This document summarizes Guillaume Dumas' presentation on inter-brain synchronization research. Some key points include: - Research on inter-brain synchronization using EEG and MEG hyperscanning has grown significantly since the 2000s as a way to study human social cognition and interaction. - Studies have found synchronized neural activity between brains of interacting individuals engaged in joint motor tasks, empathy tasks, and affective touch, providing evidence of a neural basis for social interaction. - Recent work has explored biological mechanisms of self-other integration using techniques like the human dynamic clamp and examined questions around causality and explanation in multi-brain systems.

1. Inter-brain synchronization
as a marker of
human social cognition
in interactive contexts
Guillaume DUMAS & Suzanne DIKKER
Brain & Mind Computational Seminar
May 18th, 2021

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J.A. Scott Kelso
Emmanuelle Tognoli
Mengsen Zhang
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Merle Fairhurst
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4. A very brief history
of hyperscanning …

5. Disclaimer
Matel, 2006

6. Recent reviews

7. A growing interest …
1965?
Number
of
Publications
2010
2020
Montague et al. (2002)

8. Hyper-Parapsychology

9. Montague et al. (Neuroimage, 2002)
From Scanning to Hyperscanning

10. Babiloni et al. (Proceedings of the 28th IEEE, 2006)
Hypermethods for EEG hyperscanning

11. Tognoli et al. (PNAS, 2007)
The Phi neuromarker of Social Coordination

12. Tognoli et al., Society for Neurosciences 2005
Some « idiosyncrasic patterns » …

13. Lindenberger et al. BMC Neuroscience, 2009
Brain swinging in concert

14. Zhdanov et al. (PLoS ONE, 2015)
Dual-MEG

15. Bilek et al. (JAMA Psychiatry, 2017)
Application to clinical populations

16. Kingsbury et al. (Cell, 2019)
Correlated Neural Activity across Brains of Socially Interacting Animals

17. Sensorimotor loops and agentivity in dyads Probing the affective dimension of synchrony

18. Sensorimotor loops and agentivity in dyads Probing the affective dimension of synchrony

19. Nadel, 1999 ; Nadel & Soussignan, 2005 ; Soussignan & Nadel, 2006
Behavioral-Hyperscanning

20. Dumas et al. (PLoS ONE, 2010)
Dual-Video + Dual-EEG

21. Dumas et al. (PLoS ONE, 2010)
Behavioral analysis
Frame-by-frame
Analysis
Imitation (I) No-Imitation
Synchrony (S) Synchronous imitation Synchrony
No-Synchrony Imitation No Interaction

22. Dumas et al. (PLoS ONE, 2010)
Frame-by-frame…
25.15%
8.16%
12.66%
54.03%
SI
S
I
Summary:

23. Dumas et al. (Frontiers in Neuroscience, 2012)
Back to intra-individual level
Self-agency
Other-agency

24. Co-ownership of action
Nadel & Dumas (2014)

25. Inter-brain synchronisation during social interaction
Dumas et al. 2010

26. Wormhole…

27. Sensorimotor loops and agentivity in dyads Probing the affective dimension of synchrony

28. Zhang, Dumas, Kelso, Tognoli (2016)
Emotional responses during social coordination
GSR

29. Inter-brain synchronization in affective touch
Goldstein, Weissman-Fogel, Dumas, Shamay-Tsoory, PNAS (2018)
29
Pain reduction
Inter-brain
synchronization
modulation

30. Djalovski, Dumas, Kinreich, Feldman (NeuroImage, 2021)
Human attachments shape interbrain synchrony

31. Djalovski, Dumas, Kinreich, Feldman (NeuroImage, 2021)
Brain-behavior linkage in motor task

32. Djalovski, Dumas, Kinreich, Feldman (NeuroImage, 2021)
Brain-behavior linkage in motor task
N=158

33. Djalovski, Dumas, Kinreich, Feldman (NeuroImage, 2021)
Brain-behavior linkage in empathy task
N=158

34. Biological mechanisms
of self-other integration
Causality and explanation
in multi-brain neuroscience

35. Biological mechanisms
of self-other integration
Causality and explanation
in multi-brain neuroscience

36. Inter-brain synchronisation during social interaction
Dumas et al. (PLoS ONE, 2010)

37. Dumas et al. (PNAS 2014)
The Human Dynamic Clamp

38. Dumas, Moreau, Tognoli, Kelso (Cerebral Cortex, 2020)
Self vs. other neural dynamics

39. Dumas, Moreau, Tognoli, Kelso (Cerebral Cortex, 2020)
Self and other neural integration

40. Dumas, Moreau, Tognoli, Kelso (Cerebral Cortex, 2020)
The Human Dynamic Clamp
Cooperation
vs.
Competition
Human
vs.
Robot
rTPJ

41. Wormhole…

42. Biological mechanisms
of self-other integration
Causality and explanation
in multi-brain neuroscience

43. Reciprocal coupling & Spurious Alignment
Communication
Unidirectional
Reciprocal
Similarity
Behavioural
Neurobiological
Cultural
Dumas & Fairhurst (Royal Society Open Science, 2021)

44. Moreau & Dumas (TiCS, 2021)
Causality and explanation

45. Moreau & Dumas (TiCS, 2021)
Causality and explanation

46. Moreau & Dumas (TiCS, 2021)
Causality and explanation

47. Dumas et al. (PLoS ONE, 2012)
"in silico" Hyperscanning
+ x 2 =

48. "in silico" Hyperscanning
Dumas et al. (PLoS ONE, 2012)
Information exchanged
between the brains
Inter-brain
sync
Human connectomes facilitate inter-brain synchronization
Residual synchronization

49. Dumas et al. (PLoS ONE, 2012)
"in silico" Hyperscanning
Hahamy et al. (Nature Neuroscience, 2015)

50. guillaume.dumas@ppsp.team @introspection extrospection.eu / ppsp.team
… and now, place to Suzanne Dikker!
HyPyP: a Hyperscanning Python Pipeline for inter-brain connectivity analysis
Ayrolles et al. (SCAN, 2021)