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Schemas

Schemas

A schema is a mental construct consisting of a cluster or collection of related concepts (Bartlett, 1932). There are many different types of schemata, and they all have one thing in common: schemata are a method of organizing information that allows the brain to work more efficiently. When a schema is activated, the brain makes immediate assumptions about the person or object being observed.

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Related Experiment Video

Updated: Feb 3, 2026

3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache

3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache

Published on: June 2, 2014

Thunderclap headache: an update.

Chih-Wen Yang^1,2, Jong-Ling Fuh^2,3

¹a Department of Neurology , National Yang-Ming University Hospital , Ilan , Taiwan.

Expert Review of Neurotherapeutics

|October 19, 2018

Summary

This summary is machine-generated.

Thunderclap headache (TCH) requires urgent evaluation for serious causes like subarachnoid hemorrhage (SAH). Reversible cerebral vasoconstriction syndrome (RCVS) is an increasingly recognized cause of TCH.

Keywords:

Thunderclap headache reversible cerebral vasoconstriction syndrome subarachnoid hemorrhage

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Last Updated: Feb 3, 2026

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Published on: February 19, 2021

Area of Science:

Neurology
Emergency Medicine
Radiology

Background:

Thunderclap headache (TCH) is a severe, rapidly peaking headache.
Subarachnoid hemorrhage (SAH) is a critical, life-threatening cause of TCH.
Prompt diagnosis and management are crucial for TCH patients.

Purpose of the Study:

To review current research on TCH clinical features.
To update the diagnostic evaluation of TCH.
To present the diverse etiologies of TCH.

Main Methods:

Review of PubMed-listed research articles.
Analysis of clinical features, diagnostic pathways, and causes of TCH.
Expert commentary on recent findings.

Main Results:

TCH etiologies include SAH, reversible cerebral vasoconstriction syndrome (RCVS), cervical artery dissection, and others.
RCVS is a more frequently diagnosed cause of TCH in the last decade.
Brain CT is the initial diagnostic test, followed by lumbar puncture if CT is negative.

Conclusions:

Urgent evaluation of TCH is essential to rule out SAH.
Brain CT and lumbar puncture are key initial diagnostic steps.
Further imaging like MRI and vascular studies are needed for non-SAH causes.