Randomized Controlled Trial Testing Mobile-Based Attention-Bias Modification for Posttraumatic Stress Using...

Area of Science:

• Psychiatry
• Psychology
• Digital Health

Background:

• Behavioral therapies are effective for posttraumatic stress disorder (PTSD), but patient access is limited.
• Attention-bias modification (ABM) is a cognitive intervention that can be delivered via technology to reduce threat bias.
• Mobile health interventions offer a potential solution for increasing access to PTSD treatments.

Purpose of the Study:

• To investigate the effectiveness of a mobile app delivering personalized and nonpersonalized attention-bias modification (ABM) for posttraumatic stress disorder (PTSD).
• To assess the impact of mobile ABM on PTSD symptoms, anxiety, depression, and attention bias.
• To examine the potential mechanisms of change, including attention bias and threat sensitivity.

Main Methods:

• A large-scale, remote trial involving 689 participants randomly assigned to personalized ABM, nonpersonalized ABM, or placebo training.
• ABM was delivered daily for 12 sessions using a modified dot-probe paradigm on a mobile app.
• Primary outcomes (PTSD, anxiety) and secondary outcomes (depression, PTSD clusters) were measured at baseline, post-training, and 5-week follow-up.

Main Results:

• No significant group differences were observed in primary or secondary outcomes, including PTSD and anxiety symptoms, or in attention bias.
• Nonpersonalized ABM demonstrated a statistically significant greater reduction in self-reported threat sensitivity compared to the placebo group (p = .044).
• This study represents the largest mobile-based trial of ABM for PTSD to date.

Conclusions:

• The findings do not support the effectiveness of mobile attention-bias modification (ABM) as a standalone treatment for posttraumatic stress disorder (PTSD).
• While a slight reduction in threat sensitivity was noted with nonpersonalized ABM, it did not translate to broader clinical improvements.
• Further research may be needed to optimize digital interventions for PTSD, potentially exploring different cognitive mechanisms or delivery formats.