Generate M2 alignment negative controls

Generates deterministic within-item permutations that preserve each item's marginal channel distribution while breaking person-level alignment for gaze, RT, or response. These are falsification controls, not causal interventions and not misconduct detectors.

Usage

multimodal_m2_negative_controls(x, seed = 20260814L)

Arguments

x

M2-compatible data.

seed

Seed for deterministic permutations.

Value

An `eye_multimodal_m2_negative_controls`.