Novel Human Fear Conditioning Paradigm Developed to Test Reconsolidation-Blocking Interventions

Current research into anxiety disorders and fear memory often faces challenges with floor effects in human fear conditioning paradigms, where interventions appear 100% effective, hindering the ability to compare novel treatments. This limitation prevents accurate assessment of the relative strengths of different pharmacological and behavioral interventions. Understanding and modulating fear reconsolidation, a memory process where reactivated fear memories become labile and susceptible to modification, offers a promising therapeutic avenue. However, a robust and sensitive human model is needed to effectively test compounds that block this process, such as propranolol.

This pilot study aims to develop a sensitive human fear conditioning paradigm to test novel interventions. Subjects will undergo a four-day fear conditioning and delayed extinction protocol. The design incorporates a highly prepared conditioned stimulus (CS) using video of spiders, and focuses on sensitive subjects identified by stronger acquired conditioned responses (CRs). The primary endpoint for paradigm validation is the ability to observe significant, but only partial, CR reduction from established techniques like propranolol and delayed extinction. Skin conductance response data will be gathered across different experimental phases to quantify fear responses.

The pilot study aims to establish a human fear conditioning paradigm designed to overcome floor effects often seen in anxiety research, where interventions appear 100% effective. Investigators hypothesize that by employing a highly prepared conditioned stimulus (spider videos) and selecting sensitive subjects with strong acquired conditioned responses (CRs), the paradigm will allow for the observation of significant, but only partial, CR reduction from established techniques like propranolol and delayed extinction. This partial reduction is crucial to create a testing ground for novel reconsolidation-blocking or memory-updating interventions, ensuring there is room to test and compare their relative strengths without hitting a ceiling effect. The paradigm's success would be defined by its ability to reliably demonstrate these partial effects, thereby providing a more nuanced platform for future pharmacological and behavioral intervention studies.