Pupil Measurement Boundaries in Multimodal IRT

In eyeprocess: Harmonize Eye-Tracking, Pupillometry, Biometrics, and Psychometric Process Data

knitr::opts_chunk$set(collapse = TRUE, comment = "#>")
library(eyeprocess)

Why pupil needs a measurement layer

The 0.10 development simulator explicitly separates a neutral pupil responsivity dimension from nuisance effects of luminance and gaze position.

sim <- simulate_multimodal_irt(
  n_person=80, n_item=12, seed=21,
  pupil_luminance=-.25,
  gaze_x_effect=.10,
  gaze_y_effect=-.06
)
summary(sim$data[c("pupil_response","luminance_z","gaze_x_z","gaze_y_z")])

plot(sim, type="channel_distributions")

The presence of a pupil effect does not establish cognitive load, effort, or arousal.

eyeprocess documentation built on Sept. 28, 2026, 5:08 p.m.