Neurofeedback and ADHD

What Is Neurofeedback?

Neurofeedback (or neurotherapy) is a form of brain biofeedback that uses real-time electroencephalography (EEG) to train the brain to modify its own activity patterns. The principle is simple: sensors placed on the scalp measure brain electrical activity, and software translates these signals into visual or auditory feedback (a video game, animation, music). When the brain produces the desired wave pattern, feedback is positive (the game advances, music plays). When it deviates, feedback stops.

Through this operant conditioning mechanism, the brain progressively learns to produce more adaptive activity patterns. It is implicit learning: the patient doesn't need to consciously "do" anything — their brain automatically adjusts to obtain the reward.

Scientific Foundations

Brain Waves in ADHD

EEG studies have identified particularities in the brain activity of people with ADHD:

• Excess theta waves (4-8 Hz): associated with daydreaming, lack of focus, "automatic mode"
• Beta wave deficit (13-30 Hz): associated with focused attention, cognitive arousal and information processing
• Elevated theta/beta ratio: the most studied ADHD biomarker, reflecting cortical under-arousal

In 2013, the US FDA approved the NEBA system (Neuropsychiatric EEG-Based Assessment Aid) which uses the theta/beta ratio as an ADHD diagnostic aid, underscoring the validity of these neurophysiological markers.

Neuroplasticity

Neurofeedback relies on the brain's capacity to modify itself through experience (neuroplasticity). Repeated sessions strengthen new synaptic connections and more functional activation patterns, following Hebb's principle: "neurons that fire together wire together."

Validated Protocols

Theta/Beta Protocol (SMR/Beta)

The most studied protocol for ADHD. It aims to:

• Reduce theta activity (slow waves) on frontal and central regions
• Increase SMR (sensorimotor rhythm, 12-15 Hz) or beta (15-20 Hz) activity on central cortex

This protocol has been the subject of multiple randomized controlled trials (RCTs) and meta-analyses.

SCP Protocol (Slow Cortical Potentials)

Trains regulation of slow cortical potentials, involved in attentional resource allocation. The patient learns to produce "negativations" (activation) and "positivations" (inhibition) on command. This protocol showed comparable results to theta/beta in the multicenter study by Strehl et al. (2017).

Number of Sessions

Standard protocols provide for 30 to 40 sessions of 30 to 60 minutes, at a rate of 2 to 3 sessions per week. Effects typically begin to be noticeable after 15 to 20 sessions. Follow-up at 6 and 12 months is recommended to consolidate gains.

Clinical Study Results

Meta-Analyses

• Cortese et al. (2016) — Cochrane meta-analysis of 13 RCTs: significant effect on inattention (parent-rated), non-significant effect in blinded assessment. This distinction remains a major debate point.
• Van Doren et al. (2019) — follow-up meta-analysis: observed gains maintained at 6 and 12 months, which is not the case for medication upon discontinuation. This lasting effect is a strong argument for neurofeedback.
• Arns et al. (2020) — largest EEG database analysis: patients with elevated theta/beta ratio respond better, suggesting the value of pre-treatment EEG to predict response.

Comparison with Medication

Meisel et al. (2013) compared neurofeedback to methylphenidate over 12 months. Both approaches showed similar ADHD symptom improvements, but neurofeedback also improved academic performance, an effect not observed with medication alone.

Limitations and Precautions

• Potential placebo effect: studies with sham neurofeedback sometimes show improvements in the control group, raising questions about specific vs non-specific training contribution.
• Protocol heterogeneity: results vary considerably depending on protocol used, treatment duration and studied population.
• Cost: 30 to 40 sessions at 60-100 EUR per session represent a significant investment, generally not reimbursed by public health insurance.
• Practitioner training: result quality strongly depends on therapist competence. Require BCIA (Biofeedback Certification International Alliance) certification or equivalent.
• Not a miracle cure: neurofeedback works better in combination with other approaches (CBT, coaching, exercise) than in isolation.

Choosing a Practitioner

Criteria for choosing a serious neurofeedback practitioner:

• Recognized certification (BCIA, BCN, or university training in neurotherapy)
• Quantified EEG (qEEG) before treatment to personalize protocol
• Use of research-validated protocols (theta/beta or SCP)
• Objective progress evaluation (standardized pre/post questionnaires)
• Transparency about expected results and method limitations
• Collaboration with other professionals (psychiatrist, psychologist, neuropsychologist)