The human brain continuously generates intricate oscillatory electrical patterns that orchestrate cognition, affect, and behavior. Among these rhythmic signatures, alpha oscillations occupy a central functional role, serving as the physiological bridge between active engagement and tranquil rest. Alpha-wave training—a pioneering modality of electroencephalographic (EEG) biofeedback—empowers individuals to systematically modulate these endogenous frequencies through operant conditioning, unlocking vast potential for psychological equilibrium and cognitive enhancement.
Alpha-Wave Training
1. Concise Definition
Alpha-wave training refers to a specialized form of electroencephalographic (EEG) neurofeedback in which individuals learn voluntary self-regulation of their brain’s alpha-frequency band, typically spanning 8 to 12 Hertz (Hz). By receiving real-time auditory, visual, or tactile feedback contingent upon their current alpha-wave amplitude, coherence, or frequency, trainees systematically reinforce specific neural oscillatory states through operant conditioning paradigms.
Functionally, this biofeedback technique aims to cultivate states of internalized calm, alert relaxation, and optimal sensory processing. Rather than acting as a passive intervention, alpha-wave training relies on endogenous neuroplastic adaptations, enabling participants to consciously alter thalamocortical firing patterns without pharmacological agency.
2. Etymology & Linguistic Origin
The term is a modern compound deriving from scientific, neurological, and linguistic roots across multiple languages. “Alpha” originates from the Phoenician ‘alp (ox), which entered classical Greek as alpha (ἄλφα), denoting the first letter of the Greek alphabet. In 1929, German neuropsychiatrist Hans Berger designated the predominant 8–12 Hz oscillations observed over the posterior human scalp as “alpha waves” (Alpha-Wellen or Berger’s wave) simply because they were the first rhythmic neural phenomenon he identified using human electroencephalography.
“Wave” derives from Middle English wawe, which stems from Old English wafian (to fluctuate or move to and fro), capturing the undulating, oscillatory voltage variations recorded across the scalp. “Training” originates from the Old French trainer (to draw, drag, or guide), which traces back to the Vulgar Latin tragere and Classical Latin trahere. The combined phrase entered the clinical and psychiatric lexicon in the late 1960s to designate the systematic conditioning and shaping of these foundational electrophysiological rhythms.
3. Pronunciation & Grammatical Form
Pronunciation: The term is phonetically transcribed in International Phonetic Alphabet (IPA) as /ˈælfə weɪv ˈtreɪnɪŋ/.
Grammatical Form: “Alpha-wave training” functions syntactically as a compound noun phrase (uncountable). In psychological literature, it frequently appears in attributive or adjectival roles (e.g., “alpha-wave training protocols,” “alpha-wave training regimens”). When functioning as a dynamic clinical process, related nominalizations such as “alpha neurofeedback” or verbal variants such as “training alpha waves” are deployed interchangeably across peer-reviewed neuroscientific publications.
4. Detailed Conceptual Explanation
To comprehend alpha-wave training, one must examine the neurobiology of the 8–12 Hz electrical frequency band. Originally presumed to reflect an idle or resting state—an assumption stemming from its pronounced manifestation during relaxed, eyes-closed wakefulness—alpha oscillations are now recognized as reflecting an active mechanism of pulsed cortical inhibition. Governed primarily by the thalamocortical circuit, particularly the pulvinar and the reticular thalamic nucleus, alpha rhythms gate information flow across the cerebral cortex by rhythmically suppressing task-irrelevant sensory regions while preserving task-relevant cortical networks.
During a typical alpha-wave training session, surface electrodes are applied to specific scalp coordinates according to the international 10–20 system, commonly prioritizing occipital (O1, O2), parietal (P3, P4, Pz), or frontal (F3, F4) locations. The raw microvolt-level potential differences are amplified, digitized, and routed through band-pass filters to isolate the alpha bandwidth. Real-time digital signal processing translates alpha metrics—most commonly spectral power density or microvolt amplitude—into immediate sensory stimuli. For instance, an individual might hear a harmonic chime that increases in pitch or volume as alpha amplitude surpasses a calibrated baseline threshold, or observe a graphical visualization that broadens and illuminates as cortical synchrony consolidates.
The underlying mechanism of training is operant conditioning paired with implicit perceptual learning. Because individuals generally lack conscious interoceptive awareness of their raw EEG state, the immediate external feedback serves as an artificial sensory mirror. When the brain inadvertently enters a state characterized by elevated synchronous alpha activity, the continuous feedback acts as a positive reinforcer. Over repeated trials, the central nervous system identifies internal mental, somatic, and attentional correlates associated with that state, gradually stabilizing these oscillatory patterns through long-term potentiation and enhanced thalamocortical connectivity.
Moreover, modern research differentiates between the lower alpha sub-band (approximately 8–10 Hz) and the upper alpha sub-band (approximately 10–12 Hz). Lower alpha activity reflects generalized somatic relaxation, non-specific alertness, and reduced autonomic arousal. In contrast, upper alpha activity correlates strongly with task-specific memory retrieval, cognitive flexibility, and semantic processing capacity. Contemporary alpha-wave training protocols carefully differentiate between these sub-bands to address specific clinical or performance goals rather than applying uniform frequency reinforcement across all cortical zones.
5. Historical Development
The historical trajectory of alpha-wave training represents a fascinating intersection of neurophysiology, behavioral psychology, and cultural exploration. Following Hans Berger’s foundational discovery in 1929, alpha oscillations remained largely within the purview of basic neurophysiology and diagnostic neurology for three decades, viewed as diagnostic markers for epilepsy, tumors, or severe encephalopathies.
The paradigm shifted radically in 1958 at the University of Chicago, where experimental psychologist Dr. Joe Kamiya initiated seminal investigations into internal states. Kamiya set out to determine whether human participants could perceive their own ongoing brain rhythms. In a series of ground-breaking discrimination experiments, Kamiya presented an auditory bell whenever a subject entered an alpha state, asking the subject to guess whether their brain was currently producing alpha waves. Within a few days of reinforcement, subjects learned to differentiate between alpha and non-alpha states with near-perfect accuracy. Kamiya subsequently reversed the experimental design, demonstrating that participants could consciously evoke or suppress alpha rhythms at will when provided continuous auditory feedback.
Kamiya’s publication of these results in Psychology Today in 1968 ignited immense interest across both academic and popular spheres. During the late 1960s and 1970s, alpha-wave training coincided with the countercultural movement and the nascent human potential movement. Prominent figures associated alpha waves with higher states of consciousness, Zen meditation, and transcendent bliss. Commercial entities marketed rudimentary consumer alpha devices, leading to overstated claims regarding instantaneous enlightenment and effortless stress relief. This unscientific commercialization provoked significant skepticism within orthodox neuroscience, resulting in an academic backlash that momentarily stalled institutional funding and mainstream research.
During the 1980s and 1990s, the discipline underwent rigorous methodological rehabilitation. Researchers such as Joel Lubar, John Gruzelier, and James Hardt established stringent psychophysiological protocols, standardized impedance controls, and employed quantitative EEG (qEEG) topological mapping. The emergence of modern computational power enabled sophisticated spectral decomposition and real-time artifact subtraction, moving alpha-wave training out of countercultural laboratories and firmly into specialized clinical neuropsychology, psychiatric clinics, and elite athletic performance centers.
6. Theoretical Foundations
Alpha-wave training rests upon several robust, intersecting theoretical frameworks within cognitive neuroscience and learning psychology:
Operant Conditioning and Behavioral Shaping: In accordance with Skinnerian behavioral principles, dynamic physiological states can be systematically shaped when contingent reinforcement immediately follows target behaviors. In alpha training, the behavioral target is the synchronous firing of pyramidal neurons in the thalamocortical loop. Reinforcement reinforces the probability of the recurrence of this neural configuration.
The Inhibition-Timing Hypothesis: Formulated by cognitive neuroscientist Wolfgang Klimesch, this hypothesis asserts that alpha oscillations reflect active, top-down cortical gating rather than passive metabolic disengagement. Alpha synchronization effectively closes down unnecessary cortical channels to prevent task-irrelevant environmental distractions from interfering with focal processing. By training alpha oscillations, individuals are effectively refining their executive neural gating, enhancing their capacity to actively filter out sensory and cognitive noise.
Thalamocortical Resonance Theory: Formulated by Rodolfo Llinás, this model posits that rhythmic interactions between the thalamus and neocortex establish temporal binding windows necessary for conscious perception. Alpha rhythms represent a specific resonant frequency of these loops. Regulating alpha through neurofeedback alters the intrinsic temporal dynamics of these loops, directly modifying arousal levels, sensory thresholds, and vigilance states.
Activity-Dependent Neuroplasticity and Hebbian Learning: As summarized by the aphorism “neurons that fire together, wire together,” the deliberate, sustained induction of synchronized 8–12 Hz activity drives synaptic plasticity across cortico-cortical and thalamocortical pathways. Through persistent training sessions, these neuroplastic modifications alter basal baseline firing rates, enabling enduring behavioral and emotional stability that persists long after the training hardware is removed.
7. Key Components, Types & Dimensions
Alpha-wave training protocols can be deconstructed into multiple distinct dimensions, components, and methodologies:
- Sub-Band Specificity:
- Lower Alpha Training (8–10 Hz): Focuses on generalized nervous system down-regulation, muscular relaxation, autonomic balancing, and the amelioration of systemic stress.
- Upper Alpha Training (10–12 Hz): Emphasizes cognitive speed, working memory manipulation, spatial reasoning, and intellectual processing efficiency.
- Individual Alpha Frequency (IAF) Protocols: Modern protocols calibrate training relative to the subject’s unique peak alpha frequency rather than rigid 8–12 Hz cutoffs, correcting for individual biological variability, age, and baseline metabolic differences.
- Directional Modality:
- Alpha Upregulation (Enhancement): The subject is conditioned to increase the amplitude, power, or temporal persistence of alpha oscillations to achieve stress reduction, creative incubation, or pain relief.
- Alpha Downregulation (Suppression): The subject is conditioned to suppress alpha amplitude in target regions (such as the sensorimotor cortex or prefrontal zones) to overcome cognitive hypoarousal, enhance attention, or alleviate depressive rumination.
- Topographical Configurations:
- Posterior/Occipital Training (O1, O2, Oz): Focuses on primary sensory idling, visual gating, and holistic somatic calm.
- Frontal Alpha Asymmetry (FAA) Training: Calibrates the balance of alpha power between the left (F3) and right (F4) frontal lobes. Grounded in Richard Davidson’s affective neuroscience model, increasing left-sided frontal activity (indexed by reduced left frontal alpha) relative to right frontal activity is linked to approach-related motivation, resilience, and positive affect.
- Parietal-Temporal Training (Pz, P3, P4, T3, T4): Targets associative integration, sensory stabilization, and emotional balance.
- Feedback Modalities:
- Auditory Feedback: Tonal synthesis, polyphonic variations, or nature soundscapes calibrated directly to alpha spectral intensity. Auditory feedback is particularly useful for eyes-closed protocols.
- Visual Feedback: Dynamic animations, luminous changes, or video game parameters that advance only when the brain meets defined amplitude parameters. Visual feedback is primarily used in eyes-open protocols.
- Tactile/Multimodal Feedback: Vibrotactile arrays combined with audiovisual sensory loops to maximize operant integration.
8. Examples & Illustrative Cases
To understand how alpha-wave training operates in practical scenarios, consider the following hypothetical, representative cases illustrating clinical and optimal-performance applications:
Case 1: Clinical Intervention for Treatment-Resistant Anxiety
A 34-year-old corporate attorney presented with chronic generalized anxiety disorder (GAD), characterized by relentless cognitive hyperarousal, insomnia, and autonomic tension. Baseline quantitative EEG (qEEG) profiling revealed marked suppression of posterior alpha power accompanied by an excess of high-frequency beta (18–25 Hz) activity across parietal and central channels, indicating a state of continuous, non-restorative neurological vigilance. The clinician designed a 25-session lower-alpha (8–10 Hz) upregulation protocol localized at electrode sites Pz and Oz, utilizing an eyes-closed paradigm with auditory feedback. Initially, the patient struggled to produce alpha bursts longer than 0.5 seconds. By session 12, the patient developed internal somatic cues (combining diaphragmatic respiration and release of ocular muscle tension) that consistently elevated alpha amplitude. By session 25, average resting alpha power increased by 42%, correlating with a clinically significant 50% reduction on the Beck Anxiety Inventory (BAI) and normalized sleep architectural patterns.
Case 2: Elite Performance Enhancement in Professional Marksmanship
A competitive rifle shooter sought to improve performance stability under acute competitive pressure. High-level marksmanship demands a brief period of absolute sensory calm and autonomic stabilization during the final trigger squeeze—a phenomenon known in sports psychology as the “quiet eye” and characterized electrophysiologically by transient left-temporal and occipital alpha synchronization. The athlete underwent an upper-alpha (10–12 Hz) training regimen using an eyes-open, target-based visual feedback game. Over 15 sessions, the shooter learned to rapidly generate localized upper-alpha bursts immediately preceding trigger pull, actively suppressing cognitive interference from external crowd noise and autonomic stress. In national competition follow-ups, the athlete exhibited marked improvements in shot grouping consistency and reported entering “the zone” with deliberate, voluntary control.
9. Measurement & Assessment
Precise recording and assessment are vital for valid alpha-wave training. The process begins with rigorous physiological monitoring and technical preparation:
Electrode Placement and Impedance Standards: Practitioners use the international 10–20 or 10–10 system to place silver/silver chloride (Ag/AgCl) or gold-plated electrodes on the scalp. Ensuring low electrical impedance—typically kept strictly below 5 kilo-ohms (kΩ)—is essential to preserve microvolt signal integrity. Differential amplification compares the active site to reference sites (often linked earlobes, A1/A2, or the mastoid processes) with a designated ground connection.
Signal Processing and Spectral Analysis: Analog electrical signals are sampled at rates of 256 to 1024 Hz, amplified, and digitized via analog-to-digital converters (ADC). The digitized data stream is filtered using band-pass filters (typically 8–12 Hz) and processed using continuous Fast Fourier Transforms (FFT) or autoregressive modeling to calculate real-time power spectral density (PSD, measured in microvolts squared per Hertz: μV²/Hz). Modern systems also employ advanced wavelet transforms to provide higher temporal precision for transient alpha bursts.
Artifact Decontamination: Reliable training requires real-time artifact identification and rejection. Physiological interference such as eye blinks (electrooculogram, EOG), jaw clenching or neck tension (electromyogram, EMG), and cardiovascular pulses (electrocardiogram, ECG) can artificially inflate alpha power readings. Advanced neurofeedback software applies automated thresholds or online Independent Component Analysis (ICA) to subtract artifactual noise, ensuring reinforcement reflects true cortical oscillations rather than muscle contractions.
Baseline Profiling and Threshold Setting: Prior to intervention, clinicians record resting eyes-open and eyes-closed baselines to map the participant’s natural reactivity (such as the standard Berger effect, where alpha power rises dramatically when closing the eyes). Reinforcement thresholds are dynamically calibrated—often targeted so that feedback is delivered when the participant exceeds the 60th to 70th percentile of their baseline distribution—providing an optimal balance between challenge and reward that supports behavioral shaping.
10. Applications & Practical Significance
Alpha-wave training is utilized across a wide variety of clinical, corporate, artistic, and educational environments:
Anxiety and Mood Regulation: Given the inverse relationship between alpha oscillations and central nervous system hyperarousal, alpha enhancement is extensively applied in treating generalized anxiety, panic disorder, and post-traumatic stress disorder (PTSD). Re-establishing healthy alpha rhythms restores parasympathetic tone and downregulates overactive amygdalar circuits.
Frontal Alpha Asymmetry (FAA) in Major Depression: Protocols aimed at balancing left-versus-right frontal alpha activity directly target the affective vulnerabilities seen in major depressive disorder. Elevating left frontal cortical activity (evidenced by reduced left-sided alpha) helps restore approach-oriented behaviors, emotional resilience, and motivational engagement.
Chronic Pain Management: Chronic pain conditions, such as fibromyalgia and complex regional pain syndrome, frequently feature disrupted thalamocortical rhythms. Enhancing posterior and somatosensory alpha rhythms helps disrupt thalamocortical dysrhythmia, acting as a functional “gate” that attenuates the conscious perception of nociceptive signals.
Cognitive Optimization and Neuro-Ergonomics: In non-clinical populations, training upper-alpha frequencies improves mental rotation abilities, working memory maintenance, and selective attention. Pilots, surgeons, and corporate leaders use these protocols to sustain cognitive clarity under fatigue and maintain executive control during complex decision-making.
Artistic and Athletic Peak Performance: Alpha-wave training is frequently combined with theta-wave conditioning (in alpha-theta protocols) to foster creative divergence, deep states of psychological flow, and emotional catharsis in performing artists, musicians, and elite athletes seeking to overcome performance-inhibiting anxiety.
11. Research & Empirical Evidence
The scientific literature on alpha-wave training has matured through decades of investigation, progressing from early observational studies to modern, randomized sham-controlled trials and neuroimaging examinations.
In early research, Kamiya (1968) and Hardt and Kamiya (1978) demonstrated that healthy adults could consistently modulate their alpha amplitude when provided real-time acoustic feedback, and that successful upregulation correlated with marked reductions in trait anxiety. However, critics like Lynch and Paskewitz (1971) raised important methodological concerns, demonstrating that early alpha gains often reflected the simple removal of anxiety-induced blocks (such as visual attention and muscle tension) rather than a novel learned state—illustrating that alpha enhancement occurred naturally once environmental distractions were minimized.
Modern investigations addressed these early critiques by utilizing advanced control groups and objective neuroimaging. A landmark study by Hanslmayr, Sauseng, Doppelmayr, Schabus, and Klimesch (2005) established a causal link between upper alpha neurofeedback and cognitive performance. Participants trained to upregulate their upper alpha showed significant improvements on mental rotation tasks compared to non-trained or sham-control participants, demonstrating that alpha modulation directly alters cognitive processing capacity.
Neuroimaging and mechanistic studies have expanded our understanding of the anatomical changes driven by these protocols. Ros et al. (2013) demonstrated that a single session of voluntary alpha downregulation induced plastic changes in cortical excitability (measured via transcranial magnetic stimulation, TMS) and altered resting-state connectivity within the salience and default mode networks on functional magnetic resonance imaging (fMRI). Today, systematic reviews and meta-analyses conclude that while alpha-wave training demonstrates reliable clinical efficacy for stress-related disorders and cognitive gating, its therapeutic outcomes depend heavily on individualized protocol design, precise electrode montage selection, and adequate session duration (typically requiring 20 to 40 sessions for lasting neuroplastic remodeling).
12. Cultural & Cross-Cultural Considerations
The cultural trajectory of alpha-wave training reflects contrasting approaches between Western scientific paradigms and Eastern philosophical traditions. When the phenomenon gained public attention in the late 1960s, Western researchers noted striking electrophysiological parallels between the brains of experienced Zen monks and Indian yogis and individuals undergoing alpha biofeedback. Pioneer studies by Kasamatsu and Hirai (1966) showed that Zen masters engaged in zazen meditation demonstrated spontaneous, prominent alpha synchronization across all cortical regions even with their eyes open—a state reflecting an unattached yet fully awake awareness of the surrounding environment.
In the West, this observation spurred an effort to use technological biofeedback as an “accelerated meditation” tool, attempting to recreate in weeks what traditional contemplative practices required decades to achieve. However, contemplative scholars and cross-cultural anthropologists often critiqued this approach as reductionist, arguing that isolating an electrophysiological metric overlooks the ethical, philosophical, and introspective foundations essential to mindfulness and meditative wisdom.
In modern clinical practice, cultural perceptions of technology, mental illness, and mind-body balance significantly influence patient adherence. In societies that place high value on active, self-directed wellness, neurofeedback is readily accepted as an empowering, non-stigmatizing, and non-pharmacological treatment. Conversely, in healthcare environments where top-down medical interventions are the norm, patients may struggle with the open-ended, self-directed nature of operant conditioning, requiring clinicians to provide culturally adapted education on the brain’s capacity for self-regulation.
13. Criticisms, Debates & Limitations
Despite its widespread clinical adoption and established research base, alpha-wave training faces several ongoing academic debates, methodological critiques, and practical limitations:
The Placebo Effect and Non-Specific Factors: A prominent criticism, articulated by researchers such as Thibault, Lifshitz, and Raz (2016), centers on the role of non-specific psychological factors. The impressive technological setting of a neurofeedback clinic—complete with scalp electrodes, specialized amplifiers, real-time computerized displays, and regular interactions with supportive clinicians—creates a powerful therapeutic ritual. Skeptics argue that observed reductions in anxiety and stress may stem largely from participant expectations, immersive relaxation environments, and placebo mechanisms rather than precise operant modulation of the underlying EEG frequency band.
Methodological Inconsistencies and Sham Controls: Double-blind, sham-controlled studies—where a control group receives feedback linked to a pre-recorded or synthetic EEG signal—have yielded mixed outcomes. While some studies demonstrate that real-contingent feedback outperforms sham protocols, others show comparable clinical improvements across both groups, raising difficult questions regarding the biological necessity of strict reinforcement contingency for certain psychological outcomes.
The Non-Responder Phenomenon: An estimated 15% to 30% of participants fail to develop deliberate voluntary control over their electroencephalographic parameters despite sustained training, a pattern often termed the “neurofeedback non-responder” problem. Neurobiological factors, including individual variations in thalamocortical anatomy, white matter tract integrity, baseline metabolic status, and psychological frustration, can impede successful operant conditioning.
Commercialization and Unregulated Consumer Tech: The proliferation of direct-to-consumer EEG headbands and mobile wellness apps has revived concerns regarding commercial overreach. Many consumer-grade devices utilize dry, single-channel sensors that are highly susceptible to sweat, eye movement, and muscle artifacts. Marketing these devices with unvalidated claims of cognitive transformation risks trivializing the field and spreading ineffective practices among consumers.
14. Related Terms & Distinctions
To avoid diagnostic and conceptual confusion, alpha-wave training must be distinguished from several related interventions and neuroscientific constructs:
- Alpha-Theta Neurofeedback: A combined protocol where participants first enhance alpha waves to reach somatic relaxation, then transition into increasing slower theta waves (4–8 Hz) to foster deep hypnagogic imagery, creative exploration, and the resolution of psychological trauma.
- Sensorimotor Rhythm (SMR) Training: Targets a localized 12–15 Hz oscillation over the sensorimotor strip (C3, Cz, C4). Unlike posterior alpha training, SMR training specifically suppresses motor execution and bodily restlessness, and is widely utilized in the treatment of ADHD and motor tics.
- Theta/Beta Ratio (TBR) Neurofeedback: A well-documented protocol designed for attention-deficit/hyperactivity disorder (ADHD) that trains individuals to downregulate slow theta waves while upregulating faster beta activity, focusing on active executive concentration rather than relaxed, sensory-gated calm.
- Heart Rate Variability (HRV) Biofeedback: A peripheral biofeedback technique that trains respiratory sinus arrhythmia and autonomic flexibility through cardiovascular metrics rather than direct central nervous system oscillations.
- Mindfulness Meditation: A behavioral and cognitive practice involving sustained, non-judgmental attention. While meditation often leads to spontaneous alpha synchronization, it does so through endogenous cognitive practices without the use of external EEG monitoring or external sensory feedback loops.
15. Summary & Key Takeaways
Alpha-wave training represents a milestone in applied psychophysiology, providing a practical method to bridge objective neuroelectric activity and subjective awareness. By utilizing operant conditioning to regulate the brain’s 8–12 Hz oscillations, this technique enables individuals to consciously engage the thalamocortical networks that gate sensory processing, reduce autonomic hyperarousal, and support balanced cognitive functioning.
While continuing debates surrounding placebo contributions and the need for standardized double-blind methodologies warrant ongoing scientific scrutiny, alpha-wave training remains an established, versatile, and non-invasive modality. Supported by contemporary insights into activity-dependent neuroplasticity and refined by high-resolution signal processing, alpha-wave training offers a valuable tool for restoring affective balance in clinical populations and unlocking cognitive potential in high-performance domains.
References
- Berger, H. (1929). Über das Elektrenkephalogramm des Menschen. Archiv für Psychiatrie und Nervenkrankheiten, 87(1), 527–570. https://doi.org/10.1007/BF01797193
- Hanslmayr, S., Sauseng, P., Doppelmayr, M., Schabus, M., & Klimesch, W. (2005). Increasing individual upper alpha power by neurofeedback improves cognitive performance in human subjects. Applied Psychophysiology and Biofeedback, 30(1), 1–10. https://doi.org/10.1007/s10484-005-2169-8
- Hardt, J. V., & Kamiya, J. (1978). Anxiety change through electroencephalographic alpha feedback seen only in high anxiety subjects. Science, 201(4350), 79–81. https://doi.org/10.1126/science.663641
- Kamiya, J. (1968). Conscious control of brain waves. Psychology Today, 1(11), 56–60.
- Klimesch, W. (2012). Alpha-band oscillations, attention, and controlled access to stored information. Trends in Cognitive Sciences, 16(12), 606–617. https://doi.org/10.1016/j.tics.2012.10.007
- Ros, T., Théberge, J., Frewen, P. A., Kluetsch, R., Densmore, M., Calhoun, V. D., & Lanius, R. A. (2013). Mind over chatter: Plastic up-regulation of the fMRI salience network directly after EEG neurofeedback. NeuroImage, 65, 324–335. https://doi.org/10.1016/j.neuroimage.2012.09.046
- Thibault, R. T., Lifshitz, M., & Raz, A. (2016). The psychology of neurofeedback: Clinical intervention even if applied sham. The American Psychologist, 71(7), 847–860. https://doi.org/10.1037/a0040339