Measurement of Eye Movement in Visual Search for a Target Symbol and Simulation to Construct a Small-World Network

Ryunosuke Kodera, Shigehito Tanahashi, Atsuhiko Iijima, Yoshinobu Maeda
2017 Advanced Biomedical Engineering  
We investigated why movement of the human eye enables us to swiftly nd a target symbol out of many alternatives. To this end, we obtained experimental gaze step data, de ned as the distance between two serial gaze positions, on a monitor screen. The frequency distribution of this data approximately follows a power-law distribution. Using this frequency distribution, we constructed a network model to replicate the gaze step dynamics, in which the vertices (or nodes) and the paths between two
more » ... ices correspond to the gaze positions (tremors or drifts) and the gaze steps (saccades), respectively. The constructed network has the features of a small-world network. We suggest, therefore, that there is a physiological mechanism in visual search, which reduces the size of the physically wide search area. Such eye movement can nd the target symbol in a relatively short time proportional to the logarithm of the number of symbols on the screen.
doi:10.14326/abe.6.129 fatcat:qz3hcffbhfbbridtpvpegde3s4