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Human tonic immobility: measurement and correlates.

Murray P Abrams1, R Nicholas Carleton, Steven Taylor

  • 1Anxiety and Illness Behaviours Laboratory, University of Regina, Regina, Saskatchewan, Canada.

Depression and Anxiety
|January 27, 2009
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Summary
This summary is machine-generated.

Tonic immobility (TI), a fear response, is linked to trauma and dissociation. This study found TI may be an extreme expression of peritraumatic dissociation, impacting posttraumatic symptoms.

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Area of Science:

  • Psychology
  • Trauma Studies
  • Neuroscience

Background:

  • Tonic immobility (TI) is a temporary motor inhibition state linked to extreme fear, well-documented in animals but less studied in humans.
  • Human TI is theorized to occur during events like sexual assault and disasters, manifesting as fear-induced freezing.
  • Limited research exists on human TI, particularly its relationship with trauma and psychological outcomes.

Purpose of the Study:

  • To evaluate the factor structure of the Tonic Immobility Questionnaire (TIQ) for assessing human TI across various traumatic events.
  • To investigate associations between TIQ factors, posttraumatic symptoms, and trauma type.
  • To determine if TI correlates with predictors of posttraumatic stress disorder (PTSD).

Main Methods:

  • Utilized a self-report measure, the Tonic Immobility Questionnaire (TIQ), to assess TI.
  • Conducted exploratory factor analysis on TIQ responses from 78 undergraduate students who experienced TI during a traumatic event.
  • Examined correlations between TIQ factors, posttraumatic symptoms, dissociation, anxiety sensitivity, absorption, and PTSD predictors.

Main Results:

  • No significant differences in TI frequency or severity were found across different trauma types.
  • Factor analysis yielded a three-factor structure for the TIQ: physical immobility, fear, and dissociation.
  • TIQ scores positively correlated with posttraumatic symptoms, dissociation, anxiety sensitivity, and absorption. Peritraumatic dissociation explained 51% of TI variance.

Conclusions:

  • Tonic immobility may be an extreme behavioral manifestation of trauma-induced peritraumatic dissociation.
  • Findings suggest a strong link between TI and dissociation, highlighting its potential role in trauma responses.
  • Further research is needed to explore the implications of TI and its relationship with dissociation in trauma survivors.