The effectiveness of an optimized group exposure treatment is investigated in spider-fearful individuals. Participants will undergo an optimized standardized exposure treatment. After receiving information about the treatment and the phobic stimulus (spider) through a psychoeducation video, participants will observe an exposure treatment of another fearful person, either live or by watching a movie of an exposure treatment online. Subsequently, participants will undergo a live in vivo exposure treatment conducted in a group setting. The effectiveness of the treatment is measured by symptom improvement according to online behavioral avoidance tests and subjective ratings immediately after training and one week later.
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Spider Phobia Questionnaire (SPQ)
Timeframe: Change from baseline to immediately post treatment 1 (after modeled exposure), immediately post treatment 2 (group exposure) and follow-up (7 days after group exposure - post treatment 2)
Change in avoidance behavior (online virtual Behavioral Approach Task, vBATon)
Timeframe: Change from baseline to immediately post treatment 1 (after modeled exposure), immediately post treatment 2 (group exposure) and follow-up (7 days after group exposure - post treatment 2)
Change in spider fear: Spider Anxiety Questionnaire (FSQ/SAF)
Timeframe: Change from baseline to immediately post treatment 1 (after modeled exposure), immediately post treatment 2 (group exposure) and follow-up (7 days after group exposure - post treatment 2)