This article comes from a recent Neurofeedback & Chill livestream, my weekly session where I run a few minutes of live neurofeedback to demystify the technique, then walk through current research. This week I covered five recent studies on slowing or reversing biological brain age, plus a hands-on demo of a form of training called HEG. Audience questions are folded in without names.
What Is HEG, and How Does It Train the Brain?
I opened the stream with passive infrared hemoencephalography, or HEG. The hardware is an infrared camera worn on the forehead, pointed inward, measuring heat coming off the frontal lobe. There is no emitter and no near-infrared light source. Dr. Jeff Carman developed this version primarily for migraine work, and it works well for that. I run the signal through a small amplifier into signal-processing software that scales and averages it.
The mechanism: when you concentrate or generate positive affect, frontal tissue calls for more fuel, and blood flow to that region rises about a second and a half to two seconds later. The camera reads that as a heat surge. The signal lags your thoughts because perfusion is slower than neural firing. I sample every 500 milliseconds, more than twice as often as the blood-flow signal changes, which captures the fluctuation cleanly.
Most central nervous system biofeedback is involuntary. You cannot feel your neurons. With frontal HEG you get partial voluntary control through concentration and happy thoughts, which makes it a useful tool to explore for migraine, brain fog, and some post-concussion and post-COVID symptoms. Many of these conditions involve neurovascular coupling, where the neurons' demand for fuel and the blood supply's ability to deliver it fall out of sync. A drop in metabolic activity in visual tissue is what produces the migraine aura with its visual distortions. I have written more on this approach in Brain Biohacking with Photobiomodulation, which sits in the same family of frontal optimization tools.
One audience question asked about stacking HEG with hyperbaric oxygen. My general rule is to dive last in a single day, because HBOT hypernormalizes tissue for a few hours and can mask the resource you are trying to train. HEG may be an exception. At two atmospheres breathing high-flow oxygen for 90 minutes, you saturate tissues that normally get limited blood flow. Calling for higher perfusion with HEG right after a dive could create an uptake effect, similar to a carbohydrate refeed after a hard workout. That is a reasoned guess, not a tested protocol.
How Does Biological Aging Actually Change?
Before the studies, a frame. Classic healthy aging aims at compression of morbidity: you flatten the decline curve so you stay high-functioning, then drop off quickly at the very end rather than spending years in slow decline. Most interventions shift the trajectory a little. They modify symptoms more than they modify disease. We are starting to get real handles on the big diseases of aging, including cancer, diabetes, Alzheimer's, and Parkinson's, though none of them completely. The goal these five studies point toward is life in years, not just years in life. If you want the deeper version of this, see The Critical Aging Window.
Why Do Seniors Who Use Smartphones Have Lower Dementia Risk?
A meta-analysis across 57 studies and over 400,000 tracked participants found a 58 percent lower risk of cognitive decline in older adults who use digital technology, whether smartphones, computers, tablets, or laptops (Benge & Scullin, 2025). That is a large effect, and it cuts against the "digital dementia" myth.
Two mechanisms likely drive it. The first is environmental press: the brain and body are biased to stay engaged with living, adapting to stressors, and handling novelty. Disengage from challenge and the basic processes of life function less well. Using technology keeps you engaged with complex, changing tasks. The second is social connection. A smart picture frame, a tablet, or a video device gives older adults far more access to family and community than a landline ever did. That social access is, I think, a major part of the protective effect.
Does Playing Music Keep Your Mind Sharp as You Age?
A study of about 1,100 participants with an average age of 68 found that musical engagement, both listening and active playing or singing, was associated with better memory, problem solving, and processing speed (Gaser et al., 2024). Those are core components of IQ.
People who played keyboard instruments showed the strongest memory benefits. Two reasons stand out. We have a tonotopic map of pitch in the temporal lobes, cells arranged almost like a keyboard, so keyboard playing engages that structure directly. Playing also demands complex motor learning, and complex motor learning enhances memory broadly. Singing helped most with complex tasks, which makes sense given that singing means controlling a wide range of muscles and acoustic physics at once with fine-grained precision. This is association more than proven cause, since people with a musical bent may self-select into music. The causal story is plausible enough that I would say go play an instrument. If you want the mechanism behind why complex learning sticks, see Biohacking Memory and Biohacking Learning.
Can Simple Living Lower Your Biological Age?
A Stanford researcher spent three years on a research sabbatical in a cabin in the woods. He minimized contact with technology, focused on whole foods, and cut refined sugars and seed oils, with good daily activity. After three years his health markers improved across the board: better energy, fewer headaches, improved gut function. His biological age on metabolic markers dropped by about ten years.
Three years of investment for ten years of biological age reduction, and those three years were likely high-quality years rather than a sacrifice. This is the kind of intervention worth chasing, where the time you put in returns benefit over a much longer span. The caveat is sample size of one. We cannot separate the lifestyle change from whatever natural capacity this individual had to age slowly. The components, whole foods, activity, lower toxic load, are well supported on their own. If diet timing interests you, Strategic Fasting covers the metabolic side.
Does Long-Term Meditation Make the Brain Younger?
A Harvard study examined advanced meditators trained in Samyama Sadhana, recruiting people who had completed an 8-day silent retreat, a marker of serious practice. The researchers measured EEG changes during sleep, including REM and EEG speed, features that track with brain age. Compared to age-matched controls with healthy brains, this group showed an average of 5.9 years of reduced brain aging based on EEG and sleep signatures. A 10-day Vipassana retreat would likely produce similar effects, and prior studies on those populations support that.
A separate longitudinal study underscored Sara Lazar's long line of work on meditation. Lazar has shown preservation of cortical thickness across life proportional to how much a person meditates (Lazar et al., 2005). There is also a shift in where meditation activates the brain over time. Early practice shows front-midline dorsal anterior cingulate activation, a sense of self holding the internal environment. After months and years, activation moves to the ventral surface beneath the anterior cingulate, a state with more feeling tone and value but with the self less heavily anchored to it. The newer study found that long-term meditators used fewer pharmacological interventions, showed more brain volume consistent with Lazar's findings, and reported higher quality of life.
There may be an interaction with gerotranscendence, the shift some people make later in life from fearing death toward curiosity, lightness, and peace. Long-term meditators may be more likely to reach that state. That last point is a hunch. The dose here is modest: roughly 20 minutes a day. For the full mechanism of how meditation reshapes the brain, see Biohacking Meditation and Mindfulness: Don't Just Do Something, Sit There.
What Does Inflammation Have to Do with All of This?
An audience question asked how much of health reduces to keeping inflammation low. It is a large piece. Inflammatory processes drive changes at the cell, subcellular, tissue, and system levels: oxidative stress, circulation problems, inflammatory cytokines, and the immune response to that inflammation. A little inflammation is pro-health; a lot is strongly anti-health. The two levers you actually control are sleep and diet, both of which move inflammatory load, assuming there is no specific acute cause that needs separate treatment.
On a related question about histamine, histamine sits upstream of neurotransmitters like dopamine and serotonin, functioning a bit like a thermostat that bumps the whole system up. Acutely you see faster alpha, more beta power and beta spindles, and suppression of delta and theta. That is the physiology behind the fast-thinking, allergy-prone, slightly anxious phenotype. Chronically the picture inverts: elevated delta and theta from inflammatory load, depleted alpha, depleted beta with beta spindles, and cortisol-driven hippocampal atrophy that reduces connectivity and plasticity. To understand alpha and beta dynamics, see Decoding Alpha Waves.
How Do You Support Brain Glymphatic Drainage?
The glymphatic system is the brain's equivalent of the lymphatic system, draining cerebrospinal fluid and metabolic waste (Xie et al., 2013). Deep slow-wave sleep generates a roughly 2 Hz mechanical and fluid pressure wave that moves through the brain like an agitation cycle in a washing machine, flushing byproducts into CSF (Fultz et al., 2019). That makes deep sleep the first lever. Sauna likely helps too; regular sauna use correlates with a large drop in all-cause mortality (Laukkanen et al., 2015), and glymphatic support is probably part of that. Exercise is a third candidate, since large muscle movement pumps the body's lymphatic system and motion likely assists brain drainage as well. Sleep is the best-established of the three. Biohacking Sleep covers how to protect slow-wave sleep specifically.
Can AI Read a QEEG or Raw EEG File?
Several questions touched on feeding brain data into AI tools. My experience: AI does reasonably well on a continuous performance test like the IVA-2, because the labels are meaningful, the constructs are stable, and there is little test-retest variability or practice effect. It does poorly on QEEG right now. I regularly see people bring me an AI reading of their QEEG report flagging an "issue" that is actually muscle tension or cardioballistic artifact in the data. AI is often about 70 percent right with a large misunderstanding embedded in it, and it is confidently wrong in a way that is hard to catch unless you already have the skill to catch it.
People doing serious work with custom-trained models on raw EEG are getting interesting results, but it still needs a skilled person in a semi-supervised loop. We are probably a couple of years from dumping a raw EEG file and getting reliable QEEG-level predictions back. For what a proper QEEG actually measures, see QEEG Brain Mapping.
What Are Event-Related Potentials, and Do They Matter for Neurofeedback?
An ERP, or event-related potential, is the instantaneous EEG response tied to a specific event, either evoked by a stimulus or induced by a task. Examples include the P300 positive wave about 300 milliseconds after you notice something novel, the N400 negative deflection after a grammatical error, and the P50 sensory gating response about 50 milliseconds after a stimulus. In schizophrenia, the P50 fails to suppress, which is part of the exaggerated startle response.
You build an ERP by repeating an event many times and averaging the EEG around it. The ongoing endogenous EEG is out of phase with the event, so it averages toward zero, leaving the characteristic waveform that responds to the stimulus. With aging, the P300 shrinks and slows, shifting later in time, so the ERP carries an age signature.
For my PhD I ran a double-blind, placebo-controlled ERP study across 40 people, looking at what the reward beep in neurofeedback actually does. I found event-related spectral perturbations: event-related desynchronization when waves briefly fall out of phase from an amplitude increase, and event-related synchronization when amplitude drops and waves become more synchronous. Training left versus right hemisphere, and beta versus SMR versus sham, the brain burst in beta when I rewarded beta and in SMR when I rewarded SMR, with no contingent bursting under placebo reward. That is direct evidence of the learning loop inside SMR neurofeedback.
For understanding one person, I rarely need the ERP, because the same information shows up in ordinary endogenous EEG and QEEG: alpha speed, delta, cross-frequency coupling with the neurovascular signal. For basic science and for studying learning, the ERP is a remarkable tool. If you want the broader picture on whether neurofeedback holds up, see Is Neurofeedback Legitimate?.
What to Take from This Week
None of these five strategies requires special equipment, and the one that does, a smartphone, is already in most pockets. Use technology and stay socially engaged. Play an instrument or sing. Eat whole foods, move daily, and lower your toxic load. Protect deep slow-wave sleep. Build a meditation practice of about 20 minutes a day. Each one carries reasonable mechanism behind the correlation, and several show measurable shifts in brain age on EEG and metabolic markers. Pick one and start this week.