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Modulating Cognition Using Transcranial Direct Current Stimulation of the Cerebellum
Published on: February 15, 2015
Transcranial direct current stimulation to improve cognitive function in patients with vascular cognitive impairment:
Jiamian Shi1, Xiaodong Li1, Ling Guan2,3
1Department of Biomedical Engineering, Medical Science and Engineering, Beijing Institute of Technology, Beijing, China.
Insights
Transcranial direct current stimulation (tDCS) shows promise for improving cognition in vascular cognitive impairment (VCI), particularly after stroke. More research is needed for non-stroke VCI and understanding tDCS mechanisms.
Area of Science:
- Neuroscience
- Neurology
- Rehabilitation Medicine
Background:
- Vascular pathology is a leading cause of cognitive impairment, often co-occurring with neurodegenerative diseases.
- Vascular cognitive impairment (VCI) includes conditions like post-stroke cognitive impairment (PSCI) and cerebral small vessel disease (CSVD).
- Evidence for transcranial direct current stimulation (tDCS) in VCI is limited, especially for non-stroke related causes.
Purpose of the Study:
- To review the effects of tDCS on cognitive rehabilitation in individuals with VCI.
- To summarize current evidence on tDCS efficacy in different VCI populations.
- To identify gaps in research regarding tDCS mechanisms and applications in VCI.
Main Methods:
- Structured narrative review of 18 studies meeting inclusion criteria.
- Included studies focused on VCI, ranging from mild impairment to dementia.
- Analysis of cognitive outcomes, rehabilitation strategies, and neuroimaging findings.
Main Results:
- tDCS demonstrated positive effects on global cognition and executive functions in PSCI.
- Combination therapy (tDCS + rehabilitation) enhanced cognitive recovery in PSCI.
- Neuroimaging suggests tDCS modulates cortical excitability, connectivity, and potentially cerebral blood flow.
Conclusions:
- tDCS is a promising intervention for cognitive rehabilitation in PSCI.
- More research is required for non-stroke VCI and to elucidate the underlying neurophysiological mechanisms of tDCS.
- Future studies should investigate tDCS effects on neurovascular coupling in VCI.
Abstract:
Vascular pathology represents the second most common cause of cognitive impairment after Alzheimer's disease and contributes substantially to mixed dementia involving both vascular and neurodegenerative mechanisms. Vascular cognitive impairment (VCI) emerges as a term encompassing cognitive impairments resulting from stroke, cerebral small vessel disease (CSVD), or other forms of vascular pathology. While numerous studies have demonstrated the beneficial effects of transcranial direct current stimulation (tDCS) on mild cognitive impairment and dementia, evidence specifically addressing its efficacy in VCI remains limited. We conducted a structured narrative review to summarize the effects of tDCS on cognitive rehabilitation in individuals with VCI. Studies were included if participants had cognitive impairment related to vascular pathology and if cognitive severity ranged from mild cognitive impairment to dementia. Eighteen studies met the inclusion criteria. Among the included studies, 15 were conducted in post-stroke cognitive impairment (PSCI) populations, whereas only three studies focused on non-stroke VCI. Across the included studies, tDCS has demonstrated promising effects on global cognition and executive function in PSCI populations. Combining tDCS with cognitive or motor rehabilitation appeared to further facilitate cognitive recovery in PSCI populations. Neuroimaging and EEG findings suggest that tDCS may be associated with cognitive improvement through potential modulation of cortical excitability, neural oscillatory activity, and functional connectivity. In addition, preliminary evidence suggests tDCS may have the potential to modulate cerebral blood flow, indicating a potential modulatory effect on neurovascular coupling. However, most available studies were conducted in patients with PSCI, with insufficient evidence in non-stroke VCI populations related to CSVD. Furthermore, the neurophysiological mechanisms by which tDCS modulates vascular and cognitive function remain poorly understood, warranting further investigation in future studies.
