After a traumatic brain injury, amplitude neurofeedback is the best-documented route: small older trials plus one recent randomised trial show gains in attention and memory. Source-based qEEG-guided training (LORETA z-score) also has one favourable randomised trial. HRV biofeedback, which AAPB does not rate, mainly helps stress and mood regulation. Protocols vary widely from study to study, which limits what can be promised.
Updated :
What the research shows
EEG neurofeedback — standard amplitude training
Theta/beta, beta for attention, alpha-theta
Ages
Adult (18+)
Techniques
Theta/beta ratio, Beta training, Alpha-theta
AAPB3Probably efficaciousNeuroLogic3Probably efficacioussame vs AAPB
Level 3. Two small older randomised trials: Ayers 1993 (12 outpatients in psychotherapy with right-hemisphere closed head trauma, n = 6 + 6, right-hemisphere 4-7 Hz inhibit / 15-18 Hz reward vs psychotherapy alone; only the neurofeedback group improved, with the analysis method not described) and Keller 2001 (21 inpatients with moderate TBI, 10 neurofeedback sessions vs 10 computerised attention-training sessions; both groups improved on attention measures, only the neurofeedback group on sustained attention and on time spent producing beta) (AAPB ch. 38). One larger quasi-experimental study: Bennet 2017, n = 60 after road-traffic injury, 16-20 alpha-theta sessions vs treatment as usual, large effect sizes on perceived stress and self-reported symptom severity and a smaller effect on serum cortisol (AAPB ch. 38). Chen 2023 adds the first registered RCT: its theta/beta arm improved immediate memory and selective attention against usual care (abstract). Protocols differ from trial to trial, which is what keeps this below Level 4, where a replicable protocol is required.
Other neurofeedback methods
LORETA and variants (live z-score, sLORETA)
Ages
Adult (18+)
Techniques
LORETA, qEEG-guided (incl. z-score)
AAPB0Not ratedNeuroLogic3Probably efficacious
Level 3. Chen 2023: registered three-arm RCT (NCT03515317), n = 87 patients with TBI and cognitive impairment, 10 weekly 60-minute sessions; the LORETA z-score neurofeedback arm significantly improved immediate recall, delayed recall, recognition memory and selective attention against usual care, and improved total CIQ-R (abstract). This rests on uncontrolled series: Hershaw 2020, 23 completers of 15 to 20 sessions within 6 weeks, with significant reductions in PCL-M and NSI scores and improvement correlated with the number of sessions completed; Foster & Veazey-Morris 2013 (8 veterans) and Foster & Thatcher 2014 (3 further veterans, 11 analysed in total), reporting symptom improvement with normalisation of the trained regions (AAPB ch. 38). One randomised setting rather than two, hence Level 3 and not 4. The Chen 2023 abstract reports no direct statistical comparison between the two neurofeedback arms, so nothing establishes that LORETA z-score training outperforms amplitude training.
qEEG-guided coherence and connectivity training
Ages
Adult (18+)
Techniques
Coherence / connectivity
AAPB0Not ratedNeuroLogic2Possibly efficacious
Level 2. Walker 2002: qEEG-guided coherence training in 26 outpatients with persistent post-traumatic symptoms 3 to 70 months after mild head injury, training one coherence measure at a time over an average of 19 sessions; 88 % of patients reported greater than 50 % symptom improvement and all those employed before the injury returned to work (AAPB ch. 38). Thornton & Carmody 2013: 15 TBI patients trained on power and connectivity at multiple sites using functional network models, with improvement in auditory and visual memory and in qEEG measures, and a 0.64 correlation between auditory-memory gain and number of sessions (AAPB ch. 38). Case series with no control group. This matches NeuroLogic's published verdict that connectivity training has a genuine clinical literature, strongest precisely in network-characterised conditions such as TBI, but weakened throughout by under-controlled designs and by foundational measurement problems.
Infra-low frequency (ILF) / infra-slow (ISF)
Ages
Adult (18+)
Techniques
Infra-low frequency (ILF)
AAPB0Not ratedNeuroLogic2Possibly efficacious
Level 2. Annaheim 2022: double-blind randomised controlled trial, n = 20 neurorehabilitation inpatients with recently acquired frontal and optionally other brain lesions of mixed aetiology; 20 sessions of ILF neurofeedback against sham, with the Frontal Assessment Battery and the Test of Attentional Performance as outcomes. No significant between-group difference across the whole sample; in the predominantly-frontal-lesion subgroup, FAB and intrinsic-alertness gains were significantly larger under neurofeedback, with whole-group trends of p = 0.068 and p = 0.079 (abstract). A sham-null result is not a reason to lower a level, since sham retains contingent reinforcement, engagement and expectancy (Parsons 2026); but no positive controlled ILF result exists in TBI, the sample is small and not specifically traumatic, and the positive finding is a subgroup analysis.
Biofeedback
Heart rate variability (HRV) biofeedback
Ages
Adult (18+)
Techniques
HRV — resonance-frequency breathing
AAPB0Not ratedNeuroLogic3Probably efficacious
Level 3 (The AAPB rating covers neurofeedback only: AAPB has not rated biofeedback for traumatic brain injury.) Talbert 2023: PRISMA systematic review of 7 studies, a mean of 11 sessions (range 1 to 40); HRV biofeedback was associated with increased HRV and with improvement in cognitive, emotional and physical functioning including headache, dizziness and sleep; the authors judge effectiveness unclear because of poor-to-fair study quality and probable publication bias, all studies having reported positive results, and give no pooled effect (abstract). Talbert 2026: randomised sham-controlled trial, n = 58 enrolled and 49 completers (HRV-B 25, mean age 27.1; sham 24, mean age 26.6), five weekly sessions; the LF/HF ratio was higher than sham at rest (p = 0.004) and during stress recovery (p = 0.040), while HF, RMSSD and SDNN advantages disappeared after adjustment for pre-assessment values; fluid cognition and total composite scores improved in both arms with no between-group difference, and depression improved more with HRV-B (abstract).
In short
Clinical reading
NeuroLogic Level 3 for standard amplitude training in adults (same as the AAPB): Ayers 1993, Keller 2001, Bennet 2017 and the theta/beta arm of Chen 2023. AAPB rates neurofeedback only; NeuroLogic opens separate rows for LORETA z-score (3, new), coherence (2, new), ILF (2, new) and HRV biofeedback (3, new). Injury heterogeneity calls for individualisation, but no trial has tested clinical amplitude neurofeedback against a credible sham.
Protocols
Single-site amplitude protocols guided by the symptom profile and by the qEEG (theta inhibit, beta or SMR reward, alpha-theta for stress); LORETA z-score in source space where the qEEG warrants it; 20 to 40 session series, though published trials often run only 10 to 20. Resonance-frequency HRV biofeedback with daily home practice.
Limits
No neurofeedback or biofeedback study in children or adolescents with TBI exists, in the AAPB base or in the 2022-2026 window: no paediatric row is shown. Populations and protocols are highly heterogeneous, randomised trials are few and small, doses are short, no outcome was assessor-blind, and durability is almost undocumented. Nothing establishes that LORETA z-score training outperforms amplitude training.
Study base
Small, mostly uncontrolled neurofeedback literature spanning three decades, with one registered RCT since 2022; a younger HRV biofeedback literature of poor-to-fair quality. 2022-2026 base: 5 publications indexed in the archive (3 neurofeedback, 2 HRV biofeedback).
Brendan's perspective
Level 3 for amplitude training in adults, same as the AAPB, and it stays there for a plain reason: the protocols differ from trial to trial (Ayers 1993, Keller 2001, Bennet 2017, Chen 2023), so there is no replicable protocol to raise. The row that will surprise people who read me is LORETA z-score at 3, above my own enthusiasm for the method. The level follows Chen 2023, a registered randomised trial, not my taste; and that abstract reports no direct comparison between its two neurofeedback arms, so nothing establishes that source-space training beats surface amplitude training. After a head injury I work from the qEEG and the symptom profile — theta inhibit, beta or SMR reward, alpha-theta where stress dominates — over 20 to 40 sessions rather than the 10 to 20 the trials used, and I train HRV first: an unregulated autonomic system is noise in the learning loop. One thing to get straight about scope: this chapter is about the more severe end of head injury. Post-concussive syndrome is not rated here — it sits with concussion, also at level 3 — and conflating the two is how people end up quoting the wrong literature at each other. The problems in this indication rhyme with the ones next door. The samples are heterogeneous, and so, frankly, is the diagnosis: what counts as a TBI, and of what severity, varies more between services than anyone comfortable would like. The literature inherits that heterogeneity, which is part of why the protocols never converge. I think neurofeedback shows a lot of promise after a head injury, and I have seen significant gains anecdotally. What we owe the indication is better identification of responders and non-responders — not only from the qEEG and the clinical and functional profile, but from the nature of the injury itself, its mechanism, its site and its severity. That variable is sitting in plain sight in every one of these studies and almost nobody analyses on it. Worth saying out loud: no assessor-blind outcome anywhere here, almost no durability data, and nothing at all in children.
Keller (2001) Neurofeedback therapy of attention deficits in patients with traumatic brain injury doi:10.1300/J184v05n01_03
Chen et al. (2023) Effects of Neurofeedback on Cognitive Function, Productive Activity, and Quality of Life in Patients With Traumatic Brain Injury: A Randomized Controlled Trial doi:10.1177/15459683231170539
Annaheim et al. (2022) Neurofeedback in patients with frontal brain lesions: A randomized, controlled double-blind trial doi:10.3389/fnhum.2022.979723
Hershaw et al. (2020) Semi-automated neurofeedback therapy for persistent postconcussive symptoms in a military clinical setting: a feasibility study doi:10.1093/milmed/usz335
Walker, Norman & Weber (2002) Impact of QEEG-guided coherence training for patients with a mild closed head injury doi:10.1300/J184v06n02_05
Talbert et al. (2023) A systematic review of heart rate variability (HRV) biofeedback treatment following traumatic brain injury (TBI) doi:10.1080/02699052.2023.2208880
Talbert et al. (2026) A Randomized Sham-Controlled Trial of Heart Rate Variability Biofeedback Following Traumatic Brain Injury (TBI) doi:10.1007/s10484-025-09734-w
