Transcranial Photobiomodulation (tPBM) for Mild Cognitive Impairment (MCI): Key Findings from a Pilot Randomized Clinical Trial (RCT)
Bibliographic record
Abstract
BACKGROUND: Mild Cognitive Impairment (MCI) is a frequent precursor to Alzheimer's dementia (AD). Mitochondrial dysfunction, marked by reduced cytochrome c oxidase (CCO) activity and lower ATP production, is linked to these neurodegenerative diseases. This study evaluates transcranial photobiomodulation (tPBM), a non-invasive technique using near-infrared light to stimulate mitochondrial CCO, potentially enhancing neuronal energy and cognitive function in individuals with MCI. METHOD: Twenty patients with mild cognitive impairment (MCI) were randomly assigned to an active treatment group (n = 10) or a sham control group (n = 10) using visually identical devices to maintain blinding. Participants completed daily home-based tPBM sessions for 6 weeks. Pre- and post-treatment assessments included cognitive tests (MMSE, TMT-A & B, CVLT-II) and biomarker evaluations (blood samples via ELISA). Neuroimaging included proton magnetic resonance spectroscopy (¹H-MRS) of the posterior cingulate cortex (PCC) and whole-brain structural and resting-state functional MRI. Change scores were calculated by subtracting baseline from post-treatment values. RESULT: Compliance exceeded 98% in both groups, and tPBM was well-tolerated. The active tPBM group showed significantly greater post-treatment improvements from baseline (p < 0.05) compared to the sham group, including: (1) better recognition memory (higher long-delay hits, fewer false positives on the CVLT-II); (2) improved cognition (higher MMSE); (3) faster processing speed (shorter TMT-B times); (4) decreased plasma IL-6 levels; (5) higher choline/creatine ratio and a trend toward increased myoinositol/creatine in the PCC; (6) increased left nucleus-accumbens volume; and (7) enhanced functional connectivity within the DMN and between the caudate and DMN, along with decreased FC within the limbic network. CONCLUSION: Daily, home-based tPBM is a well-tolerated and feasible intervention that led to significant improvements in both cognitive function and biological markers in individuals with MCI. The active tPBM group demonstrated enhanced cognition, recognition memory, and processing speed, alongside reductions in inflammation and structural and functional brain changes, including increased neuroplasticity and alterations in brain connectivity. These findings suggest that tPBM may promote neuronal function and brain network modifications, particularly within the default mode network and limbic regions, providing evidence for its potential as a therapeutic approach in the early stages of Alzheimer's disease.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.005 | 0.005 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.003 | 0.002 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.008 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".