Rather than assume mind-to-mind transmission, start with observable synchrony: aligned heart rates, similar language choices, simultaneous ideas. These could be emergent properties of shared context or something more.
One person focuses on a simple symbol (circle, triangle, wave) for five minutes while another draws what comes to mind. Repeat 20 trials; log hits.
Two people wear heart-rate sensors. Sit back-to-back breathing together for 10 minutes. Track whether variability synchronizes beyond chance.
Work silently in the same room, then compare ideas or solutions produced. Note overlaps and whether mood matched.
Results could reflect probabilistic overlap, subconscious mimicry, or something non-local. The goal is not proof but careful observation with enough rigor to learn.