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title

Amygdala Hyperactivity

매 한 줄

"매 amygdala 의 exaggerated response 의 threat / emotional stimuli — 매 anxiety, PTSD, depression 의 transdiagnostic biomarker." 매 fMRI BOLD response 의 elevation (특히 face/threat tasks) — 매 prefrontal regulation 의 hypoactivity 와 pair — 매 2026 에 SSRI, CBT, TMS, psychedelic-assisted therapy 의 normalization target.

매 핵심

매 circuit

Amygdala: 매 basolateral (BLA, threat learning) + central (CeA, autonomic output).
vmPFC / dlPFC: 매 top-down inhibition — 매 hyperactivity 와 anti-correlation.
HPA axis: 매 amygdala → CRH → cortisol — 매 chronic activation 의 maladaptive.

매 conditions

Anxiety disorders: GAD, social anxiety, panic.
PTSD: 매 trauma-associated cue 의 sensitization.
MDD: 매 sad-face bias.
BPD: 매 emotional reactivity.
Autism: 매 mixed — face-processing 의 atypical activation.

매 응용

Diagnostic biomarker (research stage).
Treatment response prediction (SSRI, exposure therapy).
Neurofeedback / TMS target localization.

💻 패턴

fMRI BOLD extraction

from nilearn import image, masking, datasets

# Load Harvard-Oxford amygdala mask
atlas = datasets.fetch_atlas_harvard_oxford('sub-maxprob-thr25-2mm')
amyg_mask = image.math_img("img == 10", img=atlas.maps)  # left amyg label

# Extract task BOLD
bold = image.load_img("sub-01_task-faces_bold.nii.gz")
amyg_ts = masking.apply_mask(bold, amyg_mask).mean(axis=1)

Threat > neutral contrast

from nilearn.glm.first_level import FirstLevelModel

events = pd.DataFrame({
    "onset": [0, 20, 40, 60],
    "duration": [10]*4,
    "trial_type": ["threat", "neutral", "threat", "neutral"],
})

flm = FirstLevelModel(t_r=2.0, hrf_model="spm")
flm.fit(bold, events=events)
contrast = flm.compute_contrast("threat - neutral", output_type="z_score")

Functional connectivity (amyg-vmPFC)

from nilearn.connectome import ConnectivityMeasure

# Time series from amyg + vmPFC ROIs
ts = np.column_stack([amyg_ts, vmpfc_ts])
conn = ConnectivityMeasure(kind="correlation")
fc = conn.fit_transform([ts])[0]  # 2x2 corr matrix
amyg_vmpfc_fc = fc[0, 1]  # negative in healthy, weaker in anxiety

HRV proxy (peripheral readout)

import neurokit2 as nk

ecg = nk.ecg_clean(ecg_signal, sampling_rate=500)
peaks = nk.ecg_peaks(ecg, sampling_rate=500)[0]
hrv = nk.hrv_time(peaks, sampling_rate=500)
# Low RMSSD ↔ high sympathetic ↔ amyg overdrive

Real-time fMRI neurofeedback target

def neurofeedback_signal(current_volume, amyg_mask, baseline_mean, baseline_std):
    activation = masking.apply_mask(current_volume, amyg_mask).mean()
    z = (activation - baseline_mean) / baseline_std
    # Display inverted bar — patient learns to downregulate
    return -z

매 결정 기준

상황	Intervention
Acute anxiety	Benzodiazepine (short-term), breathing
Chronic anxiety	SSRI/SNRI + CBT
PTSD	Trauma-focused CBT, EMDR, prazosin (nightmares)
Treatment-resistant	TMS (dlPFC), ketamine, psilocybin trials
Research / monitoring	fMRI + HRV biomarkers

기본값: 매 CBT + SSRI — 매 6-12 weeks 의 expected normalization.

🔗 Graph

Adjacent: Autism-Spectrum-Disorder

🤖 LLM 활용

언제: 매 patient psychoeducation, 매 literature summarization. 언제 X: 매 diagnosis, 매 treatment prescription — 매 clinician 의 only.

❌ 안티패턴

Single-region focus: 매 amygdala alone — 매 circuit (vmPFC, hippocampus) 의 consideration.
State vs trait conflation: 매 task-induced state ≠ stable trait.
Reverse inference: 매 amyg activation = "fear" — 매 many functions.
fMRI as diagnostic: 매 group-level 의 individual 의 X.

🧪 검증 / 중복

Verified (Etkin & Wager 2007 meta-analysis, Shin & Liberzon 2010, Stein et al. 2007).
신뢰도 A.

🕓 Changelog

날짜	변경
2026-05-08	Phase 1
2026-05-10	Manual cleanup — circuit + biomarker patterns

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