Entangled in the Womb? A Pilot Study on the Possible Physiological Connectedness Between Identical Twins
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Plain English Summary
Can identical twins feel each other's pain — literally? This pilot study tested four twin pairs. One twin sat isolated with sensors tracking skin response, blood pressure, and breathing, while their sibling was startled at random with crashing plates, ice buckets, and electric shocks. Lie-detector experts then tried to match the isolated twin's body reactions to startle moments — completely blind to timing. Overall, results were a wash. But one rare twin type stole the show. These "mo-mo" twins shared the same placenta and fluid sac in the womb — something only 1-2% of identical twins experience. A blind expert correctly pinpointed 3 of 5 startle times for this pair, confirmed by a second independent expert, both statistically significant. They also reported the strongest daily feelings of connectedness. Tiny sample, so no grand conclusions, but the possibility that the closest womb-mates share a mysterious physiological link is genuinely intriguing.
Research Notes
Published in Explore (Elsevier), Vol. 8, No. 6, pp. 339-347. Study funded and logistically supported by Danish national television (DR1); authors from Copenhagen University (Jensen, Neurobiology Research Unit) and University of Gothenburg (Parker). Methodological innovations include atomic clock synchronization across camera shots, randomized stimulus schedules, and hypergeometric statistics. The mo-mo embryonic variable (shared placenta + amnionic sac) is novel — only 1-2% of identical twins are mo-mo. Followed up by Parker (2013).
Pilot study testing physiological connectedness between identical twins using randomized startle stimuli, predefined objective hit criteria, and blind assessment by professional polygraph experts. Four pairs of monozygotic twins participated; one pair excluded for technical error. While one twin received 5 randomized startle stimuli (plates crashing, ice bucket, electric shock, lemon juice, jack-in-the-box) during a 12-minute period, the isolated twin's GSR, blood pressure, breathing, and movement were recorded. Overall results were nonsignificant (P > .7). However, for the monochorionic-monoamnionic (mo-mo) pair — twins who shared one placenta and one amnionic sac — a blind polygraph expert identified 3 of 5 stimulus times from 10 estimates (P = .03), confirmed independently by a second blind expert (P = .013). The mo-mo pair reported the most connectedness experiences and had the closest embryonic development.
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📋 Cite this paper
Jensen, C. G, Parker, A (2012). Entangled in the Womb? A Pilot Study on the Possible Physiological Connectedness Between Identical Twins. Explore: The Journal of Science and Healing. https://doi.org/10.1016/j.explore.2012.08.001
@article{jensen_2012_entangled,
title = {Entangled in the Womb? A Pilot Study on the Possible Physiological Connectedness Between Identical Twins},
author = {Jensen, C. G and Parker, A},
year = {2012},
journal = {Explore: The Journal of Science and Healing},
doi = {10.1016/j.explore.2012.08.001},
}