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The Science Glossary · v1

A plain-English
guide to your nervous system.

Thirty-six scientific terms that appear across SomaLofi sessions — cortisol, the vagus nerve, the 3AM brain, the polyvagal theory behind why a voice in the dark can make the body unclench. Each entry explains what it is, why it matters, and how it shows up in real life. No medical degree required.

36Terms
7Categories
5mTo skim · 40m to read
Your nervous
system
runs without asking
Amygdala Cortisol Vagus Nerve Polyvagal Default Mode HRV BAG Protocol
Inhale 5.5 / min
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A
Section A

The nervous system

The command network of the body — it runs your heartbeat, your breathing, your stress response, your ability to fall asleep. Most of what SomaLofi does works at this level.

06 terms
Nervous System · Featured 01 · 36

The Vagus Nervevay-gus

The superhighway between your brain and your body — the main route the parasympathetic system uses to activate rest.
What it is
The vagus nerve is the longest cranial nerve in the body. It runs from the brainstem through the neck, chest, and abdomen, connecting the brain to the heart, lungs, gut, and other organs. It is the primary pathway of the parasympathetic nervous system.
Why it matters
Vagal tone — how active and healthy the vagus nerve is — is one of the strongest predictors of emotional regulation, resilience, and recovery from stress. You can actively increase it through slow breathing, extended exhales, humming, and certain forms of sound exposure.
In SomaLofi scripts
Extended-exhale breathwork sessions specifically target vagal activation. The sound of the Arcs — particularly rain and stream — also stimulates the vagal pathway.
cranial nerve X
brain → heart → gut
Nervous System 02

The Autonomic Nervous Systemaw-toh-nom-ik

The part of your nervous system that runs automatically — you do not have to think about it for it to work.
What it is
The autonomic nervous system (ANS) controls breathing, heart rate, digestion, hormone release, and the stress response. It has two main divisions — the sympathetic and parasympathetic systems — that work like opposing forces to keep the body balanced.
Why it matters
Almost everything that goes wrong with sleep, anxiety, and stress involves the ANS being out of balance. When it tips too far into the sympathetic (alert) state, you cannot rest.
In SomaLofi scripts
'Your nervous system cannot switch off' means the ANS is stuck in sympathetic activation when it should be handing over to the parasympathetic side.
Nervous System 03

The Sympathetic Nervous System

The part of your nervous system that turns you on — makes you alert, ready, activated.
What it is
The sympathetic nervous system (SNS) is responsible for the fight-or-flight response. Heart rate increases, breathing speeds up, muscles tense, senses sharpen, the body prepares to respond to a threat. It is the survival system.
Why it matters
The problem for modern humans is that the SNS activates in response to perceived threats — stress, anxiety, worry — not just physical ones. And once activated, it does not switch off immediately just because the threat has passed.
In SomaLofi scripts
'The sympathetic system does not hand over cleanly just because you got into bed' — it needs a specific counter-signal to begin standing down.
Nervous System 04

The Parasympathetic Nervous Systempar-a-sim-pa-thet-ik

The part of your nervous system that turns you off — rest, recovery, and repair mode.
What it is
The parasympathetic nervous system (PNS) is responsible for rest and digest. Heart rate slows, breathing deepens, muscles release, digestion resumes, the body enters recovery and repair. This is the state required for sleep, healing, and restoration.
Why it matters
The PNS is the destination. Every SomaLofi session is designed to shift the nervous system from sympathetic toward parasympathetic. Sleep only happens when the PNS is sufficiently dominant.
In SomaLofi scripts
'The rain is giving your nervous system consistent non-threatening input, which is how the parasympathetic system comes forward.' It is the biological goal of every session.
Nervous System 05

Dorsal Vagal Shutdown

An extreme protective state where the nervous system goes so quiet it feels like numbness or emotional flatness.
What it is
When the nervous system has been under sustained threat for too long, it can drop into a third state beyond fight-or-flight — a kind of freeze or collapse mediated by the dorsal branch of the vagus nerve. Emotional responses mute, energy drops, the person may feel numb or detached.
Why it matters
This explains the Flat Line — emotional numbness that is not depression but is the nervous system's protection mechanism. It is not permanent. It lifts when the nervous system receives enough sustained safety signals.
In SomaLofi scripts
'The nervous system pulled back to protect itself — like a circuit breaker tripping.' We frame dorsal vagal shutdown as protection, not malfunction.
Concept 06

Polyvagal Theorypol-ee-vay-gal

A framework by Dr Stephen Porges that explains three states the nervous system can be in, and how it moves between them.
What it is
Proposes that the autonomic nervous system has three states: social engagement (safe and connected), fight-or-flight (mobilised), and freeze/shutdown (collapsed). Safety signals — including sound, voice tone, and social connection — help the nervous system return to social engagement.
Why it matters
Provides the scientific foundation for why voice, music, and binaural sound work as nervous system tools. The prosodic quality of a calm voice activates the social engagement state.
In SomaLofi scripts
The theoretical foundation of much of what SomaLofi does. 'The voice and the sound are giving your nervous system a signal of safety' — polyvagal theory is the mechanism.
B
Section B

Brain regions

Specific parts of the brain that appear most frequently in SomaLofi scripts. Knowing what they do explains why certain states feel the way they do.

06 terms
Brain Region · Featured 07 · 36

The Amygdalaa-mig-da-la

The brain's alarm system — constantly scanning for threats and sounding the alert when it finds one.
What it is
An almond-shaped structure deep in the brain that processes emotional responses and threat detection. It works extremely fast — registering a potential threat before the conscious brain has even had time to evaluate it. When it detects threat (real or perceived), it triggers the sympathetic response.
Why it matters
It cannot distinguish between a physical threat and an emotional one, a real threat and an imagined one, or a present threat and a remembered one. This is why financial worry at 3AM produces the same physical response as encountering real danger.
In SomaLofi scripts
'Your amygdala does not distinguish between a financial threat and a physical one.' Understanding it removes the irrationality from anxiety.
threat detector
fires in milliseconds
Brain Region 08

The Prefrontal Cortexpree-frun-tal kor-tex

The rational, adult part of your brain — the part that provides context, proportion, and perspective.
What it is
Located at the front of the brain. Responsible for executive function: rational thinking, decision-making, planning, emotional regulation, impulse control. The part that says 'this is difficult but manageable' and 'this will pass'.
Why it matters
Acts as a counterbalance to the amygdala. When depleted — through poor sleep, stress, or 3AM neurochemistry — its ability to regulate the amygdala reduces significantly.
In SomaLofi scripts
The mechanism behind why 3AM thoughts feel catastrophic. 'The prefrontal cortex — the part that provides context and proportion — is running at lower capacity right now.'
Brain Region 09

The Anterior Cingulate Cortexan-teer-ee-or sin-gyu-late

The part of the brain that monitors for mistakes, conflicts, and unresolved items — and keeps flagging them until they are dealt with.
What it is
Sits between the rational prefrontal cortex and the emotional limbic system. One key function is conflict monitoring — detecting when something does not match expectations or when an item is unresolved. It keeps surfacing open items for attention.
Why it matters
Why a difficult conversation keeps coming back, especially at night. It also processes social pain — research shows social pain activates the ACC the same way as physical pain.
In SomaLofi scripts
'The anterior cingulate cortex is flagging the conversation as unresolved.' Also in invalidation sessions: 'the ACC registers each dismissal as a real loss.'
Brain Region 10

The Hippocampuship-oh-kam-pus

The brain's filing system — it consolidates experiences into memories and helps the brain decide what to keep and what to let go of.
What it is
A seahorse-shaped structure in the temporal lobe. Converts short-term experiences into long-term memories. During sleep — particularly REM — it works with the amygdala to process and integrate difficult emotional memories.
Why it matters
Sleep is not just rest but active processing. The brain uses sleep to integrate difficult emotional experiences. Unresolved relationships stay active because the hippocampus cannot encode a memory as complete if there is no resolution to encode.
In SomaLofi scripts
'Going back to sleep is not giving up — the hippocampus does its best work during sleep.'
Brain Region 11

The Default Mode Network

The part of the brain that activates when you are not focused on anything external — it turns inward and starts reviewing your life.
What it is
A network that activates when the brain is not focused on an external task. Responsible for mind-wandering, self-referential thinking, mental time travel (replaying the past, imagining the future), and processing social and emotional experiences.
Why it matters
The source of the 3AM spiral. When external demands go quiet, the DMN activates and starts processing the internal agenda. This is not malfunction — it is exactly what the DMN is designed to do.
In SomaLofi scripts
'Your brain has a mode it enters when external demands go quiet — the default mode network activates. It does not have an off switch.' Removes enormous shame from a racing mind at night.
Brain Region 12

The Locus Coeruleusloh-kus ser-oo-lee-us

A tiny structure in the brainstem that controls noradrenaline release — essentially the brain's alertness dial.
What it is
A small cluster of neurons in the brainstem — the primary source of noradrenaline in the brain. When active, the brain is alert and vigilant. When it quiets down, the brain can move toward sleep and rest.
Why it matters
Explains the wired-but-exhausted state. When the LC remains active past the point of usefulness, the brain stays alert even when the body is completely depleted. Consistent, predictable, safe sensory input signals that it can begin reducing noradrenaline output.
In SomaLofi scripts
'The locus coeruleus responds to consistent, predictable input by reducing noradrenaline output. The wave rhythm is that input.'
C
Section C

Hormones & neurochemicals

The chemicals that run your emotional and physiological states. Understanding these explains why the same situation feels completely different at 8PM versus 3AM.

05 terms
Hormone · Featured 13 · 36

Cortisolkor-ti-sol

The stress hormone — it wakes you up, primes you for action, and makes threats look bigger.
What it is
A steroid hormone produced by the adrenal glands. Regulates blood sugar, metabolism, inflammation, and the sleep-wake cycle. Follows a circadian rhythm: lowest in early sleep, rising around 3-4AM, peaking 30-45 minutes after waking.
Why it matters
The explanation for why 3AM feels worse. When cortisol is rising in the early morning hours, the threat detection system becomes more sensitive. The same thoughts that felt manageable at 8PM read as emergencies at 3AM. This is not irrational. It is chemistry.
In SomaLofi scripts
'Cortisol is naturally rising in the early morning hours — this is why the same thoughts feel heavier at 3AM.' 'Cortisol has a half-life of 60-90 minutes — it cannot be rushed.'
half-life · 60–90 min
rises at 3–4 AM
Hormone 14

Noradrenalinenor-a-dren-a-lin · norepinephrine

The alertness chemical — it keeps your brain awake, vigilant, and ready to respond.
What it is
Both a hormone and a neurotransmitter. Released by the locus coeruleus and the adrenal glands in response to stress, novelty, and perceived threat. Increases heart rate, blood pressure, and attention.
Why it matters
Elevated noradrenaline is the specific mechanism of the wired state in wired-but-exhausted. Responds to environmental safety cues — when the environment becomes consistently predictable, output begins to reduce.
In SomaLofi scripts
'Noradrenaline is keeping the brain one level above where it needs to be for sleep. The locus coeruleus will begin reducing its output when the environment signals safety.'
Hormone 15

Adrenalineepinephrine

The emergency hormone — instant energy and heightened alertness for a crisis.
What it is
Released by the adrenal glands in response to immediate threat. Works faster than cortisol and produces the immediate physical sensations of fight-or-flight: racing heart, rapid breathing, tunnel vision, surge of energy. Unlike cortisol, it clears relatively quickly.
Why it matters
The physical sensation of acute anxiety — racing heart, shallow breathing, physical urgency. Post-argument adrenaline is why it takes time to physically calm down even after a situation has resolved.
In SomaLofi scripts
'The adrenaline that ran during that experience does not switch off just because it is over. The body is still physically activated.'
Hormone 16

Melatoninmel-a-toh-nin

The sleep hormone — it tells your body it is dark and time to prepare for sleep.
What it is
Produced by the pineal gland in response to darkness. Does not cause sleep directly but signals that it is nighttime and sleep preparation should begin. Suppressed by light (especially blue light). Peaks around 2-3AM, declining in the early morning.
Why it matters
When disrupted by artificial light, late screen use, irregular sleep, or jet lag, the body's preparation for sleep is compromised. Explains why scrolling late at night makes sleep harder.
In SomaLofi scripts
'Blue light from screens suppresses melatonin production, signalling to the brain that it is still daytime.' Also in 3AM waking: 'melatonin has peaked and is declining, while cortisol is beginning to rise.'
Hormone 17

Oxytocinok-si-toh-sin

The connection hormone — released during genuine social bonding and the feeling of being seen and safe with another person.
What it is
Produced in the hypothalamus, released in response to social bonding, touch, genuine connection, and the experience of feeling safe with another person. Reduces cortisol and activates the parasympathetic system — genuine connection is literally calming at a biological level.
Why it matters
Explains structural loneliness. Presence without attunement — being surrounded by people who do not truly know you — does not produce oxytocin. The contact is there but the connection is not.
In SomaLofi scripts
'The oxytocin that comes from genuine attunement — from being truly known — is not released just because people are present. Contact without attunement keeps oxytocin low.'
D
Section D

Biological processes & systems

The larger biological mechanisms that govern how the brain and body respond to stress, threat, and the need for rest.

06 terms
System 18

The HPA Axis

The body's main stress system — the chain of command from brain to body that releases cortisol when you are under pressure.
What it is
Hypothalamic-Pituitary-Adrenal axis. The hypothalamus signals the pituitary, which signals the adrenals to release cortisol. This cascade takes seconds to minutes. Under sustained stress, it stays chronically activated and can become fatigued.
Why it matters
Explains chronic stress and burnout at a biological level. When running too hot — hypervigilance, anxiety. When too quiet — the Flat Line, numbing. This is not weakness. It is a system that has been overloaded.
In SomaLofi scripts
'The HPA axis has been running at a high level for too long. It down-regulates to protect itself.'
Process 19

The Cortisol Awakening Response

The natural cortisol spike that happens in the early morning hours to prepare your body and brain for the day.
What it is
Occurs approximately 30-45 minutes after waking. In healthy individuals, preceded by a gradual rise beginning around 3-4AM. In people under sustained stress, the rise can be steeper or earlier, tipping the brain into wakefulness before morning arrives.
Why it matters
The specific biological mechanism behind the 3AM waking pattern. Once awake, the elevated cortisol makes it harder to return to sleep because the threat detection system is already primed.
In SomaLofi scripts
'The cortisol that caused the waking also makes it harder to go back — the threat detection system is already primed.' Transforms 3AM waking from mysterious to understandable.
Process 20

The Orienting Response

The brain's automatic reaction to any new sound or movement in the environment — it instantly locates and evaluates the source.
What it is
Involuntary reflex that causes the brain to track any new sensory stimulus — particularly sound and movement. A survival mechanism: the brain needs to know immediately whether something is safe or threatening. Uses the same attentional resources as threat monitoring and rumination.
Why it matters
The mechanism behind why bilateral audio works. The brain cannot run the threat response and track a safe moving sound at full intensity simultaneously.
In SomaLofi scripts
The scientific mechanism behind the BAG Protocol. 'When a voice moves in real space between your ears, the orienting response activates. Each identification of safety softens the threat response.'
Process 21

Heart Rate VariabilityHRV

The variation in time between heartbeats — a measure of how well your nervous system can shift between states.
What it is
Despite what the name suggests, higher variability is better — it indicates a nervous system that can fluidly shift between activation and recovery. Low HRV is associated with chronic stress, poor sleep, anxiety. High HRV with recovery and resilience.
Why it matters
Why resonance breathing works. At 5-6 breaths per minute, the heart rate oscillates with the breath in a coherent pattern, optimising vagal tone and HRV. Sustained practice literally builds nervous system flexibility.
In SomaLofi scripts
'Slow breathing at 5-6 breaths per minute activates the heart-rate variability response and builds vagal tone over time.'
Process 22

Interoceptionin-ter-oh-sep-shun

The brain's awareness of what is happening inside the body — the sense that tells you your heart is racing or your stomach is tight.
What it is
Perception of the internal state of the body — heartbeat, breathing, hunger, temperature, tension, emotional physical sensations. The insular cortex is the primary brain region processing interoceptive signals.
Why it matters
Why body scan and somatic attention-shifting work. The interoceptive system is directly linked to parasympathetic activation. Attending to the body with curiosity — rather than judgment — is one of the most reliable pathways to nervous system regulation.
In SomaLofi scripts
'Into your chest — the physical experience of what has been happening today. Not explaining it, just noticing it.'
Concept 23

Neuroplasticitynyoo-roh-plas-tis-i-tee

The brain's ability to change and rewire itself based on experience and repeated practice.
What it is
The brain's capacity to form new neural connections and modify existing ones. Neurons that fire together wire together — patterns of thought and response that are repeated become increasingly automatic.
Why it matters
The mechanism of hope. Anxiety responses can be calmed, sleep patterns can be reshaped, and the nervous system can be trained toward greater flexibility with consistent practice.
In SomaLofi scripts
'With consistent counter-signal — through practice and through rest — the nervous system learns new patterns.'
E
Section E

Psychological concepts

The frameworks that underpin how SomaLofi understands and names the states people bring to our sessions.

06 terms
Concept 24

Ego Depletion

Willpower, decision-making, and self-control draw from a limited mental resource that gets used up across the day.
What it is
Developed primarily by Roy Baumeister. Proposes that self-regulation and mental effort draw from a limited cognitive resource. As the day progresses, the resource depletes. When low, decision quality decreases and even simple choices feel overwhelming.
Why it matters
Why the person who made high-quality decisions all morning finds themselves paralysed by what to have for dinner. The feeling of being unable to decide anything by evening is not laziness but biology.
In SomaLofi scripts
The foundation of The Empty Tank. 'Every decision you make uses the same cognitive resource. The Empty Tank is not a character flaw. It is a biological limit.'
Concept 25

Alexithymiaa-lex-i-thy-mee-a

Difficulty identifying and naming what you are feeling — the feelings are there, but you cannot quite locate or describe them.
What it is
Not the absence of emotion — the person still experiences emotional responses — but a difficulty in accessing, naming, and making sense of them. Mild alexithymia is common, especially in people who learned to suppress emotional expression.
Why it matters
Explains the Flat Line — 'something is there but I cannot quite reach it or name it.' Reduces the shame of not being able to explain what you are feeling.
In SomaLofi scripts
'The difficulty is not in feeling things but in accessing and naming the feeling. The signal is there. The readout is not working clearly.'
Concept 26

Hypervigilancehi-per-vij-i-lance

A state of being constantly on high alert — scanning the environment for threats even when there are none.
What it is
Heightened sensory sensitivity and continuous threat monitoring. Exhausting because it requires constant background processing. Often a response to an environment or history where threats were unpredictable.
Why it matters
Why people who feel safe intellectually still cannot relax physically. The nervous system runs a threat scan that does not respond to rational reassurance. It needs sustained environmental safety signals — not arguments.
In SomaLofi scripts
'Your nervous system moves into a state of low-level hypervigilance around those relationships. Every interaction becomes a potential site of the next dismissal.'
Concept 27

Cognitive Distortion

A systematic error in thinking — a way the brain consistently misreads situations in a particular direction.
What it is
Patterns of biased thinking: catastrophising, black-and-white thinking, mind-reading, magnification. Not stupidity or weakness — patterns the brain has learned, often as protective responses.
Why it matters
Significantly amplified at night and at 3AM. Reduced prefrontal capacity and elevated cortisol make the brain more likely to catastrophise and magnify. The 3AM reading is not the accurate reading.
In SomaLofi scripts
'The things the 3AM brain is most certain about are the things it is least accurate about.'
Concept 28

Narrative Closure

The brain's need for a story to have a clear ending before it can file it away and stop processing it.
What it is
Humans are story-making creatures. The brain processes experience as narrative and needs a clear conclusion to file an event as complete. When something ends without explanation, the brain keeps the file open.
Why it matters
Why ghosting is so psychologically damaging — no ending to process. Why the old wound at 3AM keeps returning — no resolution to encode. The brain needs the ending, and if it cannot find one, it keeps searching.
In SomaLofi scripts
'The brain keeps an open file on everything unresolved because there is no ending to encode. It keeps returning because it is genuinely looking for the ending.'
Concept 29

Social Baseline Theory

The human brain treats social connection as a fundamental resource — like food and water — not a nice-to-have.
What it is
Developed by James Coan. The brain assumes social connection as its baseline operating condition. The proximity of trusted others reduces the metabolic cost of managing threat. When trusted others are absent — or connection is superficial — the brain upregulates its threat response.
Why it matters
Why loneliness is not just unpleasant but physiologically taxing. Why the Invisible Wall — structural loneliness — produces such heaviness even when surrounded by people.
In SomaLofi scripts
'The brain is not just checking whether people are present. It is checking whether you are genuinely included — whether your actual experience is being met.'
F
Section F

Evidence-informed techniques

The specific techniques used across SomaLofi sessions. Each one has a documented mechanism and a reason it appears in the catalogue.

07 terms
Technique 30

Bilateral Stimulation

Alternating sensory input to the left and right sides of the brain — the core mechanism of EMDR and the BAG Protocol.
What it is
Alternating sensory input — visual, auditory, or tactile — between the left and right hemispheres. The foundational mechanism of EMDR. Theories suggest BLS works by occupying working memory (the same resource that maintains emotional intensity) and facilitating communication between hemispheres.
Why it matters
Reduces the vividness and emotional intensity of distressing material held in working memory. Does not eliminate the content — but reduces the emotional charge attached to it.
In SomaLofi scripts
The core mechanism of the BAG Protocol. 'When a voice moves between your ears in real 3D space, the orienting response activates. This occupies working memory — the same resource that is running the spiral.'
Technique 31

Cognitive Shuffle

A sleep technique that interrupts the narrative thought loop by introducing random, unconnected images — mimicking the brain's natural pre-sleep state.
What it is
Developed by sleep researcher Dr Luc Beaudoin. The brain's natural transition to sleep involves shifting from coherent narrative thought to loose, random imagery (hypnagogia). Introducing random images deliberately mimics this pre-sleep state.
Why it matters
The ruminating brain runs a narrative — a story with characters and a thread to follow. Random images cannot be built into a narrative. The narrative loses its grip.
In SomaLofi scripts
'The images that keep appearing in this session are not connected to each other. The brain looking for the thread of the worry will not find one. And for a moment, it stops looking.'
Technique 32

Somatic Attention Shifting

Deliberately moving awareness through different regions of the body to activate the body's own calming system.
What it is
Moving conscious attention sequentially through different parts of the body — not to fix what is found, but to notice and attend to it. Activates the interoceptive system and produces parasympathetic activation through a bottom-up pathway.
Why it matters
Attending to the body with curiosity — rather than judgment — signals safety to the nervous system. Redirects attention away from the ruminating mind and into present physical experience.
In SomaLofi scripts
'Into your chest. The particular tightness that has been sitting there. You do not have to clear it or explain it. Just let it be there while the rain holds the room.'
Technique · Featured 33 · 36

Extended Exhale Breathing

Making your exhale longer than your inhale — the single most reliable way to activate the vagus nerve and shift the nervous system toward calm.
What it is
Any breath pattern in which the exhale is longer than the inhale. 4-7-8, 2-4-6, 3-6 all use this principle. The extended exhale activates the vagus nerve more strongly because exhalation is associated with the parasympathetic phase of the cardiac cycle.
Why it matters
The most accessible and fastest-acting nervous system regulation technique available. Works within seconds. No equipment required. The physiological sigh — double inhale followed by long exhale — is the fastest single-breath anxiety relief technique known.
In SomaLofi scripts
'The longer you make the exhale, the stronger the parasympathetic signal.' The foundation of the breathwork series.
inhale 4 · exhale 8
vagus activation
Technique 34

Body Scan

A systematic practice of moving awareness through the body, region by region, noticing what is there without trying to change it.
What it is
One of the most researched practices in mindfulness. Popularised by Jon Kabat-Zinn as part of MBSR. Moving attention sequentially through the body, noticing sensations without judgment or intent to fix.
Why it matters
Works through multiple mechanisms: activates interoception, redirects attention from rumination, engages the parasympathetic system, and the acceptance-based approach reduces the secondary stress of fighting against how you feel.
In SomaLofi scripts
'Into your chest. Into your shoulders. Into your hands. Not to fix what is there. Just to notice it while something safe holds the room.'
Technique 35

Box Breathing4-4-4-4

Inhale for 4 counts, hold for 4, exhale for 4, hold for 4 — a regulation technique used by military and emergency services.
What it is
Equal intervals of inhale, hold, exhale, hold. Used by military, first responders, and athletes to regulate acute stress. The hold phases add to vagal activation and the equal structure creates a predictable, rhythmic pattern the nervous system can entrain to.
Why it matters
Provides a cognitive anchor (counting) that occupies the mind and prevents rumination, while simultaneously activating the parasympathetic system.
In SomaLofi scripts
'The counting occupies the ruminating brain. The breath does the physiological work.'
Technique 36

EMDReye movement desensitization & reprocessing

A clinical therapy that uses bilateral stimulation to reduce the emotional intensity of traumatic memories.
What it is
A structured psychotherapy developed by Francine Shapiro in the late 1980s. Uses bilateral stimulation while the client holds a distressing memory in mind. Reduces the emotional charge of the memory, allowing it to be processed without the full anxiety response. One of the most extensively validated trauma treatments available.
Why it matters
The clinical ancestor of the BAG Protocol. SomaLofi uses the mechanism (bilateral stimulation producing safety responses) applied to non-clinical contexts — sleep disruption, anxiety, regulation.
In SomaLofi scripts
'Bilateral stimulation is the foundational mechanism of EMDR, one of the most validated trauma therapies. SomaLofi uses the same mechanism through real 3D binaural sound.'
Section G

Quick reference

All 36 terms at a glance. Plain English only.

Term Plain English Category
Autonomic Nervous SystemThe part of your nervous system that runs automaticallyNervous System
Sympathetic Nervous SystemThe on switch — makes you alert and activatedNervous System
Parasympathetic Nervous SystemThe off switch — rest, recovery, and repairNervous System
Vagus NerveThe superhighway between brain and body for the rest responseNervous System
Dorsal Vagal ShutdownThe freeze state — nervous system goes quiet as extreme protectionNervous System
Polyvagal TheoryA framework explaining the three states of the nervous systemConcept
AmygdalaThe brain's alarm system — scans for threats constantlyBrain Region
Prefrontal CortexThe rational brain — context, proportion, and perspectiveBrain Region
Anterior Cingulate CortexFlags unresolved items and processes social painBrain Region
HippocampusThe brain's filing system — consolidates memories during sleepBrain Region
Default Mode NetworkActivates when you are not focused — turns inward and reviews your lifeBrain Region
Locus CoeruleusControls the alertness dial via noradrenaline releaseBrain Region
CortisolThe stress hormone — makes threats look bigger, rises at 3AMHormone
NoradrenalineThe alertness chemical — keeps the brain on high alertHormone
AdrenalineThe emergency hormone — instant activation for a crisisHormone
MelatoninThe sleep hormone — signals to the body that it is darkHormone
OxytocinThe connection hormone — released during genuine bondingHormone
HPA AxisThe brain-to-body chain of command for the stress responseSystem
Cortisol Awakening ResponseThe natural cortisol spike that begins at 3-4AMProcess
Orienting ResponseThe automatic reflex that locates any new sound in the environmentProcess
Heart Rate VariabilityA measure of how flexible the nervous system isProcess
InteroceptionThe brain's awareness of what is happening inside the bodyProcess
NeuroplasticityThe brain's ability to change and rewire with experienceConcept
Ego DepletionThe mental resource used for decisions gets used up across the dayConcept
AlexithymiaDifficulty identifying and naming what you are feelingConcept
HypervigilanceConstantly on high alert, scanning for threats even when safeConcept
Cognitive DistortionA systematic error in how the brain reads situationsConcept
Narrative ClosureThe brain's need for a clear ending before it can file something awayConcept
Social Baseline TheoryThe brain treats social connection as a fundamental resourceConcept
Bilateral StimulationAlternating sensory input left and right — the mechanism of EMDRTechnique
Cognitive ShuffleRandom images to interrupt the narrative thought loopTechnique
Somatic Attention ShiftingMoving awareness through the body to activate the calming systemTechnique
Extended Exhale BreathingMaking the exhale longer than the inhale to activate the vagus nerveTechnique
Body ScanMoving awareness through the body systematically without trying to fix anythingTechnique
Box Breathing (4-4-4-4)Equal inhale, hold, exhale, hold — rapid nervous system regulationTechnique
EMDRClinical therapy using bilateral stimulation — the ancestor of the BAG ProtocolTechnique
SomaLofi Science Glossary · v1
36 terms · 7 categories · April 2026
For educational purposes only. Not medical advice. Not a substitute for professional healthcare.
Important

SomaLofi is science-led and science-informed — not a clinical product. We do not claim to replace therapy, clinical care, or medical intervention, and we are not a diagnostic tool. The science we reference describes real biology; our features engage with that biology the way a thoughtful, evidence-informed wellness practice does — not the way a clinician does. If you are in crisis, please reach out to a licensed professional or a crisis line in your country.