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Related Concept Videos

Case Studies01:22

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There are many research methods available to psychologists in their efforts to understand, describe, and explain behavior and the cognitive and biological processes that underlie it.
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Related Experiment Video

Updated: May 15, 2026

Model Surgical Training: Skills Acquisition in Fetoscopic Laser Photocoagulation of Monochorionic Diamniotic Twin Placenta Using Realistic Simulators
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Further possible physiological connectedness between identical twins: the London study.

Adrian Parker1, Christian Jensen

  • 1Department of Psychology, University of Gothenburg, Gothenburg, Sweden. Adrian.Parker@psy.gu.se

Explore (New York, N.Y.)
|January 9, 2013
PubMed
Summary

This study explored physiological synchrony in identical twins (monozygotic twins). Findings suggest potential for shared physiological responses between twins during specific stimuli, warranting further investigation.

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Area of Science:

  • Psychophysiology
  • Twin Studies
  • Neuroscience

Background:

  • Investigating physiological synchrony in monozygotic twins.
  • Exploring potential for shared responses to external stimuli.

Purpose of the Study:

  • To test for synchronous physiological responses in one twin when the other is exposed to shock and surprise stimuli.
  • To assess the validity of a methodology for detecting such responses.

Main Methods:

  • Four pairs of monozygotic twins participated in 25-minute sessions.
  • Stimuli (shock, surprise) were presented randomly across eight trial periods within blocks.
  • Physiological data were analyzed by a polygraph expert to identify stimulus-response correlations.

Main Results:

  • Six correct stimulus placements (hits) were identified out of 24 trial blocks.
  • This exceeded chance expectation (three hits).
  • One pair of twins accounted for four of the six correct placements.

Conclusions:

  • The findings provide preliminary support for synchronous physiological responses between monozygotic twins.
  • The methodology shows promise for future, larger-scale twin studies.
  • Further research is justified to explore the mechanisms of this observed synchrony.