Non-Invasive Brain Stimulation Techniques in Cognitive and Motor Enhancement
Summary
Non-invasive brain stimulation encompasses a suite of methods designed to modulate neural activity without surgical intervention, with the dual aims of probing brain function and enhancing cognitive or motor performance. Techniques such as transcranial direct current stimulation (tDCS), transcranial alternating current stimulation (tACS) and temporally interfering (TI) electrical fields have each demonstrated capacity to alter cortical excitability, oscillatory rhythms and network connectivity. These interventions offer promise for augmenting memory, attention, language and motor learning in both healthy populations and those affected by neuropsychiatric conditions. By targeting specific cortical or subcortical regions, non-invasive stimulation can facilitate synaptic plasticity, adjust the balance of inhibitory and excitatory neurotransmission and promote reorganisation of white-matter tracts. The global relevance of these approaches spans healthy ageing, rehabilitation after stroke, treatment of mood disorders and mitigation of cognitive decline.
Research from Nature Portfolio
Recent studies have validated the concept of focal deep stimulation using externally applied TI electric fields. In human cadaver and modelling experiments, steerable high-frequency fields were shown to converge in the hippocampus with negligible cortical exposure, and follow-up fMRI and behavioural tests in volunteers confirmed enhanced episodic memory accuracy. In parallel, a randomised trial in older adults combined prefrontal anodal tDCS with executive function training over three weeks. Multimodal MRI revealed that active stimulation induced microstructural changes in prefrontal white matter, grey matter alterations at the stimulation site and strengthened functional connectivity within targeted networks. These neural modulations predicted gains on untrained cognitive tasks, elucidating mechanisms by which tDCS augments transfer effects beyond the trained paradigm.
Non-Invasive Brain Stimulation Techniques in Cognitive and Motor Enhancement publication trend
The graph below shows the total number of articles in non-invasive brain stimulation techniques in cognitive and motor enhancement across all publications each year (not limited to Nature Index journals).
Technical terms
Transcranial direct current stimulation (tDCS): Application of low-amplitude direct current via scalp electrodes to modulate neuronal membrane potentials and plasticity.
Transcranial alternating current stimulation (tACS): Delivery of sinusoidal currents at defined frequencies to entrain and manipulate endogenous brain rhythms.
Temporal interference stimulation (TI): Use of two or more high-frequency electric fields that intersect to produce a low-frequency envelope capable of targeting deep structures.
Functional connectivity: Statistical dependencies between spatially remote neurophysiological events, reflecting network synchronisation and communication.
Microstructural plasticity: Changes in white-matter fibre organisation, myelination or grey-matter microarchitecture in response to external modulation or training.
References
- Non-invasive temporal interference electrical stimulation of the human hippocampus. Nature Neuroscience (2023).
- Microstructural and functional plasticity following repeated brain stimulation during cognitive training in older adults. Nature Communications (2023).
- Transcranial alternating current stimulation (tACS) at gamma frequency: an up-and-coming tool to modify the progression of Alzheimer’s Disease. Translational Neurodegeneration (2024).
- Noninvasive Deep Brain Stimulation via Temporally Interfering Electric Fields. Cell (2017).
- Transcranial alternating current stimulation: a review of the underlying mechanisms and modulation of cognitive processes. Frontiers in Human Neuroscience (2013).
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