Walking on the Edge: Brain Connectivity Changes in Response to Virtual Height Challenges.

Area of Science:

• Neuroscience
• Cognitive Science
• Human-Computer Interaction

Background:

• Virtual reality (VR) offers controlled environments to study neural responses to simulated threats.
• Understanding brain adaptations to perceived danger during movement is crucial for various applications, including rehabilitation.

Purpose of the Study:

• To investigate brain network adaptations (connectivity, modularity, centrality) during locomotion in VR under neutral versus height-induced threat conditions.
• To analyze regional and global brain network changes using electroencephalography (EEG).

Main Methods:

• Seventy-five healthy participants completed a VR task involving walking on a virtual plank at street level (neutral) and 80 floors high (threat).
• EEG data were collected and analyzed for functional connectivity, modularity, and eigenvector centrality across different brain regions during task preparation and active walking.
• Repeated-measures ANOVAs were used to assess the effects of task and condition.

Main Results:

• Height-induced threat significantly increased frontal connectivity, suggesting enhanced cognitive-emotional regulation.
• Central connectivity increased during walking under threat, indicating heightened sensorimotor integration.
• Reduced modularity in the negative condition suggests decreased functional segregation, while increased eigenvector centrality in frontal and parietal regions highlights their role as network hubs.

Conclusions:

• VR height simulations effectively modulate regional and global brain network properties.
• Findings demonstrate adaptive brain responses, enhancing integration across cognitive, motor, and visual systems under perceived threat.
• This research supports the utility of VR in understanding and potentially treating maladaptive responses to threat and in rehabilitation settings.