Neural responses to proxemic distance regulation in urban public spaces in the post-COVID context using a portable electroencephalogram

The intersection of cognitive neuroscience and urban studies is yielding novel insights into how human environments shape our experiences. Recent advancements are providing objective measures to understand the complex interplay between individuals and their surroundings, particularly concerning proxemics – the study of how people use and perceive space. A groundbreaking exploratory study, conducted in the post-COVID-19 era, has utilized portable electroencephalography (EEG) to investigate the neural responses associated with interpersonal distances in urban settings. This research, published in Frontiers in Psychology, suggests that the pandemic may have subtly recalibrated our perceptions of personal space, leading to observable changes in brain activity and behavior.

Background: The Evolving Landscape of Personal Space

For decades, proxemic theory, pioneered by anthropologist Edward T. Hall, has categorized interpersonal distances into zones: intimate, personal, social, and public. These zones, while culturally influenced, have provided a foundational understanding of how we navigate social interactions and maintain comfort in shared spaces. However, the unprecedented global experience of the COVID-19 pandemic, with its widespread social distancing mandates and heightened awareness of contagion, has inevitably impacted these established norms.

The pandemic forced a radical, albeit temporary, redefinition of personal and social boundaries. While many studies have documented behavioral and perceptual shifts, this new research delves deeper, seeking to uncover the underlying neurophysiological mechanisms. By examining brainwave patterns, specifically in the alpha and low-beta frequency bands, the study aims to quantify the cognitive and attentional responses to varying degrees of interpersonal proximity in a real-world urban environment.

Methodology: A Neuroscientific Glimpse into Urban Interactions

The study employed a quasi-experimental design, focusing on participants in an outdoor urban setting at the University of Tehran in 2022. This timing is crucial, representing a transitional period where immediate pandemic restrictions had eased, but lingering behavioral adaptations were still likely present.

Phase 1 of the study involved a questionnaire-based screening to select participants with moderate-to-strong interpersonal communication skills. This ensured a more homogenous group for the subsequent EEG experiment. Three original questionnaires assessed friendship skills, confidence skills, and non-verbal communication abilities, alongside a brief measure of COVID-19-related perceptions.

In Phase 2, nine carefully selected participants (five women, four men, aged 20-30) were fitted with portable EEG equipment. The experimental procedure involved controlled scenarios where an actor approached the participant. The setup was designed to minimize external distractions while maintaining ecological validity. The modular pavement pattern of the urban site served as a spatial reference for defining personal and social proxemic zones. Pre-scenography using the Previs Pro App ensured consistency in actor positioning and simulated lighting conditions, with three cameras recording the interactions for later synchronization with EEG data.

A baseline period was established with the participant standing alone, followed by the actor’s gradual approach, adhering to predetermined distances corresponding to social and personal zones. Participants were informed about the general experiment but not the specific timing of the actor’s movements, allowing for a more naturalistic response. Temporal markers, synchronized with the EEG system, precisely logged the onset of the baseline, entry into proxemic zones, and exit from them.

The EEG data processing focused on alpha (8-12 Hz), associated with relaxation, and low-beta (12-15 Hz), linked to attentional engagement. These frequency bands were chosen for their established roles in cognitive and emotional processing. Statistical analyses, including paired-sample t-tests or Wilcoxon signed-rank tests, were used to compare EEG activity across different proxemic conditions, with significance set at p < 0.05.

Key Findings: The Brain’s Reaction to Proximity

The study’s findings provide compelling evidence for the neurophysiological impact of interpersonal distance. Representative EEG data for one participant illustrated a clear shift in neural activity following the actor’s approach. Prior to the proxemic intrusion, alpha power was relatively high and evenly distributed, suggesting a state of mental relaxation. Low-beta power was moderate, indicating baseline attentional levels.

Upon the actor’s approach, a significant decrease in alpha power was observed, particularly in the parietal and occipital regions. This reduction is consistent with previous research linking lower alpha activity to increased vigilance, stress, and heightened cognitive processing in response to perceived spatial boundary violations. Simultaneously, there was a substantial increase in low-beta power, especially in the frontal and central regions. This surge signifies heightened attentional processing and increased cognitive engagement as the interpersonal distance diminished.

Collectively, these neural changes suggest an anticipatory response to perceived proximity intrusions, aligning with threat-response and vigilance models in proxemic interaction research. For a majority of participants, these neural patterns were accompanied by behavioral observations. Notably, 44% of participants maintained interpersonal distances exceeding classical proxemic norms. This suggests a potential recalibration of their perceived comfort zones, possibly influenced by the prolonged social distancing practices during the pandemic.

Analysis: Beyond Behavior to Neurophysiology

The convergence of these neurophysiological and behavioral findings is particularly significant. The observed reduction in alpha and increase in low-beta activity during proxemic intrusion offers a quantifiable neural correlate for the discomfort or heightened awareness associated with close proximity. This goes beyond self-reported feelings or observed behaviors, providing a more objective measure of the human-environment interaction.

The behavioral finding that a substantial portion of participants maintained distances greater than traditional social zones is a critical indicator. While the pandemic is largely behind us, its impact on our spatial habits and perceptions may not be. This suggests that urban designers and architects may need to consider these evolved proxemic preferences when planning public spaces. The implication is that spaces designed with ample personal space might contribute more effectively to mental comfort and reduce latent stress in urban dwellers.

This study’s strength lies in its attempt to bridge the gap between abstract proxemic theories and measurable biological responses. By using portable EEG, the research demonstrates the feasibility of studying these phenomena in real-world, ecologically valid settings, rather than solely relying on laboratory conditions. This opens avenues for neuroarchitecture – a field that seeks to integrate neuroscience into the design of buildings and cities to optimize human well-being.

Implications for Urban Design and Public Spaces

The findings have direct implications for how we design and experience urban environments. In the post-COVID world, a heightened awareness of personal space might persist. Urban planners and architects could leverage this understanding by:

• Designing for greater buffer zones: Incorporating more generous spacing between seating areas, pathways, and public amenities.
• Creating adaptable spaces: Designing areas that can be easily reconfigured to accommodate varying levels of desired proximity.
• Utilizing visual cues: Employing architectural elements or landscaping to subtly guide pedestrian flow and encourage natural distancing.
• Prioritizing mental comfort: Moving beyond purely functional or aesthetic considerations to actively design for psychological well-being, informed by neuroscientific insights.

The study also highlights the importance of considering cultural and contextual factors. While this research was conducted in Iran, the underlying neurophysiological responses to spatial proximity are likely to have universal components, though their behavioral manifestations may vary culturally.

Limitations and Future Directions

Despite its innovative approach, the study acknowledges several limitations. The relatively small sample size (N=9) for the EEG experiment necessitates cautious interpretation and limits the generalizability of the findings. The data collection, occurring during a transitional post-COVID period, also means direct pre-pandemic comparisons were not possible.

Future research should aim to:

• Increase sample size and diversity: Recruiting larger and more diverse participant groups to enhance the robustness and generalizability of the findings.
• Employ longitudinal designs: Tracking individuals’ proxemic behavior and neural responses over extended periods to determine the persistence of post-pandemic adaptations.
• Integrate complementary measures: Combining EEG with other physiological indicators (e.g., heart rate variability, galvanic skin response) and qualitative data to provide a more comprehensive understanding of stress and comfort.
• Explore virtual and mixed reality: Utilizing immersive technologies to create controlled yet ecologically valid environments for further investigation.
• Conduct cross-cultural comparisons: Examining how these neural and behavioral responses to proxemic distance vary across different cultural contexts.

Conclusion: Towards Neuro-Informed Urbanism

This exploratory study provides preliminary but significant neurophysiological evidence that interpersonal distance regulation in urban public spaces is associated with measurable changes in brain activity. The observed patterns of reduced alpha and increased low-beta power during proxemic intrusion suggest that individuals exhibit heightened cognitive engagement and vigilance when their personal space is approached. Furthermore, the behavioral observation of maintaining larger-than-classical distances suggests that the COVID-19 pandemic may have left a lasting imprint on our proxemic norms.

By bridging cognitive neuroscience and urban studies, this research underscores the critical role of interpersonal distance in shaping mental comfort within built environments. The findings advocate for a more nuanced approach to urban and architectural design, one that actively considers the neurophysiological underpinnings of human spatial behavior. As we continue to navigate the post-pandemic world, understanding and responding to these evolving proxemic landscapes will be crucial for creating more comfortable, functional, and psychologically attuned urban spaces. The integration of such objective, neuroscientific data promises to revolutionize how we design and inhabit our cities.