The neuroaesthetics of architectural spaces.

People in developed countries spend over 90% of their time in built environments. Yet, we know little about its pervasive and often hidden effects on our mental state and our brain. Despite growing interest in the neuroscience of architecture, much of this scholarship has been descriptive. The typical approach is to map knowledge of the brain onto constructs important to architecture. For a programmatic line of research, how might descriptive neuroarchitecture be transformed into an experimental science? We review the literature outlining how one might consider experimental architecture first by examining the role of natural features in architectural settings. We then turn to the human experience of occupants, and hypothesized that aesthetic responses to architectural interiors reduce to key psychological dimensions. Conducting Psychometric Network Analysis (PNA) and Principal Components Analysis (PCA) on responses to curated images, we identified three components: coherence (ease of organizing and comprehending a scene), fascination (informational richness and generated interest), and hominess (personal ease and comfort). Coherence and fascination are well-established dimensions for natural scenes. Hominess was a new dimension related to architectural interiors. Central to all three communities in the PNA was emotional valence. We also reanalyzed data from an earlier fMRI study in which participants made beauty and approach-avoidance decisions while viewing the same images. Regardless of task, the degree of fascination covaried with neural activity in the right lingual gyrus. In contrast, coherence covaried with neural activity in the left inferior occipital gyrus only when participants judged beauty, and hominess covaried with neural activity in the left cuneus only when they made approach-avoidance decisions. The visual brain harbours hidden sensitivities to architectural interiors that are captured by the dimensions of coherence, fascination, and hominess. These findings represent first steps towards an experimental neuroarchitecture.