Glossary
The science ONDA builds on — HRV, the vagus nerve, resonance breathing, autonomic regulation and interoception — plus the wider neuroscience terms behind the ONDA system. Scientific terms and ONDA's own concepts are labelled.
[ FEATURED TERMS ]
Biocomputer
The human body viewed as a complex biological computing system capable of running consciousness programs.
Firmware Update
A structured practice session that rewrites deep biological programs — breathing patterns, stress responses, emotional regulation.
Psycho-Neural Network
The interconnected web of psychological patterns and neural pathways that form your behavioral operating system.
Molecular Psychology
A research field linking genes, brain chemistry and brain systems to differences in personality, emotion and behaviour.
Interoception
The sense of the internal state of your body — heartbeat, breathing, gut signals, temperature, hunger.
OND Tokens
The internal reward currency earned through completed practices — converting consciousness work into measurable progress.
Homeostasis
The body's ability to maintain stable internal conditions — temperature, pH, blood sugar — despite external changes.
Primary Interoception
The basic layer of body sensing — signals from the heartbeat, breath, gut and internal organs.
Metabolism
The sum of all chemical reactions in the body that convert food into energy and building materials for cells.
Metabolic Flexibility
The ability of mitochondria to seamlessly switch between glucose and fat (ketones) as fuel sources based on availability and demand.
Insulin Sensitivity
How responsive your cells are to insulin — high sensitivity means efficient glucose uptake and fat-burning capability.
Glucose Spikes
Rapid rises in blood sugar after eating — followed by insulin spikes and energy crashes. A sign of glucose-locked metabolism.
Mitochondria
The cellular power plants — produce ATP from glucose and fatty acids. Metabolic flexibility depends on their health.
ATP
Adenosine triphosphate — the universal energy currency of life. Produced by mitochondria from glucose and fat.
Ketosis
A metabolic state where the body burns fat and produces ketones for fuel — a high-performance alternative to glucose.
Autophagy
The cellular cleanup process that removes damaged proteins and organelles — "deletes damaged code" for cellular renewal.
Ketones
Molecules produced from fat when glucose is low — beta-hydroxybutyrate (BHB) and others. A "cleaner" fuel for the brain.
Brain
The central organ of the nervous system — a biological supercomputer processing 11 million bits of sensory information per second.
Mind
The emergent phenomenon of consciousness arising from brain activity — the "software" running on biological "hardware."
Vagus Nerve
The tenth cranial nerve, linking the brain with the heart, airways and gut — mostly carrying signals from the organs to the brain.
Mammalian Dive Reflex
A set of physiological responses to cold water immersion that optimizes respiration and slows the heart rate, mediated by the vagus nerve.
Thalamus
The brain's sensory relay station — filters and routes incoming sensory information to the cortex.
Proto-consciousness
The most basic form of awareness — pre-reflective sensing of existence before thought or emotion.
Physiological Rhythms
The natural oscillating patterns of the body — heartbeat, breath, gut motility, circadian cycles.
Hypothalamus
The brain's master regulator of homeostasis — temperature, hunger, thirst, sleep, and stress response.
Psychoneuroimmunology
The study of links between mind, nervous system, and immune function — how mental states affect immunity.
Diaphragm
The primary respiratory muscle — a dome-shaped sheet separating chest and abdomen, central to breath and vagal tone.
Parasympathetic Nervous System
One of the two main branches of the autonomic nervous system — slows the heart through the vagus nerve and supports digestion and recovery.
Sympathetic Nervous System
One of the two main branches of the autonomic nervous system — speeds the heart and mobilises the body for action.
Insula
The insular cortex — the brain's key region for processing signals from inside the body.
Cortisol
The primary stress hormone — released by the adrenal glands, elevated in chronic stress.
Peristalsis
The wave-like muscular contractions that move food through the digestive tract.
Heart Rate Variability
The variation in time between heartbeats — a key marker of nervous system flexibility and recovery capacity.
RMSSD
Root mean square of successive differences — the standard short-term HRV metric for beat-to-beat changes in heart rhythm.
SDNN
Standard deviation of the intervals between normal heartbeats — the overall spread of heart-rhythm variation in a recording.
HRV Baseline
Your own normal range for HRV and related signals, built from your recent nights — the reference a new reading is compared with.
Central Pattern Generators
Spinal cord circuits that generate rhythmic movement patterns — the neural basis of "autopilot" locomotion.
Vestibulo-Ocular Reflex
The reflex that stabilizes gaze during head movement — keeps vision clear while moving.
Vestibular System
The inner ear balance system — the body's primary gyroscope for orientation and spatial awareness.
Cerebellum
The "little brain" — coordinates movement, balance, and motor learning; modulates smoothness.
Fascia
The connective tissue web that wraps muscles and organs — transmits force through the body.
Neurophysiology
The study of how the nervous system functions — from single neurons to brain-wide circuits.
Reticular Formation
A network in the brainstem that regulates arousal, consciousness, and motor control.
Sensorimotor Cortex
The brain region that integrates sensation and movement — the primary motor and somatosensory cortex.
Locomotion
The ability to move through space — walking, running, swimming — driven by spinal pattern generators.
Body Armor
Chronic muscular tension that holds repressed emotions — a concept from Wilhelm Reich, widely used in body-oriented therapy.
Polyvagal Theory
Stephen Porges' theory of the vagus nerve, a debated model — it proposes three neural states: ventral vagal (safety), sympathetic (mobilization), dorsal vagal (shutdown).
Neuroception
The brain's unconscious detection of safety or threat — happens before conscious perception.
Neuroplasticity
The brain's ability to reorganize itself by forming new neural connections throughout life.
BDNF
Brain-Derived Neurotrophic Factor — the "Miracle-Gro" for your brain. Supports neuron survival and growth.
Myelin
The insulating sheath around neural pathways — increases signal speed. Rapid myelination = rapid skill acquisition.
HPA Axis
Hypothalamus-Pituitary-Adrenal axis — the body's central stress response system that releases cortisol.
Proprioception
The sense of body position and movement in space — "where am I" and "how am I moving."
Lymphatic System
The body's drainage network — clears metabolic waste and supports immune function; pumped by muscle movement.
Motor Cortex
The brain region that sends movement commands to muscles — primary motor cortex (M1) and premotor areas.
Neurobiology
The study of the nervous system at all levels — from molecules and cells to circuits and behavior.
Cognitive System
The brain networks involved in thinking, attention, memory, and decision-making — slower than sensory-motor processing.
Neuroendocrinology
The study of interactions between the nervous system and endocrine system — how the brain regulates hormones.
Pituitary Gland
The "master gland" at the base of the brain — regulates growth, stress response, and other hormones.
Adrenal Glands
Small glands above the kidneys that release cortisol and adrenaline — the stress hormones.
Adrenaline
Epinephrine — the hormone that mobilizes the body for action; released by the adrenal medulla.
Lymphology
The study of the lymphatic system — drainage, immune function, and the role of movement in lymph flow.
DHEA
Dehydroepiandrosterone — the hormone of vitality and longevity; precursor to sex hormones.
Testosterone
The main male sex hormone, also made in women; supports muscle, bone, sex drive and red blood cells. Links to dominance are weak.
Thymus
The gland behind the breastbone that trains T-cells — links immune function with social safety.
Basal Ganglia
Deep brain structures that control movement, posture, and habit formation — "unshakeable" stability.
Endocrine System
The system of glands that release hormones into the bloodstream — regulates metabolism, growth, stress, and reproduction.
Gonads
The reproductive glands — testes and ovaries — produce sex hormones (testosterone, estrogen).
Autonomic Nervous System
The involuntary nervous system — regulates heart, breath, digestion, and stress response.
Ventral Vagus
A term from polyvagal theory (a debated model) for myelinated vagal fibres linked in the theory with calm social engagement.
Quantum Biology
The study of quantum effects in biological systems — coherence, biophotonics, and cellular communication.
Coherence
Synchronized, ordered oscillation — in physics, in the heart rhythm during slow breathing, and, as an ONDA image, the sense of "density of presence."
Biophotonics
The study of light emission from living systems — ultra-weak photon emission and possible cellular signaling.
Limbic System
The emotional brain — a network of structures that process emotions, memory, and social behavior.
Mirror Neurons
Neurons that fire when we observe others' actions — the biological basis of empathy and social intuition.
Oxytocin
A hormone for labour, breastfeeding and bonding. Its "trust hormone" reputation is oversimplified: effects depend on context and person.
Anterior Cingulate Cortex
The brain region for conflict monitoring, social sensing, and emotional regulation.
Emotional Osmosis
An ONDA Life term for “catching” other people’s emotions while keeping your own center. The scientific term is emotional contagion.
Social Sensing
The brain's ability to process social signals — gaze, tone, posture, micro-expressions — often below conscious awareness.
Norepinephrine
A neurotransmitter that enhances alertness, attention, and inhibitory control — supports cognitive clarity.
Prefrontal Cortex
The brain's command center for executive functions — attention, planning, inhibition, and cognitive control.
Dorsolateral Prefrontal Cortex
The dlPFC — supports cognitive clarity, working memory, and sustained focus.
Visual Cortex
The brain region that processes visual information — V1 through V5, from raw input to complex perception.
Biofeedback
Real-time feedback of physiological signals — learning to consciously regulate heart rate, brain waves, muscle tension.
P300
The brain's electrical response to something significant, novel, or expected in the information stream — an ERP component.
Saccades
Rapid, ballistic eye movements that shift gaze from one point to another — the basis of visual scanning.
Theta State
Brain waves in the 4–8 Hz range — associated with deep relaxation, meditation, and creative insight.
Alpha State
Brain waves in the 8–12 Hz range — associated with relaxed wakefulness and focused attention.
Cognitive Gap
The pause between an event and our reaction — the space where freedom of choice is born.
Default Mode Network
The "mind-wandering" network — active when we're not focused on the external world; suppressed during deep focus.
Dorsal Attention Network
The network for voluntary, goal-directed attention — top-down control of focus.
Acetylcholine
A neurotransmitter that "highlights" relevant neural connections — supports attention and learning.
Locus Coeruleus
The brainstem nucleus that produces norepinephrine — regulates alertness and attention.
Dopamine
The neurotransmitter of motivation and reward — supports working memory and sustained focus.
Ventral Tegmental Area
The brainstem nucleus that produces dopamine — core of the reward and motivation circuitry.
Nucleus Accumbens
The brain's reward hub — integrates motivation, pleasure, and goal-directed behavior.
Ultradian Rhythm
Biological cycles shorter than 24 hours — e.g., 90-minute focus cycles, 20-minute rest.
Gamma Binding
Synchronization of neurons at gamma frequency (30–100 Hz) — assembles scattered perceptual elements into a coherent whole.
Cholinergic Modulation
The regulation of neural activity by acetylcholine — enhances attention and selectively amplifies relevant signals.
Neurotransmitters
Chemical messengers that transmit signals between neurons — dopamine, serotonin, norepinephrine, acetylcholine, and others.
Beta Rhythm
Brain waves in the 12–30 Hz range — associated with active thinking, focus, and alert wakefulness.
Frontal Lobes
The front part of the brain — executive functions, planning, attention, and motor control.
Hippocampus
The brain structure for memory formation and spatial navigation — reconstructs past experiences to model future scenarios.
Predictive Coding
The brain's model of reality — predicts sensory input and updates based on prediction errors.
Posterior Parietal Cortex
The brain region for spatial representation, attention, and integrating body with environment.
Reticular Activating System
The brainstem network that filters sensory input and regulates arousal — can be tuned to notice what matches your vision.
Galvanic Skin Response
Changes in skin conductance due to emotional arousal — a biomarker that the body "believes" in the mental image.
Flow State
A state of optimal performance — deep immersion, effortless action, and loss of self-consciousness.
Hormones
Chemical messengers released by endocrine glands — regulate metabolism, stress, growth, and emotional states.
Occipital Cortex (V1–V4)
The primary visual cortex — processes and renders images; V1–V4 are the hierarchical stages of visual processing.
γ-Synchronization
High-frequency neural oscillation (30–100 Hz) that binds scattered brain regions into a unified conscious experience.
Medial Prefrontal Cortex (mPFC)
The inner prefrontal region for self-reflection, value judgment, and mental simulation of future scenarios.
Proactive Programming (RAS)
Tuning the Reticular Activating System to automatically notice opportunities that match your internal vision.
Neural Reframing
Using cognitive metaphors and new interpretations to alter synaptic connections and change behavioral patterns.
Synaptic Connections
The junctions between neurons where signals are transmitted — the physical substrate of learning and memory.
Broca's Area
The brain region for speech production — assembles and delivers the motor programs of language.
Wernicke's Area
The brain region for language comprehension — processes and interprets spoken and written words.
Amygdala
The brain structure for threat detection and emotional reactivity — the source of social fear and anxiety.
Thyroid Gland
The endocrine gland that regulates metabolic tempo — the driver of energy and manifestation.
Cognitive Reappraisal
A prefrontal technique that reframes emotional stimuli — physiologically dampens amygdala and replaces fear with excitement.
Theory of Mind (ToM)
The ability to attribute mental states to others — understanding perspectives, intentions, and beliefs.
Orbitofrontal Cortex
The prefrontal region for social harmony, value judgment, and ethical choices in the moment.
Right Temporoparietal Junction (rTPJ)
The brain region for reading non-verbal signals and managing the mental model of others.
Vasopressin
The hormone of boundary protection and pair-bonding — balances trust (oxytocin) with territorial defense.
Inter-brain Synchrony
The phenomenon where brain rhythms of partners begin to operate in a coherent mode during interaction.
Interference
In physics: when two waves overlap, creating a new, complex pattern. In ONDA: the moment of genuine interaction between two people.
Feelings
Subjective emotional experiences — the felt sense of what we value, desire, or experience in relation to ourselves and others.
Emotions
Multicomponent responses — physiological, behavioral, and experiential — to internal or external events.
Thoughts
Mental representations — ideas, beliefs, inner speech — generated by the cognitive system.
Sensations
Raw sensory input — what we feel in the body before interpretation (interoception, proprioception, touch).
Pelvic Diaphragm
The muscular floor of the pelvis — supports organs, regulates breath and tone; chronic stress can create deep blocks here.
Joint Attention
The shared focus of two or more individuals on the same object or goal — the center of group synergy.
Endorphins
Endogenous opioids that reduce pain and produce euphoria — the "hormonal glue" of collective cohesion.
Neural Coupling
The state where neural patterns of two or more individuals mirror one another — entering a shared neural field.
Synchronization
The alignment of rhythms across systems — breath, heart, brain waves — between individuals or within the body.
Oxytocin System
The neurohormonal network for trust, bonding, and social cooperation — the biochemical foundation of "We."
Inter-brain Coherence
The phenomenon where brain rhythms of multiple individuals operate in a coherent, phase-aligned mode.
Circadian Rhythm
Internal 24-hour cycles that regulate sleep-wake patterns, hormone levels, and metabolism — your biological clock.
Suprachiasmatic Nucleus
The master clock in the hypothalamus — receives light via the retina and synchronizes every cellular clock in your body.
Melatonin
The sleep hormone — released by the pineal gland in darkness, triggers the body's shutdown sequence.
Adenosine
A neuromodulator that builds up during wakefulness — the "sleep debt" variable that drives sleep pressure.
Blue Light
Short-wavelength light that suppresses melatonin and signals the SCN that it's daytime — a "digital caffeine" at night.
Deep Sleep
Slow-wave sleep (N3) — the most restorative phase, when the brain clears adenosine and repairs tissue.
Enteric Nervous System
The "second brain" — over 100 million neurons lining the gut, capable of independent function and influencing mood and mental clarity.
Serotonin
A chemical messenger that helps regulate mood, sleep, appetite and gut movement. Most is made in the gut, but gut serotonin does not reach the brain.
Microbiome
The community of trillions of bacteria, fungi, and viruses in your gut — your "biological modem" for gut-brain communication.
Blood-Brain Barrier
A selective membrane that controls which molecules enter the brain from the bloodstream — protecting and filtering neural tissue.
CO2 Tolerance
Your body's ability to tolerate elevated CO2 before triggering a breath urge — like RAM for metabolic stress resilience.
Nitric Oxide
A vasodilator made in the paranasal sinuses — nasal breathing carries it into the lungs, where it is proposed to aid oxygen uptake.
tDCS
Transcranial Direct Current Stimulation — non-invasive electrical modulation of neuronal excitability thresholds.
CES
Cranial Electrotherapy Stimulation — low-current stimulation to harmonize Alpha and Delta wave frequencies before sleep.
F3 Zone
EEG 10-20 system coordinate over the left Dorsolateral Prefrontal Cortex (DLPFC).
Myokines
Signaling molecules released by muscle contraction; communicate with brain and other organs (e.g., BDNF).
Sarcopenia
Age-related loss of muscle mass — the biological equivalent of battery degradation.
BPC-157 / TB-500
Peptides that accelerate angiogenesis and tissue repair during high-stress training cycles.
CHM
Continuous Hormone Monitoring — the idea of tracking hormones like cortisol with wearable sensors; research-stage only, no validated consumer device.
Lipolysis
Breakdown of stored fat into fatty acids and glycerol for energy, mainly regulated by insulin and adrenaline.
Free Hormonal Index
Bioavailable fraction of hormones (e.g., free testosterone) available to tissues.
Glymphatic Pathway
The brain's clearance system; activates during deep sleep to remove metabolic waste (e.g., beta-amyloid) via CSF circulation.
CSF
Cerebrospinal Fluid — the fluid that washes through brain tissue during glymphatic clearance.
DEEP_MAINTENANCE
Deep sleep phase where ~90% of glymphatic clearance occurs; requires temperature drop and insulin absence.
CPG
Central Pattern Generator — autonomous spinal cord circuits that produce rhythmic movement without continuous cortical input.
Mutual Inhibition
Neurons that inhibit each other alternately; creates the biological equivalent of a pendulum or clock.
Ground Contact Time
Duration of foot contact during gait; lower and symmetrical = more efficient CPG.
Bohr Effect
The phenomenon whereby hemoglobin releases oxygen more readily when CO₂ is present; low CO₂ = oxygen stays locked on hemoglobin.
BOLT
Body Oxygen Level Test — breath-hold duration after normal exhale; 40+ seconds = optimized gas exchange.
Hypercapnic Stress
Controlled exposure to elevated CO₂; trains chemoreceptors to tolerate higher concentrations.
ATP Synthase
An enzyme-rotor. Visualize it as a hydroelectric turbine where protons flow through to drive rotation, creating ATP "energy batteries."
mtDNA (Mitochondrial DNA)
The mitochondria's own genetic code, distinct from nuclear DNA. It is highly susceptible to toxins and oxidative radiation.
Photobiomodulation (PBM)
The use of non-ionizing light (lasers or LEDs) to trigger photochemical changes within cellular structures.
Water Viscosity
Resistance to flow. Lowering the viscosity of water surrounding proteins accelerates the rate of biochemical reactions.
NIR (Near Infra-Red)
The 700–1400nm light spectrum. NIR penetrates deeper into biological tissue than visible red light.
Senescence
A state where a cell enters permanent growth arrest but remains metabolically active, causing damage to its surroundings.
Apoptosis
Programmed cell death. A clean, non-inflammatory way for the system to decommission faulty hardware.
SASP
The toxic "cocktail" of cytokines and proteases secreted by zombie cells.
Quercetin & Fisetin
Polyphenols that act as "scaffolds" for senolytic activity, targeting specific survival pathways in old cells.
DunedinPACE
A specialized epigenetic clock that measures the speed at which your system is currently aging.
Predictive Modeling
Using historical data and machine learning to forecast future biological states.
Biological Signature
The unique, multi-variate pattern of your biomarkers when your system is in optimal health.
Micro-Drift
Subtle, trending changes in data (e.g., +2 bpm in RHR over 3 nights) that precede a systemic crash.
Telemetry
The automated communication process by which your biological data is collected and transmitted for analysis.
Phase-Locked
Synchronizing an external signal (sound) with an internal biological rhythm (brain waves).
Slow-Wave Sleep (SWS)
The deepest phase of non-REM sleep, crucial for memory consolidation and physical repair.
Delta Waves
Brain oscillations between 0.5 and 4 Hz. The signature of deep, restorative rest.
Glymphatic System
The waste-clearance system of the Central Nervous System, primarily active during Deep Sleep.
Bone Conduction
Transmitting sound through the skull bones directly to the inner ear, bypassing the eardrum to avoid waking the user.
Binaural Beats
An auditory illusion created by playing two slightly different frequencies in each ear; the brain "perceives" the difference as a third, pulsing tone.
Frequency Following Response (FFR)
The brain's tendency to synchronize its dominant EEG frequency with the frequency of an external stimulus.
Closed-Loop System
A control system that uses its output (real-time EEG data) as an input to adjust its performance (audio frequency).
Neurodynamics
The study and optimization of nerve mobility — how nerve trunks slide relative to surrounding tissues to prevent signal compression.
Posterior Cingulate Cortex (PCC)
A key node of the Default Mode Network that supports self-referential thought and the sense of "outsideness" relative to experience.
Central Executive Network (CEN)
The attention network that maintains sharp, directed focus — activated for goal-directed tasks and meta-attention.
Somatosensory Cortex (S1/S2)
The brain region that processes tactile, proprioceptive, and body-position information — the primary map of bodily sensation.
Brainstem
The oldest part of the brain — connects spinal cord to cerebellum and cortex; regulates arousal, breathing, heart rate, and survival reflexes.
Body Schema
The brain's dynamic representation of body position and boundaries in space — "where I am" in relation to the environment.
C-Tactile Fibers
Specialized nerve fibers that transmit "affective" touch — slow, gentle stroking linked to well-being and social bonding.
Co-regulation
The ability to regulate one's emotional state through another person — mutual calming and stabilization in social contact.
Tensegrity
The body as a tension-compression architecture — fascia and connective tissue form a continuous global information network.
Vasomotricity
The regulation of blood vessel tone — smooth muscle control of vessel diameter for blood flow and heat distribution.
Premotor Cortex
The brain region that plans and prepares movement — integrates sensory input with motor output; site of mirror neurons.
Range Fractionation
A biohacking method that distributes stimulus intensity across extreme ranges instead of targeting a single average point — forcing constant system recalibration and bypassing homeostatic stagnation.
Leptin
A peptide hormone synthesized by fat cells that functions as the Master Energy Sensor of the human architecture. Its receptor sensitivity is directly calibrated by the Photic Signal and circadian rhythm.
Insulin
An anabolic hormone secreted by the pancreas, classified in the ONDA architecture as the Master Storage Key. It manages glucose distribution from the bloodstream into cells and governs the system's storage vs. oxidation mode.
Glucagon
A peptide hormone secreted by the pancreas, classified in the ONDA architecture as the Master Retrieval Key. It activates stored energy release and switches the system from Storage Mode to Resource Utilization.
Heat Shock Proteins
Molecular chaperones made by cells under thermal stress that help repair damaged proteins and protect cells against heat and cold-induced damage.
Antifragility
A biological property of systems that grow stronger and more adaptive under stress, volatility, and disorder — the functional opposite of fragility.
Adiponectin
A protective hormone secreted by fat tissue that enhances insulin sensitivity and provides anti-inflammatory protection to the vascular system. Classified in ONDA as the Metabolic Optimizer.
AMPK
AMP-activated protein kinase — the internal energy sensor within every cell. In ONDA, classified as the Metabolic Master Switch: when cellular fuel drops, AMPK triggers fat burning, autophagy, and mitochondrial biogenesis.
Ghrelin
A hormone synthesized primarily in the stomach — classified in ONDA as The Hunger Prompt. The primary peripheral signal that stimulates the hypothalamus to seek energy, with a direct link to sleep quality and dopamine reward circuits.
Allostatic Load
The cumulative "wear and tear" on the body from chronic stress adaptation — defined in ONDA as System Debt. Tracked via HRV as the primary biometric marker of biological bankruptcy risk.
Hormesis
A biological phenomenon where low-dose stressors exert a stimulating, beneficial effect. In ONDA, classified as System Strengthening Stress — the process of calibrating internal defenses to make cells more resilient.
Cortex Stack
The hierarchical set of neural processes centered in the Prefrontal Cortex responsible for Executive Control. In ONDA, the "Operating System" that suppresses impulses in favor of long-term strategic goals.
Motivational Salience
The signal that decides where computational and physical resources are allocated — generated primarily by the Ventral Tegmental Area.
Prediction Error
The neural delta between expected and actual outcomes — the core signal driving dopamine release and ACC conflict monitoring.
Acetylcholine Lens
The biological lens of attention — acetylcholine modifies synaptic gain so relevant signals brighten and background noise fades.
System Jitter
Background neural noise that lowers signal-to-noise ratio across cognition — generated by overdriven reward circuitry, low CO2 or structural compression.
Hydraulic Viscosity
Internal friction of blood — the parameter that governs how much energy the heart and vascular tone spend to push nutrients to the cortex.
About this glossary
A plain-language reference for the vocabulary of the nervous system and self-regulation — HRV, RMSSD, vagal tone, coherence, resonance frequency, interoception and the rest. Each term has a short definition you can read in a sentence and a fuller entry with the mechanism and cross-links to related terms.
Terms marked with an amber “ONDA” tag are our own framing or product vocabulary, not established scientific terms — we label them so you always know which is which. Everything else is standard terminology, defined as the field uses it and, where it matters, linked to the evidence.
For the applied side, see what ONDA measures and the HRV biofeedback explainer.