Impulsivity as a multifactorial construct and its relationship to PTSD severity and threat sensitivity

Area of Science:

• Psychology
• Neuroscience
• Psychiatry

Background:

• The DSM-5 emphasizes arousal dysregulation in posttraumatic stress disorder (PTSD).
• The link between PTSD and threat sensitivity is established, but its connection to impulsivity is less understood.
• Impulsivity may play a role in PTSD-related arousal dysregulation.

Purpose of the Study:

• To investigate the relationship between PTSD symptom severity, threat sensitivity, and impulsivity.
• To explore the distinct roles of cognitive and behavioral impulsivity in PTSD.
• To examine the association between impulsivity, threat sensitivity, and psychophysiological responses.

Main Methods:

• 124 participants completed the PTSD Checklist (PCL-C) and Barratt Impulsiveness Scale (BIS-11).
• BIS-11 subdomains (cognitive and behavioral impulsivity) were analyzed.
• A subsample (n=39) underwent a threat-enhanced acoustic startle paradigm measuring psychophysiological responses under varying threat conditions.

Main Results:

• PTSD severity correlated significantly with higher overall and behavioral impulsivity.
• Overall impulsivity, cognitive impulsivity, and behavioral impulsivity were associated with psychophysiological responses across threat conditions in trauma-exposed individuals.
• Findings suggest PTSD severity is linked to behavioral impulsivity, while both impulsivity types relate to threat sensitivity and hyperarousal.

Conclusions:

• Assessing impulsivity, especially its cognitive and behavioral facets, is clinically relevant for PTSD.
• Impulsivity may be a key factor in understanding arousal dysregulation and threat sensitivity in PTSD.
• Further research into impulsivity's role in PTSD is warranted.