# Felt — Atlas of Embodied Emotion > Interactive 3D human muscle atlas in Three.js mapping where emotions are experienced and regulated across 23 sculpted muscle groups and 10 whole-body PNAS topographical emotion heatmaps (Nummenmaa et al., 2014; Volynets et al., 2020). Felt pairs an interactive 360-degree Three.js anatomical figure with peer-reviewed interoceptive neuroscience, autonomic nerve pathways, somatic polarity scores (+t activation warmth vs -t deactivation heaviness), and evidence-based physiological down-regulation protocols. ## Documentation & Agent Discovery - [Live 3D Atlas](https://h3manth.com/fun/felt/): Interactive Three.js web application with URL state (`?region=` or `?emotion=`). - [Full Embodied Neuroscience Reference](https://h3manth.com/fun/felt/llms-full.txt): Complete 23-muscle neurobiology, nerve tracts, reset protocols, and DOIs. - [A2A Agent Card](https://h3manth.com/fun/felt/agent-card.json): Machine-readable WebMCP tool schemas and endpoints. ## WebMCP & Browser Agent API (`navigator.modelContext` / `window.feltAtlas`) - `select_muscle_group({ muscleId, focusZoom })`: Select any of the 23 muscle groups, orient/zoom the 3D camera, and return its full somatic and neurobiological profile. - `set_emotion_heatmap({ emotionId })`: Activate whole-body PNAS topographical heatmap mode for one of 10 emotions across all 23 muscle groups. - `list_muscle_groups({ system })`: List all 23 muscle groups, optionally filtered by anatomical system. - `query_embodied_science({ query })`: Search across nerves, muscles, sensations, emotions, and physiological mechanisms. ## 23 Granular Muscle Groups (URL Deep Links) - [Brow & Temporalis](https://h3manth.com/fun/felt/?region=brow_temples) (`brow_temples` · Head & Neck, Corrugator Supercilii, Frontalis & Temporalis): Grief brow furrowing, threat appraisal & ruminative tension. - [Cheeks, Eyes & Malar Flush](https://h3manth.com/fun/felt/?region=face_cheeks) (`face_cheeks` · Head & Neck, Zygomaticus Major, Orbicularis Oculi & Malar Vascular Bed): Shame blushing, Duchenne joy & tearful autonomic expression. - [Jaw & Masseter](https://h3manth.com/fun/felt/?region=jaw_masseter) (`jaw_masseter` · Head & Neck, Masseter, Medial Pterygoid & Temporomandibular Joint): Suppressed anger, unspoken restraint & stress bruxism. - [Throat & SCM Neck](https://h3manth.com/fun/felt/?region=throat_scm) (`throat_scm` · Head & Neck, Sternocleidomastoid, Scalenes & Pharyngeal Larynx): Uncried grief ("globus" lump), vocal tremor & accessory breathing. - [Upper Trapezius & Collarbone](https://h3manth.com/fun/felt/?region=upper_traps) (`upper_traps` · Shoulders & Chest, Descending Upper Trapezius, Levator Scapulae & Clavicle): Mental workload, startle shielding & chronic hypervigilance. - [Deltoid Shoulder Caps](https://h3manth.com/fun/felt/?region=deltoids) (`deltoids` · Shoulders & Chest, Anterior, Acromial (Lateral) & Posterior Deltoid Heads): Defensive armoring, postural agency & confrontational readiness. - [Pectoralis & Heart Wall](https://h3manth.com/fun/felt/?region=pectorals) (`pectorals` · Shoulders & Chest, Pectoralis Major (Clavicular & Sternocostal) & Cardiac Plexus): Love, grief ("heartache"), pride expansion & acute panic. - [Serratus & Intercostal Ribs](https://h3manth.com/fun/felt/?region=serratus_ribs) (`serratus_ribs` · Shoulders & Chest, Serratus Anterior Digitations & External/Internal Intercostals): Anxious ribcage squeeze, breath-holding & reaching drive. - [Diaphragm & Solar Plexus](https://h3manth.com/fun/felt/?region=diaphragm_solar) (`diaphragm_solar` · Core & Gut, Thoracic Diaphragm, Costal Arch & Celiac Autonomic Plexus): Startle breath-arrest, anticipatory dread & vagal pacing. - [Rectus Abdominis & Visceral Gut](https://h3manth.com/fun/felt/?region=rectus_abs) (`rectus_abs` · Core & Gut, Rectus Abdominis (6-Pack Bellies), Linea Alba & Enteric Plexus): Visceral disgust, "gut feelings" & enteric-vagal signaling. - [External Obliques & Flanks](https://h3manth.com/fun/felt/?region=obliques) (`obliques` · Core & Gut, External & Internal Abdominal Obliques & Iliac Crest): Lateral visceral corseting, defensive recoil & torsional bracing. - [Mid-Traps & Scapular Cuff](https://h3manth.com/fun/felt/?region=mid_back_scapula) (`mid_back_scapula` · Back & Spine, Middle/Lower Trapezius, Rhomboids, Infraspinatus & Teres Major): Grief collapse, restrained embrace & interscapular ache. - [Latissimus Dorsi Wings](https://h3manth.com/fun/felt/?region=lats) (`lats` · Back & Spine, Latissimus Dorsi (Thoracolumbar-to-Humeral V-Taper)): Expansive pride V-posture, trunk stabilization & pulling power. - [Lumbar Spine & Erector Spinae](https://h3manth.com/fun/felt/?region=lumbar_erectors) (`lumbar_erectors` · Back & Spine, Longissimus, Iliocostalis, Multifidus & Thoracolumbar Fascia): Psychosocial stress loading, burnout & unsupported threat bracing. - [Pelvis & Iliopsoas Hip Flexors](https://h3manth.com/fun/felt/?region=hip_flexors_pelvis) (`hip_flexors_pelvis` · Pelvis & Glutes, Iliopsoas, Tensor Fasciae Latae (TFL) & Pelvic Bowl): Survival startle-curl (psoas), trauma guarding & passionate vitality. - [Gluteus Maximus & Medius](https://h3manth.com/fun/felt/?region=glutes) (`glutes` · Pelvis & Glutes, Gluteus Maximus, Gluteus Medius & Sacral Aponeurosis): Grounded standing power, propulsive drive & fearful tail-tucking. - [Biceps & Triceps (Upper Arm)](https://h3manth.com/fun/felt/?region=upper_arms) (`upper_arms` · Arms & Hands, Biceps Brachii (Short/Long), Brachialis & Triceps Horseshoe): Pulling embrace vs. pushing defense & depressive limb heaviness. - [Forearm Flexors & Extensors](https://h3manth.com/fun/felt/?region=forearms) (`forearms` · Arms & Hands, Brachioradialis, Pronator Teres & Carpi Flexor/Extensor Bellies): Grip tension, restrained frustration & vigilant wrist bracing. - [Hands, Palms & Fingers](https://h3manth.com/fun/felt/?region=hands) (`hands` · Arms & Hands, Thenar & Hypothenar Eminences, Lumbricals & Palmar Microvasculature): Fist-clenching rage, "cold clammy" fear sweat & tender connection. - [Quadriceps, Sartorius & Adductors](https://h3manth.com/fun/felt/?region=quads_adductors) (`quads_adductors` · Legs & Feet, Rectus Femoris, Vastus Lateralis, VMO, Sartorius & Adductor Group): Sprint readiness, shock "weak knees" & inner-thigh guarding. - [Posterior Thigh Hamstrings](https://h3manth.com/fun/felt/?region=hamstrings) (`hamstrings` · Legs & Feet, Biceps Femoris, Semitendinosus & Semimembranosus): Protective crouch-freeze, restrained flight & vigilant tension. - [Calves, Shins & Achilles](https://h3manth.com/fun/felt/?region=calves_shins) (`calves_shins` · Legs & Feet, Gastrocnemius, Soleus ("Second Heart"), Tibialis Anterior & Achilles): Postural sway freezing, restless leg tapping & venous return. - [Feet, Arches & Toes](https://h3manth.com/fun/felt/?region=feet) (`feet` · Legs & Feet, Plantar Intrinsic Muscles, Extensor Brevis & Cutaneous Mechanoreceptors): "Cold feet" vasoconstriction, toe-gripping anxiety & grounded presence. ## 10 PNAS Whole-Body Emotion Heatmaps (URL Deep Links) - [Anxiety](https://h3manth.com/fun/felt/?emotion=anxiety) (`anxiety`): Cardiorespiratory, diaphragmatic & jaw/trapezius bracing with cold extremities — Concentrates intense sympathetic activation in the pectorals, serratus ribs, solar plexus, rectus gut, throat SCM, masseter, and upper trapezius, paired with distal vasoconstriction in the feet. - [Anger](https://h3manth.com/fun/felt/?emotion=anger) (`anger`): Explosive jaw, brow, chest & upper-limb mobilization (fists + forearms + biceps) — Redirects cardiac output directly into the jaw masseters, brow, pectorals, deltoids, biceps/triceps, forearms, and clenched fists to prepare for confrontation. - [Love](https://h3manth.com/fun/felt/?emotion=love) (`love`): Radiant pectoral-heart, cheek, visceral & pelvic warmth with embracing arms — Produces warm vagal-oxytocinergic activation spanning the cheeks, pectorals, solar plexus, abdomen, anterior pelvis, and embracing upper arms and hands. - [Happiness](https://h3manth.com/fun/felt/?emotion=happiness) (`happiness`): Whole-body expansive vitality from Duchenne cheeks & chest to feet — The only human emotion showing broad positive somatic activation across virtually all 23 muscle groups—reflecting uninhibited motor readiness and cardiorespiratory ease. - [Sadness](https://h3manth.com/fun/felt/?emotion=sadness) (`sadness`): Pectoral heartache, throat "globus" & grief brow paired with limb deactivation — Combines focal distress activation in the pectorals, throat SCM/larynx, and corrugator grief brow with pronounced motor withdrawal across the arms, hands, thighs, calves, and feet. - [Depression](https://h3manth.com/fun/felt/?emotion=depression) (`depression`): Global peripheral & postural motor deactivation ("leaden paralysis") — Marked by near-zero positive warmth and pervasive sensory/motor attenuation across upper and lower limb musculature, glutes, back, and pelvis. - [Fear](https://h3manth.com/fun/felt/?emotion=fear) (`fear`): Chest/diaphragm surge, psoas & quad sprint priming, clammy hands & cold feet — Mobilizes heart, diaphragm, psoas hip flexors, and quadriceps for survival escape while constricting cutaneous blood flow in the feet ("cold feet"). - [Disgust](https://h3manth.com/fun/felt/?emotion=disgust) (`disgust`): Throat gag-guarding, nasal-cheek wrinkle & rectus-enteric gut rejection — Selectively illuminates the digestive-protective axis: nasal-cheek levators, pharyngeal throat, diaphragm, and rectus abdominis gut center. - [Shame](https://h3manth.com/fun/felt/?emotion=shame) (`shame`): Intense malar cheek & ear blushing paired with slumped limb withdrawal — Features the classic "blushing mask" across the cheeks, ears, and brow alongside inward shoulder collapse and peripheral cooling. - [Pride](https://h3manth.com/fun/felt/?emotion=pride) (`pride`): Pectoral lift, wide deltoid-latissimus V-posture & upright crown — Concentrates expansive upward activation in the pectorals, deltoids, latissimus dorsi wings, mid-back stabilizers, and uplifted head.