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Latah: an Indonesian startle syndrome
Mirte J Bakker1, J Gert van Dijk, Astuti Pramono
1Department of Neurology and Clinical Neurophysiology, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands.
Summary
Culture-specific startle syndromes like Latah involve exaggerated startle responses. This study classified Latah as a neuropsychiatric startle syndrome based on increased motor startle reflexes and behavioral responses.
Area of Science:
- Neurology
- Cultural Psychiatry
- Neurophysiology
Background:
- Culture-specific startle syndromes, such as Latah found in Indonesia and Malaysia, remain poorly understood.
- Existing hypotheses suggest origins in sociocultural behavior, psychiatric disorders, or neurological syndromes.
- These syndromes present with exaggerated startle responses, involuntary vocalizations, echolalia, and echopraxia across diverse populations.
Purpose of the Study:
- To investigate the nature of Latah by quantifying startle reflexes.
- To differentiate Latah within broader categories of startle syndromes: hyperekplexia, startle-induced disorders, and neuropsychiatric startle syndromes.
- To support the classification of Latah through objective physiological and behavioral measures.
Main Methods:
- Studied 12 female Latah patients and 12 matched controls using structured history taking and neurological examination.
- Provoked vocalizations, echolalia, and echopraxia to assess behavioral responses.
- Quantified auditory startle reflexes via electromyography of 6 muscles following 104-dB tones, analyzing short (<120 ms) and long (100–1000 ms) latency phases.
Main Results:
- Both early (<120 ms) and late (100–1000 ms) motor startle responses were significantly increased in Latah patients compared to controls (P ≤ .05).
- Latah patients exhibited stereotyped vocalizations and echo phenomena following their startle response.
- While startle responses were objectively increased, the significant clinical findings were the stereotyped behavioral responses post-startle.
Conclusions:
- The study supports classifying Latah as a neuropsychiatric startle syndrome.
- Increased motor startle reflexes, coupled with characteristic behavioral responses, define Latah's place within this classification.
- Objective quantification of startle reflexes aids in understanding and categorizing these unique culture-specific syndromes.
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