عباسعلی شاهرودی

Architectural objects are a part of constituent elements of the environment that significantly affect the emotional behavior of human life. Building facades are an important basic pattern for the structure of buildings and provide an impressive view of cities. This study experimentally investigated the influence of the constituent elements of the building facades on the population brain signals and behavioral reactions of human subjects. EEG signals were collected by g.tec data aquisiion (64 channel electrodes) from 18 human subjects (male students; 23 to 26 years old) when the façade buildings were presented on the screen located in front of subjects (70 cm). It should be mention that facades appeared on the screen were modeled with 3d max software. The EEG signals were low pass filtered (< 250 Hz) with a fourth-order Buttherworth filter and a fast Fourier transform (FFT function in MATLAB; version 2013) was used to convert the EEG signals into different frequency bands: delta (0.5-3 Hz), theta (3-7.5 Hz), alpha (7.5-13 Hz), beta (13-31 Hz), and gamma (31-100 Hz) frequencies. We also used WICA and a Butterworth notch filter for removing eyeblinking artifacts and the 50 Hz noise, respectively. Finally, the mean power at different frequency bands of EEG signals was studied in different lobes of the brain. We investigated the modulation of human brain activity by showing three categories of building facades including geometries and proportions of windows, and materials used in the facade of buildings. The primary results show a significant increase in beta frequency oscillations in occipital and parietal lobes when the pleasant facades of the geometry of windows and materials were shown on the screen (p<0.001, t-test) and an inversely significant decrease in beta frequency oscillations when the unpleasant facades were presented (p<0.001, t-test). Moreover, the proportion of windows with arcuate and rectangular shapes in a horizontal stretch generated an inversely rela