Brain Glossary

Every structure in the atlas — what it is, what it does, and how it shows up in performance. 20 entries, sorted A–Z.

Amygdala

Limbic System/uh-MIG-duh-luh/

Definition: The alarm system. It scans for threat and fires before you can think.
What it does: Amygdala hijack narrows attention, accelerates heart rate, and pulls resources away from the prefrontal cortex. Trainable through exposure and reappraisal.
Clinical note: Almond-shaped nuclei in the medial temporal lobe. Basolateral nucleus evaluates salience; central nucleus drives autonomic and endocrine output via the hypothalamus and brainstem.

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Anterior Cingulate Cortex

Cortex/an-TEER-ee-or SING-you-late KOR-teks/

Definition: The effort and error detector — it notices conflict and says 'try harder'.
What it does: Willingness to keep pushing when it hurts correlates with ACC engagement. It is the anatomy of grit.
Clinical note: Medial frontal cortex supporting conflict monitoring, error-related negativity, pain affect and effort allocation.

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Basal Ganglia

Subcortical/BAY-sul GANG-lee-uh/

Definition: Where habits and automatic skills live.
What it does: Moving a skill from PFC-controlled to basal-ganglia-automatic is the entire point of technical training.
Clinical note: Striatum, globus pallidus, subthalamic nucleus and substantia nigra forming cortico-striatal loops for action selection, habit formation and reinforcement learning.

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Brain Stem

Brain Stem/BRAYN stem/

Definition: Keeps you alive — breathing, heart rate, alertness.
What it does: Breathing is the one autonomic output you can consciously drive — the fastest lever on your whole nervous system.
Clinical note: Midbrain, pons and medulla. Houses cardiorespiratory nuclei, cranial nerve nuclei, locus coeruleus and raphe nuclei.

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Cerebellum

Subcortical/sair-uh-BELL-um/

Definition: The coordination engine — smooth, timed, accurate movement.
What it does: Automaticity in flow is largely cerebellar. It also contributes to timing in cognition and emotional regulation.
Clinical note: Contains over half the brain's neurons. Builds internal forward models comparing intended and actual movement, correcting error in real time.

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Default Mode Network

Large-Scale Network/dee-FAULT mode NET-work/

Definition: The self-referential daydreaming network — active when you're not on task.
What it does: DMN quieting is one of the most consistent neural markers of flow. Self-consciousness literally has a network.
Clinical note: Medial prefrontal cortex, posterior cingulate/precuneus and angular gyrus; supports self-referential processing, autobiographical memory and mind-wandering.

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Hippocampus

Limbic System/hip-oh-KAM-pus/

Definition: Turns experience into memory, and gives memory its context.
What it does: Context binding is why a skill learned in practice may not transfer to competition — encode in the environment you'll perform in.
Clinical note: Medial temporal structure essential for encoding and consolidation of declarative memory and spatial navigation. Site of adult neurogenesis; sensitive to chronic glucocorticoid exposure.

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Hypothalamus

Subcortical/hy-po-THAL-uh-mus/

Definition: The thermostat — hunger, temperature, sleep, and the stress cascade.
What it does: Sets the physiological baseline you compete from: hydration, thermoregulation, sleep pressure, and cortisol rhythm.
Clinical note: Master homeostatic regulator; initiates the HPA axis via CRH release and controls autonomic outflow and pituitary hormone secretion.

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Insula

Limbic System/IN-soo-luh/

Definition: Reads the body from the inside — your gut feeling has an address.
What it does: Interoceptive accuracy predicts emotional regulation and pacing. Athletes with better body-reading make better in-race decisions.
Clinical note: Insular cortex, the primary interoceptive hub; anterior insula supports subjective feeling states, effort perception and salience detection.

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Motor Cortex

Cortex/MOH-ter KOR-teks/

Definition: Sends the final 'go' signal that moves your body.
What it does: Skill acquisition physically reshapes the motor map. Repetition with intent expands cortical representation of the trained movement.
Clinical note: Primary motor cortex (M1) in the precentral gyrus. Somatotopically organized; Betz cells project via the corticospinal tract to spinal motor neurons.

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Occipital Lobe

Cortex/ok-SIP-it-al lobe/

Definition: Vision headquarters — turns light into a usable picture of the world.
What it does: Under high arousal, peripheral vision narrows. Deliberately widening gaze lowers arousal via the optic-brainstem link.
Clinical note: Primary visual cortex (V1) and extrastriate areas processing orientation, motion, depth and object features.

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Orbitofrontal Cortex

Cortex/or-bit-oh-FRON-tal KOR-teks/

Definition: Assigns value — is this worth it, and how do I feel about the outcome?
What it does: Drives risk appraisal and reward learning. Poor OFC updating shows up as repeating a tactic that has stopped working.
Clinical note: Ventral frontal cortex integrating sensory and limbic input to compute subjective value and update reward expectations.

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Parietal Lobe

Cortex/puh-RY-uh-tal lobe/

Definition: Where your body meets space — touch, position, and spatial awareness.
What it does: Body-in-space accuracy underpins spatial awareness and feel.
Clinical note: Somatosensory cortex plus posterior parietal association areas integrating proprioception and visuospatial attention.

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Prefrontal Cortex

Cortex/pree-FRON-tal KOR-teks/

Definition: The brain's control tower. It plans, decides, holds your attention, and keeps impulses in check.
What it does: Executive bandwidth is finite. Under pressure, cortisol and norepinephrine flood the PFC and narrow working memory — the neural signature of overthinking. Elite performance often means using the PFC to prepare, then quieting it to execute.
Clinical note: Anterior frontal association cortex encompassing dorsolateral, ventromedial and frontopolar subdivisions. Supports executive function, working memory, cognitive flexibility, inhibition and top-down regulation of limbic structures.

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Premotor Cortex

Cortex/pree-MOH-ter KOR-teks/

Definition: Plans and sequences a movement just before you make it.
What it does: This is where anticipation lives — preparing the response before the stimulus arrives shaves tens of milliseconds off reaction time.
Clinical note: Lateral premotor and supplementary motor areas; encode movement preparation, sequencing and externally cued action selection.

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Reticular Activating System

Brain Stem/reh-TIK-you-lar AK-tiv-ay-ting SIS-tem/

Definition: The dimmer switch for alertness and wakefulness.
What it does: Sets your global arousal level — the y-axis of the Yerkes-Dodson curve.
Clinical note: Diffuse brainstem network projecting to thalamus and cortex; regulates arousal, sleep-wake transitions and attentional gating.

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Reward Circuit

Large-Scale Network/ree-WARD SIR-kit/

Definition: The wanting machine — dopamine, motivation, and pursuit.
What it does: Dopamine tracks the gap between expected and actual reward. Chasing outcomes deflates it; valuing effort protects it.
Clinical note: Mesolimbic pathway from ventral tegmental area to nucleus accumbens with prefrontal projections; encodes reward prediction error.

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Salience Network

Large-Scale Network/SAY-lee-ence NET-work/

Definition: The switchboard that decides what deserves your attention right now.
What it does: Fast, accurate switching between relaxed and locked-in is a trainable skill governed here.
Clinical note: Anterior insula and dorsal anterior cingulate; detects salient stimuli and toggles between default mode and executive control networks.

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Temporal Lobe

Cortex/TEM-por-al lobe/

Definition: Hearing, language understanding, and long-term memory storage.
What it does: Processes coaching cues, crowd noise, and stored tactical knowledge.
Clinical note: Houses primary auditory cortex, Wernicke's area, and medial temporal memory structures; supports semantic knowledge and object recognition.

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Thalamus

Subcortical/THAL-uh-mus/

Definition: The relay station — nearly all sensory traffic routes through it.
What it does: Sensory gating determines what reaches awareness — the basis of attention under noise.
Clinical note: Paired nuclei relaying sensory and motor signals to cortex; gates arousal and attention in concert with the reticular activating system.

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