An interventional study of occasional aversive imagination and Exposure in Spider Fear and Arachnophobia, sponsored by Philipps University Marburg. Completed at 1 site in Germany. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-01-09.
Sponsored by Philipps University Marburg · Not applicable, Interventional, and Treatment
The effectiveness of an optimized extinction training is investigated in spider-fearful individuals. Participants will undergo a one-session standardized extinction training, either with or without occasional metal imagination of most feared apprehension towards spiders. The effectiveness of the training is measured by symptom improvement according to subjective ratings and behavioural avoidance tests one week later.
The present study aims to investigate the applicability of an optimized exposure training using imagination. Exposure training is an effective approach to the treatment of various anxiety disorders. However, there are a significant number of patients who do not benefit or who develop anxiety following successful treatment. The process of extinction underlying exposure is the focus of current research on optimizing exposure. In this regard, one promising approach for improving extinction learning involves the occasional presentation of fear-generating stimuli (unconditioned stimuli [US]; often an electrical stimulus in experimental studies) during extinction (occasional reinforced extinction, ORE). Previous experimental studies provide preliminary evidence for a less pronounced return of fear after extinction training with occasional presentation of the US. In clinical practice, this strategy is recommended to optimize extinction learning in the treatment of individuals with anxiety. However, the transfer of the procedure used (real presentation of an unconditioned stimulus) into clinical practice seems difficult to realize. One way to facilitate the transfer of the ORE approach into clinical practice could be the use of vivid imagination of a personally relevant fear-generating situation during extinction training/exposure (e.g., patients' central concerns). Therefore, the aim of the present study is to examine the applicability of ORE using imagination. In this context, a standardized extinction training either with or without mental imagination of a personally relevant fear situation (e.g., central concern of the consequences when confronted with spiders) will be performed in individuals with spider-fearful individuals. The approach used for individuals with spider fear is well established and has been successfully implemented in previous studies by instructed trainers (e.g., individuals with a bachelor's degree in psychology). The aim of this randomized controlled trial in healthy individuals with increased fear of spiders is to investigate whether optimized extinction training (extinction training + imagination) is more effective in reducing fear of spiders in the long term compared to standard extinction training.
Exclusion Criteria:
repeated imaginations of the participants' most feared apprehension during extinction training with seven standardized exposure steps
Behavioral: occasional aversive imagination · Behavioral: Exposure
Standard extinction training with seven standardized exposure steps
Behavioral: Exposure
During six of the 27 exposure trials, participants in the experimental group are asked to imagine their most feared outcome towards spiders as vividly as possible while completing the specific trial.
• All participants complete an exposure training session (approx. 75 min) with seven exposure steps, which are repeated between one and five times (e.g. Step 4: directing the spider with a pen by touching its legs at least five times per repetition; this step must be repeated five times before continuing to the next step). One repetition per step is considered one trial, therefore each participant aims to complete 27 exposure trials.
Spider Phobia Questionnaire (SPQ)
31-item true/false questionnaire assessing symptoms of arachnophobia. Scores range from 0 to 31, with greater scores representing greater fear of spiders. Spider phobic individuals have obtained mean scores of 23.20 (SD = 2.90) and 23.76 (SD = 3.80) on the SPQ.
Time frame: Change from baseline to post-treatment (i.e., 7-9 days)
Behavioral Approach Test (BAT)
Number of test steps fully completed (0-14 steps)
Time frame: Change from baseline to post-treatment (i.e., 7-9 days)
Fear rating
Maximum fear rating on a scale from 0 (no fear) to 100 (severe fear) recorded once during BAT
Time frame: Change from baseline to post-treatment (i.e., 7-9 days)
Fear of Spider Questionnaire (FSQ)
14-item questionnaire on a 7-point Likert scale (0 = 'I don't agree at all'; 6 = 'I completely agree') assessing symptoms of arachnophobia. Total score range: 0 to 84. Higher scores indicate worse severity of arachnophobia.
Time frame: Change from baseline to post-treatment (i.e., 7-9 days)
Change in anxiety sensitivity (ASI-3)
The Anxiety Sensitivity Index (ASI-3) is a self-report measure of fear of anxiety-related body symptoms (i.e., anxiety sensitivity). Total score range: 0 to 72. Higher scores indicate worse anxiety sensitivity.
Time frame: change from baseline to post-treatment (i.e. 7-9 days)
PROMIS Emotional Distress-Anxiety-Short Form
The DSM-5-TR Level 2-Anxiety-Adult measure is the 7-item PROMIS Anxiety Short Form that assesses the pure domain of anxiety in individuals age 18 and older. Each item on the measure is rated on a 5-point scale (1=never; 2=rarely; 3=sometimes; 4=often; and 5=always) with a range in score from 7 to 35 with higher scores indicating greater severity of anxiety.
Time frame: change from baseline to post-treatment (i.e. 7-9 days)
US expectancy and fear ratings
Ratings of US expectancy and fear during exposure training on a scale from 0 (I don't expect my feared outcome/I am not scared at this moment) to 100 (I completely expect my feared outcome to happen/I am severely scared at this moment). Specifically, we asked participants to rate their US expectancy and fear before and during each of the 27 trials.
Time frame: Baseline
This study is completed, as verified in Jan 2026. You cannot join it, but the record below documents what was studied.
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Arachnophobia
Philipps University Marburg