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Habituation and Prepulse Inhibition of Acoustic Startle in Rodents
08:38

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Published on: September 1, 2011

Startle syndromes.

Roongroj Bhidayasiri1, Daniel D Truong

  • 1Chulalongkorn Comprehensive Movement Disorders Center, Chulalongkorn University Hospital, Bangkok, Thailand.

Handbook of Clinical Neurology
|April 19, 2011
PubMed
Summary
This summary is machine-generated.

Startle responses are involuntary muscle twitches to sudden stimuli. Abnormal startle syndromes include hyperekplexia, startle epilepsy, and hyperstartling, each with distinct causes and presentations.

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Area of Science:

  • Neuroscience
  • Neurology
  • Genetics

Background:

  • Startle is a rapid, involuntary muscle contraction to unexpected stimuli.
  • Abnormal startle responses are categorized into three main groups: hyperekplexia, startle epilepsy, and hyperstartling.
  • These syndromes present with varying triggers, severity, and associated conditions.

Purpose of the Study:

  • To provide an overview of normal and abnormal startle responses.
  • To discuss the clinical presentation, physiology, and neuronal basis of startle syndromes.
  • To offer diagnostic hints and distinguishing features for differentiating these disorders.

Main Methods:

  • Literature review and synthesis of existing research on startle syndromes.
  • Analysis of clinical presentations, genetic factors, and neurological associations.
  • Comparison of diagnostic criteria and distinguishing features.

Main Results:

  • Hyperekplexia involves generalized startle due to genetic factors like GLRA1 mutations.
  • Startle epilepsy is linked to brain damage, often from perinatal hypoxia.
  • Hyperstartling, seen in specific populations (e.g., Latah), involves non-habituating responses to stimuli.

Conclusions:

  • Startle syndromes are heterogeneous neurological conditions requiring careful diagnosis.
  • Understanding the underlying mechanisms is crucial for effective management.
  • Further research may elucidate the specific neuronal basis and genetic links in all forms of abnormal startle.