Disgust motivates avoidance of stimuli associated with pathogens. Although disgust primarily inhibits oral and epidermal contact, it may also inhibit perceptual contact, particularly given the outsize role of sensory qualities in eliciting disgust. To examine perceptual avoidance of disgust, we presented images of bodily products or spoiled food paired with neutral images for 12-s trials and recorded eye movements (Experiment 1; N= 127). We found that overall, these disgusting images were not visually avoided compared to neutral images. However, viewing of disgusting images decreased with prolonged (within-trial) and repeated (between-trial) exposure, and these trends were predicted by self-reported disgust to the images. In Experiment 2 (N = 84), we replicated Experiment 1 with a novel set of disgusting images, as well as other unpleasant image categories (suicide, threat) and pleasant images. We found that disgusting stimuli were viewed less than the other unpleasant image categories, and we again found that viewing of disgusting images decreased with prolonged and repeated exposure. Further, we replicated the finding that disgust ratings predicted decreasing viewing of disgusting images, but only for prolonged exposure (within-trial). Unexpectedly, we found that disgust ratings predicted a similar pattern of decreasing viewing for the suicide and threat images as well. These findings suggest that disgust inhibits perceptual contact, but in competition with motivational processes that steer attention towards pathogen threats. We discuss the implications for measuring disgust with eye tracking.

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During human development, disgust is acquired to a broad range of stimuli, from rotting food to moral transgressions. Disgust’s expansion surely involves associative learning, yet little is known about Pavlovian disgust conditioning. The present study examined conditioned disgust responding as revealed by oculomotor avoidance, the tendency to look away from offensive stimuli. In two experiments, oculomotor avoidance was acquired to a neutral image associated with a disgusting image. However, to our surprise, participants initially dwelled on disgusting images, avoiding them only after multiple exposures. In Experiment 1, this “rubbernecking” response delayed oculomotor avoidance of the associated neutral image. In Experiment 2, we exhausted rubbernecking prior to conditioning by repeatedly exposing participants to the disgusting images. This procedure elicited earlier oculomotor avoidance of the associated neutral stimulus, essentially fast-forwarding conditioning. These findings reveal competing motivational tendencies elicited by disgust stimuli that complicate associative disgust learning.

No abstract

Disgust motivates avoidance of stimuli associated with pathogens. Although disgust primarily inhibits oral and epidermal contact, it may also inhibit perceptual contact, particularly given the outsize role of sensory qualities in eliciting disgust. To examine perceptual avoidance of disgust, we presented images of bodily products or spoiled food paired with neutral images for 12-s trials and recorded eye movements (Experiment 1; N= 127). We found that overall, these disgusting images were not visually avoided compared to neutral images. However, viewing of disgusting images decreased with prolonged (within-trial) and repeated (between-trial) exposure, and these trends were uniquely predicted by self-reported disgust to the images. In Experiment 2 (N = 84), we replicated Experiment 1 with a novel set of disgusting images, as well as other unpleasant image categories (suicide, threat) and pleasant images. We found that disgusting stimuli were viewed less than the other unpleasant image categories, and we again found that viewing of disgusting images decreased with prolonged and repeated exposure. Further, we replicated the finding that disgust ratings uniquely predicted decreasing viewing of disgusting images, but only for prolonged exposure (within-trial). Unexpectedly, we found that disgust ratings uniquely predicted a similar pattern of decreasing viewing for the suicide and threat images as well. These findings suggest that disgust inhibits perceptual contact, but in competition with motivational processes that steer attention towards pathogen threats. We discuss the implications for measuring disgust with eye tracking.