Abstract. Emotional stimuli automatically capture attention in ways that are relevant to the survival value of the stimuli. We have previously shown that individual differences in resting heart rate variability (HRV) were related to attentional capture by negative (fearful) and neutral distractors. However, different negative emotions such as fear and disgust may differentially capture attention. In the present study we investigated the effect of automatic attention capture by disgust and fear stimuli on behavioral and phasic heart rate responses as well as its relationship with resting heart rate variability (HRV). Twenty-eight participants (14 men) were divided into two groups based on their resting HRV. Phasic cardiac responses as well as reaction times and errors on a digit categorization task were assessed with disgust, fear, and neutral pictures as distractors. In the high HRV group disgusting distractors produced the strongest interference on the ongoing cognitive task indicated by more errors and longer reaction times as well as a deeper cardiac deceleration compared to fearful or neutral distractors. In contrast, the low HRV group showed faster reaction times to fear evoking pictures, whereas their heart rate responses and number of errors did not distinguish between the three emotional categories. Our results suggest that high HRV participants showed the emotional context appropriate responses while low HRV participants seem to be hypervigilant to fear.
Individual differences in resting heart rate variability and cognitive control in posttraumatic stress disorder
