Fields Reveals a Resonance Pattern

Boateng Asamoah et al.

Summary: Through applying exogenous extracellular fields to modulate slow-wave neural oscillations in anesthetized rats, it has been demonstrated that these fields can modulate the amplitude of endogenous neural oscillations in a frequency-specific resonance pattern without affecting spike rate.

JOURNAL OF NEUROSCIENCE (2022)

Review Neurosciences

Breaking the boundaries of interacting with the human brain using adaptive closed-loop stimulation

Khaled Nasr et al.

Summary: The article provides a comprehensive review of the current state of interacting with human brain activity, highlighting limitations and recent efforts to overcome them. Despite advancements in noninvasive methods, there are still limitations in spatial specificity and understanding of neural mechanisms. The article also introduces new methods for interacting with brain activity, such as task-irrelevant sensory stimulation and focal ultrasound stimulation. Finally, it argues for a paradigm shift towards adaptive closed-loop stimulation to advance human neuroscience.

PROGRESS IN NEUROBIOLOGY (2022)

Review Medicine, Research & Experimental

Synchronizing Brain Rhythms to Improve Cognition

Shrey Grover et al.

Summary: Impaired cognition is common in neuropsychiatric disorders, and synchronous electrophysiological rhythms play a key role in communication dynamics among brain networks. Transcranial alternating current stimulation has shown promising results in improving human cognition by modulating network synchronization, offering potential for noninvasive therapies for cognitive brain disorders.

ANNUAL REVIEW OF MEDICINE, VOL 72, 2021 (2021)

Article Clinical Neurology

Rapid, Dose-Dependent Enhancement of Cerebral Blood Flow by transcranial AC Stimulation in Mouse

Dennis A. Turner et al.

Summary: Transcranial alternating current stimulation can rapidly increase cerebral blood flow in mice at certain electric field amplitudes, but the necessary strength for reliable blood flow changes may not be tolerable in unanesthetized humans. Further modifications may be needed for translation to a human dose-response function.

BRAIN STIMULATION (2021)

Article Biochemistry & Molecular Biology

State-dependent responses to intracranial brain stimulation in a patient with depression

Katherine W. Scangos et al.

Summary: Deep brain stimulation shows promise in treating severe depression, but questions about anatomical targeting remain. A study implanting intracranial electrodes in a depressed patient found rapid, reproducible emotional responses that were context and state dependent, providing proof of concept for personalized, circuit-specific medicine in psychiatry.

NATURE MEDICINE (2021)

Article Neurosciences

Stimulation artifact source separation (SASS) for assessing electric brain oscillations during transcranial alternating current stimulation (tACS)

David Haslacher et al.

Summary: A real-time compatible artifact rejection algorithm (SASS) was introduced to overcome limitations in adapting stimulation parameters to ongoing brain oscillations. By using SASS, stimulation-specific signal components could be reliably removed while leaving physiological signal components unaffected. Results indicate that SASS can be used to establish adaptive AM-tACS, providing a potentially powerful tool to target various brain functions and investigate how AM-tACS interacts with electric brain oscillations.

NEUROIMAGE (2021)

Article Multidisciplinary Sciences

Selective modulation of interhemispheric connectivity by transcranial alternating current stimulation influences binaural integration

Basil C. Preisig et al.

Summary: Brain connectivity is crucial for encoding, transferring, and integrating sensory information, with neural oscillations synchronization playing a key role in perceptual integration. Interhemispheric oscillatory synchrony modulation affects binaural integration of dichotic acoustic features, and changes in intra- and interhemispheric connectivity induced by stimulation are correlated with changes in perceptual integration.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2021)

Review Clinical Neurology

Neurobiological After-Effects of Low Intensity Transcranial Electric Stimulation of the Human Nervous System: From Basic Mechanisms to Metaplasticity

Sohaib Ali Korai et al.

Summary: This review focuses on the molecular and cellular mechanisms of transcranial direct and alternating current stimulation, highlighting changes in membrane potential, neural synchronization, protein synthesis, and the role of glial cells in synaptic plasticity. Research from in vitro and in vivo studies in animals and humans provide insights into possible pathways for the development of targeted therapeutic applications.

FRONTIERS IN NEUROLOGY (2021)

Article Neurosciences

Transcranial Alternating Current Stimulation (tACS) Does Not Affect Sports People's Explosive Power: A Pilot Study

Andreina Giustiniani et al.

Summary: The study found no significant differences in sport performance of subjects after tACS stimulation, and genetic background did not influence the tACS-related effect on physical performance. Further research with larger sample sizes is needed to understand the potential role of non-invasive brain stimulation techniques in motor performance.

FRONTIERS IN HUMAN NEUROSCIENCE (2021)

Article Neurosciences

Modulation of Long-Term Potentiation by Gamma Frequency Transcranial Alternating Current Stimulation in Transgenic Mouse Models of Alzheimer's Disease

Won-Hyeong Jeong et al.

Summary: This study investigated the mechanism of transcranial alternating current stimulation (tACS) in 5xFAD mouse models and found that tACS can enhance synaptic transmission in these models, though without significantly affecting the related proteins according to Western blot analysis.

BRAIN SCIENCES (2021)

Review Psychiatry

Conducting double-blind placebo-controlled clinical trials of transcranial alternating current stimulation (tACS)

Flavio Frohlich et al.

Summary: The article discusses the concept of pathological changes in brain network oscillations and the potential therapeutic application of transcranial alternating current stimulation (tACS) for CNS illnesses. It focuses on the conceptual foundations of double-blind clinical trials, practical aspects of successful trial execution, and proposes a roadmap for moving towards convincing efficacy studies of tACS.

TRANSLATIONAL PSYCHIATRY (2021)

Article Clinical Neurology

Individual differences in neuroanatomy and neurophysiology predict effects of transcranial alternating current stimulation

Theodore P. Zanto et al.

Summary: This study aimed to evaluate the effects of tACS on older adults, and the results demonstrate the importance of individual differences in neuroanatomy and neurophysiology in tACS research.

BRAIN STIMULATION (2021)

Article Clinical Neurology

Electrified microglia: Impact of direct current stimulation on diverse properties of the most versatile brain cell

Anne-Kathrin Gellner et al.

Summary: The study shows that DCS can rapidly influence microglia dynamics, with different types of microglia having distinct responses to DCS. Additionally, DCS may indirectly affect microglial motility and phagocytosis through the fractalkine pathway driven potentially by neuronal activity.

BRAIN STIMULATION (2021)

Editorial Material Neurosciences

The continued need for animals to advance brain research

Judith R. Homberg et al.

Summary: Policymakers are working towards promoting animal-free alternatives in scientific research and have implemented strict regulations for animal research. However, in the field of neuroscience research, it is argued that the use of animals should not be compromised until viable and translational alternatives are available and proven to be valuable.

NEURON (2021)

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Transcranial alternating current stimulation entrains alpha oscillations by preferential phase synchronization of fast-spiking cortical neurons to stimulation waveform

Wei A. Huang et al.

Summary: The study demonstrates that tACS can entrain endogenous alpha oscillations, with a stronger entrainment response observed in fast-spiking inhibitory interneurons in both experimental and computational models. The findings provide insights into how weak electric fields in tACS can modulate neuronal activity and alpha oscillations.

NATURE COMMUNICATIONS (2021)

Article Multidisciplinary Sciences

Amplitude modulated transcranial alternating current stimulation (AM-TACS) efficacy evaluation via phosphene induction

Carsten Thiele et al.

Summary: The study evaluated the effects of amplitude modulated transcranial alternating current stimulation (AM-tACS) on inducing phosphenes, finding that AM-tACS with a 50 Hz carrier frequency was able to induce phosphenes, while carrier frequencies of 200 Hz and 1000 Hz did not. The stimulation effects of AM-tACS were found to be independent of amplitude modulation and instead relied solely on the carrier frequency.

SCIENTIFIC REPORTS (2021)

Article Neurosciences

Closed-Loop Transcranial Alternating Current Stimulation: Towards Personalized Non-invasive Brain Stimulation for the Treatment of Psychiatric Illnesses

Flavio Frohlich et al.

Summary: Closed-loop transcranial alternating current stimulation (tACS) has shown promising results in modulating neuronal network dynamics through targeted low-amplitude stimulation based on measured brain activity. Initial studies have successfully engaged targets, particularly in applications targeting specific activity patterns during sleep, indicating the potential of tACS as a novel therapeutic intervention for psychiatric disorders.

CURRENT BEHAVIORAL NEUROSCIENCE REPORTS (2021)

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Modulation of auditory gamma-band responses using transcranial electrical stimulation

Kevin T. Jones et al.

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tACS entrains neural activity while somatosensory input is blocked

Pedro G. Vieira et al.

PLOS BIOLOGY (2020)

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Transcranial alternating current stimulation entrains single-neuron activity in the primate brain

Matthew R. Krause et al.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2019)

Article Engineering, Biomedical

Electric field simulations for transcranial brain stimulation using FEM: an efficient implementation and error analysis

Guilherme B. Saturnino et al.

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Integrating electric field modeling and neuroimaging to explain inter-individual variability of tACS effects

Florian H. Kasten et al.

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tACS motor system effects can be caused by transcutaneous stimulation of peripheral nerves

Boateng Asamoah et al.

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Analyzing EEG and MEG signals recorded during tES, a reply

Nima Noury et al.

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Direct effects of transcranial electric stimulation on brain circuits in rats and humans

Mihaly Voroslakos et al.

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Differential polarization of cortical pyramidal neuron dendrites through weak extracellular fields

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Imaging of current flow in the human head during transcranial electrical therapy

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Spatial Working Memory in Humans Depends on Theta and High Gamma Synchronization in the Prefrontal Cortex

Ivan Alekseichuk et al.

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Sustained Aftereffect of α-tACS Lasts Up to 70 min after Stimulation

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Different coupling modes mediate cortical cross-frequency interactions

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4-Hz Transcranial Alternating Current Stimulation Phase Modulates Hearing

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Neurosensory Effects of Transcranial Alternating Current Stimulation

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Transcranial Alternating Current Stimulation Attenuates Visual Motion Adaptation

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Computational analysis shows why transcranial alternating current stimulation induces retinal phosphenes

Ilkka Laakso et al.

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