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Processing angry and neutral faces in post-traumatic stress disorder: an event-related potentials study
Kim L Felmingham1, Richard A Bryant, Evian Gordon
1School of Psychology, University of New South Wales, Sydney, NSW 2052, Australia.
Neuroreport
|April 15, 2003
Summary
Individuals with post-traumatic stress disorder (PTSD) show altered brain responses to angry faces. Unlike controls, PTSD patients exhibited reduced early and late negative evoked response potentials (ERPs) to emotional stimuli.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Post-traumatic stress disorder (PTSD) is associated with altered threat perception.
- Evoked response potentials (ERPs) offer insights into rapid neural processing of emotional stimuli.
Purpose of the Study:
- To investigate differences in ERPs to angry versus neutral faces in individuals with PTSD compared to controls.
- To explore the neural mechanisms underlying threat processing in PTSD.
Main Methods:
- ERP recordings were taken from temporal (T5, T6) and occipital (O1, O2) regions in 15 individuals with PTSD and 15 matched controls.
- Participants viewed alternating angry and neutral facial expressions.
Main Results:
- Controls showed significantly larger early negative (N110) and late negative (N650) ERP components to angry faces compared to neutral faces.
- The PTSD group did not exhibit differential ERP responses between angry and neutral faces.
- Reduced amplitude of negative ERP waveforms was observed in the PTSD group relative to controls.
Conclusions:
- Findings suggest that controls exhibit adaptive threat detection, while individuals with PTSD may have a diminished ability to differentiate between threat and non-threat stimuli.
- Altered ERPs in PTSD may reflect a generalized response to threat rather than specific threat discrimination.