Patterns of Interhemispheric Correlation During Human Communication
📄 Original study ↗📌 Appears in:
Plain English Summary
This pioneering 1987 experiment asked a wild question: when two people silently 'connect' mentally, do their brainwaves sync up? Pairs sat in a shielded room, eyes closed, with no way to physically communicate. Their brain activity was recorded and compared every quarter-second. When pairs intentionally tried to connect, their brainwave patterns became strikingly similar, jumping from zero correlation to about 0.80 -- a huge effect. Each pair developed its own unique synchronization pattern, ruling out simple explanations like fatigue. This foundational study introduced automated brain-correlation analysis and laid the groundwork for later 'transferred potential' experiments on brain-to-brain communication.
Actual Paper Abstract
Correlation patterns between the electroencephalographic activity of both hemispheres in adult subjects were obtained. The morphology of these patterns for one subject was compared with another subject's patterns during control situations without communication, and during sessions in which direct communication WAS stimulated. Neither verbalization nor visual or physical contact are necessary for direct communication to occur. The interhemispheric correlation patterns for each subject were observed to become similar during the communication sessions as compared to the control situations. These effects are not due to nonspecific factors such as habituation or fatigue. The results support the syntergik theory proposed by one of the authors (Grinberg-Zylberbaum).
Research Notes
Foundational paper introducing the interhemispheric correlation paradigm central to Grinberg-Zylberbaum's syntergic theory of neuronal field interactions. Demonstrates EEG-based brain-brain correlations without sensory contact, later extended in transferred potential experiments. Key methodological innovation: automated correlation analysis replacing manual coherence measurements from earlier work.
Pairs of subjects (13 pairs plus 4 triads) were seated in a Faraday cage, separated by 50cm with eyes closed and no sensory contact. EEG was recorded from frontal-occipital derivations (3-45 Hz) and interhemispheric correlations computed every 256ms using Pearson's r. An A-B-A design compared control isolation periods to communication periods where subjects intentionally connected. During direct communication, individual interhemispheric correlation patterns became highly similar (r≈0.80 vs. r≈0 in control), and intersubject EEG concordance increased significantly. Pattern convergence was pair-specific and not attributable to habituation or fatigue.
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📋 Cite this paper
Grinberg-Zylberbaum, Jacobo, Ramos, Julieta (1987). Patterns of Interhemispheric Correlation During Human Communication. International Journal of Neuroscience. https://doi.org/10.3109/00207458708985559
@article{grinberg_zylberbaum_1987_interhemispheric,
title = {Patterns of Interhemispheric Correlation During Human Communication},
author = {Grinberg-Zylberbaum, Jacobo and Ramos, Julieta},
year = {1987},
journal = {International Journal of Neuroscience},
doi = {10.3109/00207458708985559},
}