Measure Cognitive Effort Using Gazepoint HD Tracker: IDs

To measure cognitive effort using a Gazepoint HD tracker, the most commonly used indicators are:

  1. Pupil Dilation: Changes in pupil size can be indicative of cognitive load. When a task becomes more demanding, the pupil often dilates. The relevant IDs for this would be:

    • LPMW and LPMH: Left pupil diameter in millimeters and pixels.
    • RPMW and RPMH: Right pupil diameter in millimeters and pixels.

  2. Blink Rate and Duration: Changes in blinking behavior can also provide insights into cognitive effort. For instance, an increase in blink rate may indicate increased cognitive load.

    • BKID: A unique numeric identifier assigned to each blink.
    • BKDUR: The duration of the preceding blink in seconds.
    • BKPMIN: The number of blinks in the previous 60-second period of time.

  3. Fixation Duration: Longer fixations can sometimes indicate cognitive processing or difficulty.

    • POGD: The duration of the fixation POG in seconds.

  4. Heart Rate and Variability: An increase in heart rate and variability can be associated with increased cognitive effort.

    • HR: The heart rate value in beats per minute.
    • HRV: The heart rate value flag.
    • IBI: The heart rate interbeat interval, time between heart beats (seconds).

  5. Galvanic Skin Response (GSR): An increase in GSR can indicate heightened cognitive or emotional arousal.

    • GSR: The galvanic skin response value.

It's important to note that while these measures can provide insights into cognitive effort, they are influenced by multiple factors. It's essential to account for potential confounds and interpret the data in the context of the specific task and experimental design. If possible, combining multiple measures can provide a more robust indicator of cognitive effort.

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