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  Mimicking schizophrenia: Reducing P300b by minimally fragmenting healthy participants’ selves using immersive virtual reality embodiment

Spanlang, B., Nierula, B., Haffar, M., & Debruille, J. B. (2019). Mimicking schizophrenia: Reducing P300b by minimally fragmenting healthy participants’ selves using immersive virtual reality embodiment. Frontiers in Human Neuroscience, 12: 504. doi:10.3389/fnhum.2018.00504.

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Spanlang, Bernhard 1, Author
Nierula, Birgit1, 2, Author           
Haffar, Maud 3, 4, Author
Debruille, J. Bruno 3, 4, 5, Author
1Event-Lab, Department of Clinical Psychology and Psychobiology, University of Barcelona, Spain, ou_persistent22              
2Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain, ou_persistent22              
3Department of Neuroscience, McGill University, Montréal, QC, Canada, ou_persistent22              
4Douglas Research Centre, McGill University, Montréal, QC, Canada, ou_persistent22              
5Department of Psychiatry, McGill University, Montréal, QC, Canada, ou_persistent22              


Free keywords: Schizophrenia; Self; P300b; P3b; LPC; LPP; Functional significance; Embodiment in immersive virtual reality
 Abstract: The most robust and clear biological index differentiating persons with schizophrenia from healthy controls is the drastic reduction of the amplitude of their P300b event-related brain potential (ERP). However, the cause of that reduction remains obscure. Nevertheless, the P300b belongs to the family of the late posterior positivities (LPPs) which are closely related to the consciousness of the meaning of the stimulus in the task for the participants themselves (e.g., the: I am seeing the target stimulus for which I have to respond). The fragmentation of the self present in schizophrenia, could thus be the cause. If this were true, then P300bs should be somewhat reduced in healthy participants when their self representations are temporarily and minimally fragmented. We tested this hypothesis by using the innocuous fragmentation of the self that occurs in virtual reality (VR). There, participants can have a fragment of their self in an avatar they feel embodied in, within a VR room, while having another fragment of their self in their real body in the real room where they know they are. Our participants were thus equipped with a head mounted display in which they viewed a virtual room where a female humanoid avatar was facing them. She was lifting her right hand in synchrony with the participants, in order to induce in them a feeling of embodiment. Stimuli were a frequent green- and a rare red-disk, the oddball stimulus, occurring over the right hand of the avatar. Participants had to perform a Go/NoGo task, lifting their right hand to the frequent green disk and repressing this action for the oddball red disk. In the syncMove block of trials the avatar was lifting her right hand synchronously with the participant, disturbing her self representation as confirmed by the debriefing session. In the noMove block, the avatar remained immobile. In the classic block, only the red and the green disk were displayed on a monochrome background, neither the room nor the avatar were shown. As predicted, P300bs were found to be smaller in the syncMove block than in the noMove- and the classic-block in participants who had the classically large P300b oddball effect between ERPs to the frequent and those to the rare stimuli. Reduced P300bs of schizophrenia could thus be partly due to self fragmentation. Results may also open an avenue of research to the functional significance of LPPs and the content of the consciousness indexed by these potentials.


Language(s): eng - English
 Dates: 2018-08-082018-12-032019-01-04
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3389/fnhum.2018.00504
PMID: 30662398
PMC: PMC6328438
Other: eCollection 2018
 Degree: -



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Project name : Transcending Reality Activating Virtual Environment Responses through Sensory Enrichment / TRAVERSE
Grant ID : 227985
Funding program : Funding Programme 7
Funding organization : European Commission (EC)
Project name : -
Grant ID : 2017 SGR 1296
Funding program : -
Funding organization : Neurovirtual GRC Group
Project name : -
Grant ID : -
Funding program : CERCA Programme
Funding organization : Generalitat de Catalunya
Project name : -
Grant ID : 194517-03
Funding program : -
Funding organization : Natural Sciences and Engineering Research Council of Canada (NSERC)

Source 1

Title: Frontiers in Human Neuroscience
  Abbreviation : Front Hum Neurosci
Source Genre: Journal
Publ. Info: Lausanne, Switzerland : Frontiers Research Foundation
Pages: - Volume / Issue: 12 Sequence Number: 504 Start / End Page: - Identifier: ISSN: 1662-5161
CoNE: https://pure.mpg.de/cone/journals/resource/1662-5161