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Long-Term Transcranial Direct Current Stimulation Does Not Improve Executive Function in Healthy Older Adults
Lijuan Huo1,2, Zhiwei Zheng1,2, Jin Li1,2
1Center on Aging Psychology, CAS Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China.
Frontiers in Aging Neuroscience
|November 3, 2018
Summary
Long-term transcranial direct current stimulation (tDCS) alone did not improve executive function in healthy older adults. Combining brain stimulation with cognitive training may be more effective for enhancing cognitive abilities in seniors.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Gerontology
Background:
- Executive function naturally declines with age.
- Transcranial direct current stimulation (tDCS) shows potential for cognitive enhancement.
- Previous studies suggest tDCS aids executive function by augmenting cognitive training gains in older adults.
Purpose of the Study:
- To investigate if long-term transcranial direct current stimulation (tDCS) applied solely to the prefrontal cortex can enhance executive function in healthy older adults.
- To assess the standalone efficacy of tDCS for improving cognitive abilities in the aging population.
Main Methods:
- Sixty-five healthy older adults were randomized into anodal tDCS or sham tDCS groups.
- Participants received daily 30-minute stimulation over the left dorsolateral prefrontal lobe for 10 consecutive days.
- Executive function was assessed using updating, inhibition, and shifting tasks before, immediately after, and 3 months post-stimulation.
Main Results:
- No significant differences in executive function were observed between the anodal tDCS and sham groups.
- No statistically significant stimulation effects were found during the follow-up assessment.
- The study found no evidence that tDCS alone improves executive function in healthy older adults.
Conclusions:
- Multiple sessions of tDCS, independent of cognitive training, do not appear to benefit executive function in healthy older adults.
- The efficacy of tDCS in enhancing executive function may depend on its synergistic effect with cognitive training.
- Combining brain stimulation techniques with traditional cognitive training may offer a more promising strategy for improving executive function in older adults.
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