Problematic Internet Use: The Relationship Between Resting Heart Rate Variability and Emotional Modulation of Inhibitory Control.

A growing literature suggests that problematic Internet use (PIU) is associated with defective inhibitory control. In this study, we sought to investigate the ability to inhibit prepotent motor responses in an emotional context in individuals with PIU, and to examine the relationship between inhibitory control and resting heart rate variability (HRV), which is regarded as a measure of self-regulation and adaptability. Problematic users (PU, n = 20) and nonproblematic users (non-PU, n = 20) completed an emotional Go/NoGo task, involving the presentation of unpleasant, pleasant, and neutral pictures. The electrocardiogram was recorded at rest for a 3-minute period. PU showed lower resting HRV, relative to non-PU. Although reaction times (RTs) to Go task stimuli were not faster in PU, relative to non-PU, accuracy rates were significantly lower among PU, irrespective of pictures' emotional content. Only among PU did lower resting HRV predict lower response accuracy in pleasant and unpleasant Go trials and less efficient task performance (combining RTs to Go trials and accuracy to NoGo trials) upon presentation of unpleasant stimuli. Our findings suggest that reduced HRV is a potential indicator of defective inhibitory control in an emotional context in PIU.