Can Light Therapy Help ADHD? A Science-Based Look at Photobiomodulation

Understanding ADHD: Symptoms, Brain Function, and Challenges

Attention-Deficit/Hyperactivity Disorder (ADHD) affects both children and adults and extends far beyond difficulty paying attention. Core domains include inattention, impulsivity, hyperactivity, emotional dysregulation, and impaired executive function (APA, 2013). Adults often experience trouble with planning, working memory, task initiation, and regulating emotional responses.

Neurologically, ADHD is associated with altered activity in prefrontal and fronto-striatal circuits, irregularities in the default mode network (DMN), and reduced dopaminergic signaling (Castellanos & Proal, 2012). Many individuals also show atypical brainwave patterns, such as an elevated theta/beta ratio, reflecting underactivation in executive regions (Loo & Makeig, 2012).

Understanding these neural underpinnings helps explain why brain-based interventions, including neurofeedback and photobiomodulation, are gaining interest.

Traditional ADHD Treatments

Current evidence-based ADHD treatments include:

• Stimulant medication, which improves attention and executive function by enhancing dopamine signaling (Faraone & Buitelaar, 2010). Common name brands include Ritalin, Vyvanse, and Concerta.
• Non-stimulant medications, often used when stimulants are not tolerated. Medications include name brands such as Wellbutrin and Strattera.
• Cognitive-behavioral therapy (CBT) for emotional regulation and executive skills.

However, medication side effects, sleep disturbances, appetite suppression, emotional blunting, or personal preference lead some individuals to explore adjunctive or non-pharmacological approaches. This interest has contributed to growing attention toward photobiomodulation (tPBM).

What Is Photobiomodulation (tPBM)?

Photobiomodulation (tPBM) is a form of near-infrared (NIR) light therapy that uses wavelengths typically between 660-1100 nm to support cellular and neurological function. These wavelengths penetrate the scalp and skull, reaching cortical tissue without heat or tissue damage (Tedford et al., 2015).

tPBM is thought to influence brain function through several mechanisms:

• Mitochondrial support: NIR light interacts with cytochrome-c oxidase (CCO), enhancing ATP production (Hamblin, 2016).
• Improved cerebral blood flow: Studies show increased blood oxygenation in the prefrontal cortex following tPBM (Tian et al., 2016).
• Reduced inflammation and oxidative stress: NIR light modulates inflammatory cascades and reactive oxygen species (Hamblin, 2016).
• Network-level effects: Research suggests that 40 Hz pulsed NIR light may modulate gamma oscillations associated with attention, memory, and cognitive control (Iaccarino et al., 2016).

These mechanisms may be relevant for focus, executive function, and emotional regulation, making ADHD a promising area of exploration.

How tPBM Interacts With the ADHD Brain

tPBM targets many of the same neural networks implicated in ADHD symptoms:

1. Prefrontal Cortex Activation

NIR light applied to the forehead increases oxygenation and metabolic activity in the dorsolateral prefrontal cortex - an area essential for attention and executive function (Tian et al., 2016).

2. Modulation of Neural Oscillations

Gamma-frequency (≈40 Hz) stimulation has been shown to influence cognition, working memory, and attentional control (Iaccarino et al., 2016). Pulsed tPBM at these frequencies may interact with these oscillatory networks.

3. Improved Cognitive Performance

Human studies have found tPBM improves sustained attention, working memory, and reaction time (Barrett & Gonzalez-Lima, 2013; Vargas et al., 2017) - domains often impaired in ADHD.

4. Support for Emotional Regulation

PBM’s anti-inflammatory and neuromodulatory effects may influence mood and emotional control, which many people with ADHD struggle with.

While results are early, these pathways map closely onto common ADHD symptoms.

Potential Benefits of tPBM for ADHD Symptoms

Based on emerging research, case examples, and known mechanisms, tPBM may support:

• Sustained attention and focus
• Working memory and mental clarity
• Task initiation and cognitive endurance
• Reduced overwhelm and improved emotional regulation
• Better stress response and autonomic balance

These benefits are not framed as treatment claims but as potential neurological effects consistent with existing literature.

Emerging Research on Light Therapy and Cognitive Function

Even though ADHD-specific tPBM trials are limited, several cognitive neuroscience studies demonstrate meaningful effects relevant to ADHD:

• tPBM to the prefrontal cortex improves executive functioning and sustained attention (Barrett & Gonzalez-Lima, 2013).
• NIR stimulation enhances working memory accuracy (Vargas et al., 2017).
• 40 Hz NIR stimulation entrains gamma oscillations associated with cognitive control (Iaccarino et al., 2016).
• tPBM improves mood and reduces symptoms of anxiety and depression, which commonly co-occur with ADHD (Cassano et al., 2015).

Together, these findings create a strong theoretical foundation for exploring ADHD applications.

‍

Who Might Benefit Most From ADHD-Focused PBM?

Based on current understanding, individuals who may be particularly interested include:

• Adults seeking non-medication or adjunctive approaches
• People who experience emotional dysregulation or overwhelm
• Those struggling with cognitive fatigue or brain fog
• Students and professionals looking for improved focus and working memory
• Individuals who cannot tolerate stimulant medications

Real-world user interest often aligns with these profiles, though research is still emerging.

tPBM Compared to Conventional ADHD Interventions

.compare-table { width: 100%; border-collapse: collapse; table-layout: fixed; font-size: 18px; color: #000; } .compare-table th, .compare-table td { border: 2px solid #000; padding: 18px 16px; vertical-align: top; word-wrap: break-word; } .compare-table thead th { text-align: center; font-weight: 800; } .compare-table thead th:first-child { font-size: 0; padding: 18px 16px; } .compare-table tbody th { text-align: left; font-weight: 800; width: 28%; } .compare-table tbody td { width: 36%; line-height: 1.35; } ADHD Medication tPBM How it works Alters dopamine and/or norepinephrine levels to improve attention and executive functioning. Support brain function, blood flow, and cellular energy to improve focus, mood, and cognitive performance via NIR light. Administration Daily oral medication (pills, capsules, or liquid). Wearable session (typically 10-30 minutes) using a light-emitting headset. Onset of Effects Often gradual, building over repeated sessions as neurophysiological changes accumulate. Often rapid - sometimes within 30-60 minutes for stimulants. Side Effects Can include appetite changes, sleep disturbances, increased heart rate, anxiety, or mood changes in some individuals. Generally well-tolerated; may include mild warmth or temporary headache if dosage is too high.

‍

The Future of tPBM for ADHD

While research on tPBM specifically for ADHD is still emerging, current studies in cognitive neuroscience point to several mechanisms - improved prefrontal activation, enhanced neural oscillations, better working memory, and greater emotional balance - that overlap significantly with common ADHD challenges. For individuals looking beyond medication or seeking complementary strategies, tPBM offers a non-invasive, well-tolerated approach that aligns with what we know about the brain’s energy systems and executive networks.

References

American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.).

Barrett, D. W., & Gonzalez-Lima, F. (2013). Transcranial infrared laser stimulation produces beneficial cognitive and emotional effects in humans. Neuroscience, 230, 13–23. https://doi.org/10.1016/j.neuroscience.2012.11.016

Cassano, P., et al. (2015). Near-infrared transcranial radiation for major depressive disorder: A pilot feasibility study. Neuropsychiatric Disease and Treatment, 11, 3079–3090. https://doi.org/10.2147/NDT.S91174

Castellanos, F. X., & Proal, E. (2012). Large-scale brain systems in ADHD: Beyond the prefrontal-striatal model. Trends in Cognitive Sciences, 16(1), 17–26. https://doi.org/10.1016/j.tics.2011.11.007

Faraone, S. V., & Buitelaar, J. (2010). Comparing the efficacy of stimulants for ADHD. European Child & Adolescent Psychiatry, 19(4), 353–364. https://doi.org/10.1007/s00787-009-0054-3

Hamblin, M. R. (2016). Shining light on the head: Photobiomodulation for brain disorders. BBA Clinical, 6, 113–124. https://doi.org/10.1016/j.bbacli.2016.09.002

Iaccarino, H. F., et al. (2016). Gamma frequency entrainment attenuates amyloid load and modifies microglia. Nature, 540(7632), 230–235. https://doi.org/10.1038/nature20587

Loo, S. K., & Makeig, S. (2012). Clinical utility of EEG in attention-deficit/hyperactivity disorder: A research update. Neurotherapeutics, 9(3), 569–587. https://doi.org/10.1007/s13311-012-0131-z

Tedford, C. E., et al. (2015). Quantitative analysis of transcranial and intraparenchymal light penetration in human cadaver brain tissue. Lasers in Surgery and Medicine, 47(4), 312–322. https://doi.org/10.1002/lsm.22347

Tian, F., et al. (2016). Transcranial photobiomodulation improves cerebral blood flow and cognitive performance in humans. Scientific Reports, 6, 30540. https://doi.org/10.1038/srep30540

Vargas, E., et al. (2017). Transcranial laser stimulation improves working memory in humans. Photomedicine and Laser Surgery, 35(10), 487–494. https://doi.org/10.1089/pho.2017.4341

‍