Previous research suggests self-provided misinformation (lying) impairs memory for the truth, whereby more incorrect details are remembered compared to being truthful. The cognitive control processes evoked by inhibiting retrieval of truthful information may come at the expense of retaining that information in memory. Because lying requires quick adaptability to the situation, heart rate variability (HRV), reflecting cognitive control processes, is a useful metric of these cognitive demands. The present experiment extends previous research (Paige et al., 2019) and had participants complete a questionnaire orally in front of a panel while electrocardiography (ECG) data was collected. Participants were instructed to tell the truth for half of the questions and lie for the other half. For a subset of the questions, participants were instructed to elaborate on their response. After a delay, participants completed the same questionnaire on the computer, responding truthfully to all items. Results revealed that correct memory was lower for items participants previously lied about compared to truthful items. Although prior work suggests increased HRV is associated with increased cognitive control, HRV did not predict memory for truth or lie items. These findings are consistent with past literature showing that lying impairs memory for veridical information compared to truth-telling.
Keywords: Lying; cognitive control; heart rate variability; long term memory; memory.