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Neural processes during response inhibition in complex posttraumatic stress disorder
Richard A Bryant1,2, Jenny Tran1,2, Thomas Williamson1,2
1School of Psychology, University of New South Wales, Sydney, New South Wales, Australia.
Depression and Anxiety
|December 29, 2021
Summary
Complex posttraumatic stress disorder (CPTSD) shows reduced thalamic activation during inhibition tasks, distinguishing it from PTSD. This suggests impaired neural processes in CPTSD related to response inhibition.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Impulsivity is a key feature of complex posttraumatic stress disorder (CPTSD), impacting daily functioning.
- The underlying neural mechanisms of impulsivity in CPTSD remain poorly understood.
- Identifying these mechanisms is crucial for understanding and treating CPTSD.
Purpose of the Study:
- To investigate the distinct neural profile of CPTSD during inhibitory control tasks.
- To compare brain activity in CPTSD, PTSD, and healthy controls during response inhibition.
- To identify specific neurobiological markers differentiating CPTSD from PTSD.
Main Methods:
- Functional magnetic resonance imaging (fMRI) and electroencephalogram (EEG) were used.
- Participants (CPTSD, PTSD, controls) performed a Go/NoGo response inhibition task.
- Brain activation during NoGo trials was analyzed to assess inhibitory control functioning.
Main Results:
- CPTSD participants exhibited reduced bilateral thalamic activation compared to PTSD and control groups during inhibition.
- No significant differences in thalamic activation were found between PTSD and control groups.
- Functional connectivity and EEG responses did not differ significantly between the groups.
Conclusions:
- Findings suggest aberrant thalamic functioning in the neurocircuitry of inhibitory control in CPTSD.
- This thalamic dysfunction may represent a neural marker distinguishing CPTSD from PTSD.
- Impaired neural processes in response inhibition are implicated in CPTSD.
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