Adaptation training affects EEG inter-hemispheric connectivity during visual roll stimulation
Poster No:
1263
Submission Type:
Abstract Submission
Authors:
Yue WEI1, Yixuan Wang2, Richard SO3
Institutions:
1Shenzhen University, Shenzhen, Guangdong, 2HKUST-Shenzhen Research Institute, Shenzhen, Guangdong, 3The Hong Kong University of Science and Technology, Hong Kong, Hong Kong
First Author:
Co-Author(s):
Introduction:
VIMS is a common discomfort experienced by stationary viewers exposed to visual motion, characterized by symptoms such as disorientation, oculomotor disturbance, and nausea. It poses significant challenges to user experiences in virtual reality (VR) and large-screen movies.
The study aims to address three main limitations in previous research: 1) the focus on local brain activity rather than dynamic connectivity, 2) between-subject susceptibility differences confounded by various individual factors, and 3) the use of only one type of visual stimulus. To overcome these limitations, the study examines changes in brain dynamics before and after enhancing individual susceptibility through adaptation training, using two types of experimental stimuli involving different axis rotations.
The study aims to address three main limitations in previous research: 1) the focus on local brain activity rather than dynamic connectivity, 2) between-subject susceptibility differences confounded by various individual factors, and 3) the use of only one type of visual stimulus. To overcome these limitations, the study examines changes in brain dynamics before and after enhancing individual susceptibility through adaptation training, using two types of experimental stimuli involving different axis rotations.
Methods:
A total of 16 right-handed participants were recruited for the study. They completed pre-training, training, and post-training stages. In the pre-training stage, baseline EEG phase synchronization and VIMS susceptibility were measured under two types of VIMS-provoking stimulation: roll rotation (ROL) and pitch rotation (PIT). Participants were classified into VIMS-resistant (VIMSres) and VIMS-susceptible (VIMSsus) groups based on their MaxNausea levels during pre-training exposure.
The training stage involved repeated daily exposures to ROL stimulation for the VIMSsus group. The completion criteria for the adaptation training stage were: 1) MaxNausea scores reported by a participant in two consecutive sessions were both lower than 2, and 2) the participant had completed a minimum of 7 behavioral (BEH) sessions. Trainees were permitted to engage in up to 10 BEH sessions.
In the post-training stage, VIMS susceptibility and EEG phase synchronization were re-evaluated under both ROL and PIT stimulations. The results showed that the VIMSsus group demonstrated a significant increase in nausea score with increasing exposure to VIMS provoking stimulation, while the VIMSres group maintained a consistently low level of nausea. The SSQ score of the VIMSsus group was significantly higher than that of the VIMSres group, confirming differential susceptibility to VIMS.
The training stage involved repeated daily exposures to ROL stimulation for the VIMSsus group. The completion criteria for the adaptation training stage were: 1) MaxNausea scores reported by a participant in two consecutive sessions were both lower than 2, and 2) the participant had completed a minimum of 7 behavioral (BEH) sessions. Trainees were permitted to engage in up to 10 BEH sessions.
In the post-training stage, VIMS susceptibility and EEG phase synchronization were re-evaluated under both ROL and PIT stimulations. The results showed that the VIMSsus group demonstrated a significant increase in nausea score with increasing exposure to VIMS provoking stimulation, while the VIMSres group maintained a consistently low level of nausea. The SSQ score of the VIMSsus group was significantly higher than that of the VIMSres group, confirming differential susceptibility to VIMS.
Results:
The training results indicated that adaptation training effectively reduced the subsequent VIMS response to ROL stimulation in susceptible individuals. Most trained participants completed the training within 7 sessions, and the MaxNausea scores and SSQ scores of the VIMSsus group showed a significant reduction after training. The training effects successfully transferred to the PIT condition in terms of nausea, with a significant reduction in MaxNausea scores for the VIMSsus group.
To identify the critical time window related to self-motion perception, the study compared the averaged global PLV node strength between the random (RAN) condition and each rotation condition (ROL, PIT). The results showed that the VIMSres group displayed stronger inter-hemispheric PLV values compared to the VIMSsus group, supporting the hypothesis that inter-hemispheric connectivity is associated with resistance to motion sickness.
To identify the critical time window related to self-motion perception, the study compared the averaged global PLV node strength between the random (RAN) condition and each rotation condition (ROL, PIT). The results showed that the VIMSres group displayed stronger inter-hemispheric PLV values compared to the VIMSsus group, supporting the hypothesis that inter-hemispheric connectivity is associated with resistance to motion sickness.
·Figure 1: Protocol
·Figure 2: Phase Locking Values Increase with VIMS Resistance
Conclusions:
The study found that inter-hemispheric PLV values were enhanced when susceptibility was reduced, and this effect was observed for both types of visual stimuli (ROL and PIT), suggesting that this inter-hemispheric EEG phase synchronization is associated with general VIMS susceptibility rather than specific types of visual stimuli.
Overall, this study is the first to utilize adaptation training and discover that functional brain connectivity strengthens as susceptibility to VIMS decreases.
The research highlights the crucial link between susceptibility to VIMS and the strength of inter-hemispheric connectivity in the temporal and parietal lobes. These discoveries open up avenues for future utilization in the real-time tracking of variations in individual susceptibility to motion sickness via EEG, potentially aiding in the prevention, tracking, and mitigation of VIMS.
This is a preliminary experiment, and the complete data and results have been submitted in the manuscript titled 'Manuscript submitted to Cognitive Neurodynamics (under review).
Overall, this study is the first to utilize adaptation training and discover that functional brain connectivity strengthens as susceptibility to VIMS decreases.
The research highlights the crucial link between susceptibility to VIMS and the strength of inter-hemispheric connectivity in the temporal and parietal lobes. These discoveries open up avenues for future utilization in the real-time tracking of variations in individual susceptibility to motion sickness via EEG, potentially aiding in the prevention, tracking, and mitigation of VIMS.
This is a preliminary experiment, and the complete data and results have been submitted in the manuscript titled 'Manuscript submitted to Cognitive Neurodynamics (under review).
Higher Cognitive Functions:
Higher Cognitive Functions Other
Modeling and Analysis Methods:
Classification and Predictive Modeling
Connectivity (eg. functional, effective, structural) 1
Perception, Attention and Motor Behavior:
Perception: Multisensory and Crossmodal
Perception: Visual 2
Keywords:
Electroencephaolography (EEG)
Machine Learning
Plasticity
Other - Inter-hemispheric connectivity；Phase Synchronization；Visually Induced Motion Sickness
1|2Indicates the priority used for review
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