  This study investigates the influence of varying illumination levels on
architectural experiences by employing a comprehensive approach that combines
self-reported assessments and neurophysiological measurements. Thirty
participants were exposed to nine distinct illumination conditions in a
controlled virtual reality environment. Subjective assessments, collected
through questionnaires in which participants were asked to rate how pleasant,
interesting, exciting, calming, complex, bright and spacious they found the
space. Objective measurements of brain activity were collected by
electroencephalogram (EEG). Data analysis demonstrated that illumination levels
significantly influenced cognitive engagement and different architectural
experience indicators. This alignment between subjective assessment and EEG
data underscores the relationship between illuminance and architectural
experiences. The study bridges the gap between quantitative and qualitative
assessments, providing a deeper understanding of the intricate connection
between lighting conditions and human responses. These findings contribute to
the enhancement of environmental design based on neuroscientific insights,
emphasizing the critical role of well-considered daylighting design in
positively influencing occupants' cognitive and emotional states within built
environments.
