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Task-evoked pulse wave amplitude tracks cognitive load.

Yuri G Pavlov1, Anastasia S Gashkova2, Dauren Kasanov2

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Pulse wave amplitude (PWA) effectively tracks cognitive load and overload, outperforming heart rate (HR). This non-invasive measure, derived from photoplethysmography (PPG), shows significant potential for practical applications in assessing mental effort.

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Area of Science:

  • Psychophysiology
  • Cognitive Neuroscience
  • Human-Computer Interaction

Background:

  • Cognitive load significantly impacts performance in demanding tasks.
  • Accurate measurement of cognitive load is essential across research and practical settings.
  • Existing measures like heart rate (HR) may lack sensitivity to nuanced cognitive states.

Purpose of the Study:

  • To evaluate pulse wave amplitude (PWA) as a sensitive indicator of cognitive load and mental effort.
  • To compare the efficacy of PWA against heart rate (HR) in tracking cognitive load during a memory task.
  • To explore the relationship between PWA, HR, pupil dilation, and behavioral performance.

Main Methods:

  • Participants (N=78) performed a digit span task with varying memory loads (5, 9, 13 digits) and a control task.
  • Pulse wave amplitude (PWA) was measured using photoplethysmography (PPG).
  • Heart rate (HR) via electrocardiography (ECG), and pupil dilation were recorded concurrently.

Main Results:

  • PWA demonstrated significant suppression with increasing memory load, indicating sensitivity to cognitive load.
  • Heart rate (HR) showed no significant changes with task difficulty.
  • Cognitive overload resulted in a reversal of the PWA pattern, correlating with pupil dilation dynamics.

Conclusions:

  • Pulse wave amplitude (PWA) is a more sensitive psychophysiological measure for cognitive load and overload than heart rate (HR).
  • PWA, measured non-invasively via PPG, offers practical potential for assessing cognitive load in diverse applications.
  • Findings enhance understanding of cognitive load indicators and support PWA's utility in monitoring mental effort.