Searching and fixating: Scale-invariance vs. characteristic timescales in attentional processes
Theory Department, S N Bose National Centre - Block JD Sector III, Salt Lake, Calcutta 700098, India
2 Centre for Behavioural and Cognitive Sciences, University of Allahabad - Allahabad, India
Accepted: 5 May 2011
In an experiment involving semantic search, the visual movements of sample populations subjected to visual and aural input were tracked in a taskless paradigm. The probability distributions of saccades and fixations were obtained and analyzed. Scale-invariance was observed in the saccadic distributions, while the fixation distributions revealed the presence of a characteristic (attentional) time scale for literate subjects. A detailed analysis of our results suggests that saccadic eye motions are an example of Levy, rather than Brownian, dynamics.
PACS: 89.75.-k – Complex systems / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 05.45.Tp – Time series analysis
© EPLA, 2011