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Related Concept Videos

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DefinitionTraumatic brain injury, or TBI, is a disturbance of normal brain function induced by an external mechanical force, such as a direct blow to the head or a penetrating injury. It can affect both brain structure and function, producing a wide range of clinical outcomes. TBI is a heterogeneous condition, meaning its effects may differ based on the type, location, and severity of the injury.Basis of ClassificationTBI is classified based on severity, injury mechanism, or pathophysiology. In...
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Spinal cord injury progresses through two interconnected phases: primary injury and secondary injury.Primary InjuryPrimary injury happens at the moment of trauma and involves immediate mechanical damage to the spinal cord.Compression happens when broken vertebrae, herniated discs, or accumulating blood (such as a hematoma) press directly against the spinal cord, distorting its normal shape and function. In cases of contusion, the cord is bruised by a blunt force (like penetrating injuries or...
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Trauma and the default mode network: review and exploratory study.

Aldrich Chan1,2,3, Philip Harvey2, Rene Hernandez-Cardenache2

  • 1Center for Neuropsychology and Consciousness, Miami, FL, United States.

Frontiers in Behavioral Neuroscience
|January 7, 2025
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Summary

Trauma exposure, even outside PTSD diagnosis, impairs default mode network (DMN) functions like self-reflection and social cognition. Brain structure remained intact, suggesting cognitive changes are functionally mediated, not structural.

Keywords:
PTSDdefault mode networkneuropsychologynon-trauma-exposedresiliencereviewtraumatrauma-exposed

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Area of Science:

  • Neuroscience
  • Psychology
  • Trauma Studies

Background:

  • Post-traumatic stress disorder (PTSD) research often overlooks the broader spectrum of trauma responses.
  • The default mode network (DMN) is implicated in various cognitive functions affected by trauma.

Purpose of the Study:

  • To explore the neuropsychological functioning of the DMN in individuals with trauma exposure but without a PTSD diagnosis.
  • To investigate the relationship between DMN function, cognitive performance, and brain structure in trauma-exposed individuals.

Main Methods:

  • Literature review on DMN and trauma responses.
  • Systematic exploratory study with 27 participants (16 trauma-exposed, 11 controls).
  • Neuroimaging and neuropsychological assessments of DMN functioning.

Main Results:

  • Trauma-exposed individuals showed reduced self-referential processing, social cognition, autobiographical recall, and prospection.
  • Increased mind-wandering was observed in the trauma-exposed group compared to controls.
  • No significant volumetric differences were found between groups, despite cognitive deficits.

Conclusions:

  • Cognitive impairments related to DMN function in trauma-exposed individuals appear functionally mediated.
  • Preserved DMN structural integrity may be a marker of resilience.
  • Reduced hippocampal volume might be a vulnerability factor for PTSD, rather than solely a consequence.