Generate M3 multimodal falsification controls

Includes within-item RT/gaze/pupil permutations, within-person pupil permutation across items, pupil phase randomization, luminance-only pseudo-pupil, and an irrelevant synthetic channel. Controls preserve selected marginals while deliberately breaking alignment; they are not causal interventions or misconduct detectors.

Usage

multimodal_m3_negative_controls(x, seed = 20260815L)

Arguments

x

M3-compatible data.

seed

Deterministic seed.

Value

An `eye_multimodal_m3_negative_controls`.