When tonic cardiac vagal tone predicts changes in phasic vagal tone: The role of fear and perceptual load

Gewnhi Park, Michael W. Vasey, Jay J. Van Bavel, Julian F. Thayer

Research output: Contribution to journalArticlepeer-review

Abstract

We examined the relationship between tonic-a correlate of self-regulatory functioning-and phasic cardiac vagal activity (indexed by heart rate variability; HRV) during a selective attentional task with varying levels of load. Participants detected a target letter among letter strings superimposed on either fearful or neutral face distractors. Letter strings consisted of six target letters under low load and one target letter and five nontarget letters under high load. With fearful distractors, lower tonic HRV was associated with phasic HRV suppression, suggesting an autonomic stress response under both low and high load. In contrast, higher tonic HRV was associated with phasic HRV enhancement, suggesting greater self-regulatory effort under low load and an absence of phasic HRV suppression under high load. The current research suggests that tonic cardiac vagal tone is associated with the ability to flexibly adapt autonomic responses.

Original languageEnglish (US)
Pages (from-to)419-426
Number of pages8
JournalPsychophysiology
Volume51
Issue number5
DOIs
StatePublished - May 2014

Keywords

  • Cardiac vagal tone
  • Self-regulatory effort

ASJC Scopus subject areas

  • Neuroscience(all)
  • Neuropsychology and Physiological Psychology
  • Experimental and Cognitive Psychology
  • Neurology
  • Endocrine and Autonomic Systems
  • Developmental Neuroscience
  • Cognitive Neuroscience
  • Biological Psychiatry

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