Background: According to the dual-competition framework, inhibitory control is influenced by emotional arousal, with highly arousing stimuli potentially impairing response inhibition due to increased cognitive resource allocation toward stimulus processing. This study aimed to investigate how stimuli depicting fearful scenes affected inhibitory processing compared to non-fearful stimuli. Virtual reality (VR) was utilized to enhance emotional intensity, and two versions of the Go/No-Go task were employed: one with explicit processing of stimuli and another with masked stimuli requiring implicit processing.

Methods: Stimuli selection involved an image evaluation process, resulting in two task versions for the Go/No-Go paradigm. Sixty-four participants were randomly assigned to conditions involving exposure or no exposure to VR, combined with task version variations. Participants performed inhibitory tasks under these conditions to assess differences in inhibitory control influenced by stimulus type and processing method.

Results: Fear stimuli with higher arousal levels significantly impaired response inhibition compared to non-fearful stimuli. Explicit stimulus processing in the Go/No-Go task also showed greater inhibition impairment than implicit processing. Additionally, prior exposure to stimuli in VR conditions affected response times, indicating extended processing demands for inhibitory tasks.

Conclusions: This study confirmed that stimulus intensity, particularly emotional arousal, played a critical role in modulating inhibitory control. Fearful stimuli and explicit stimulus processing significantly reduced the ability to inhibit responses. Moreover, VR-induced stimulus exposure extended processing times, highlighting implications for understanding inhibitory processes under varying emotional and environmental conditions.