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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Tracking Flow in Real Time: Continuous Measurement of Game-Induced Flow in Virtual Reality.

Sura Genc1, Elif Surer2, Marc Wittmann3

  • 1Department of Psychology, University of Konstanz, Konstanz, Germany.

Psychophysiology
|April 8, 2026
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Summary
This summary is machine-generated.

Researchers developed a new real-time method to measure psychological flow using a foot pedal. This approach captures flow as it unfolds, correlating with physiological data and enhancing flow research.

Keywords:
flow experienceheart rate variabilityreal‐time measurementtime perception

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Area of Science:

  • Psychology
  • Human-Computer Interaction
  • Neuroscience

Background:

  • Flow experience is typically assessed post-task using questionnaires, limiting temporal resolution.
  • Existing methods fail to capture the dynamic, unfolding nature of flow states in real time.
  • There's a need for methods that allow continuous subjective flow measurement alongside psychophysiological data.

Purpose of the Study:

  • To introduce and validate a novel method for continuous, real-time subjective measurement of psychological flow.
  • To assess the impact of real-time flow reporting on the flow experience and psychophysiological measures.
  • To explore the relationship between real-time flow perception and heart-rate variability (HRV).

Main Methods:

  • Forty participants played a virtual reality game (Thumper) while reporting their flow experience using a custom foot pedal.
  • Electrocardiogram (ECG) signals were recorded to measure heart-rate variability (HRV).
  • Flow experience was assessed both in real-time via the pedal and post-task using the Flow Short Scale (FSS).

Main Results:

  • Using the foot pedal did not negatively impact participants' flow experience or HRV.
  • Real-time flow ratings from the pedal showed significant correlation with post-task FSS ratings, validating the method.
  • HRV analyses indicated associations between high-frequency HRV, LF/HF ratio, and perceived flow, suggesting autonomic nervous system involvement.

Conclusions:

  • The novel foot pedal method enables real-time, continuous assessment of flow experience.
  • This method allows for the analysis of the temporal dynamics of flow and its relationship with psychophysiological indicators.
  • Findings suggest that autonomic activity, particularly parasympathetic function and balance, may be linked to the subjective experience of flow.