Quadratic trend analysis and heartbeat detection

  • Wiens S
  • Palmer S
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In heartbeat detection tasks based on the Method of Constant Stimuli (MCS), subjects judge the simultaneity between their heartbeats and stimuli presented at six intervals ranging from 0 to 500 ms after the R-waves on an electrocardiogram. Because research suggests that subjects do not perceive stimuli at 0 or 500 ms as simultaneous, individual performance was indexed with quadratic trend analysis to test for distributions of simultaneity judgments across intervals that peak between 0 and 500 ms. Further, because some tasks use only two intervals, performance was also indexed using intervals of either 0 and 200 ms or 200 and 500 ms. Continuous performance scores from quadratic trend and two-interval analysis tended to correlate more highly with variables previously shown to correlate with heartbeat detection than scores from the commonly-used χ2analysis. These findings support the use of both quadratic trend analysis and two-interval tasks for assessing heartbeat detection ability. Copyright © 2001 Elsevier Science B.V.

Author-supplied keywords

  • Cardiac perception
  • Electrocardiography
  • Heartbeat detection
  • Interoception
  • Method of constant stimuli

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