TY  - JOUR
A1  - Trukenbrod, Hans Arne
A1  - Barthelme, Simon
A1  - Wichmann, Felix A.
A1  - Engbert, Ralf
T1  - Spatial statistics for gaze patterns in scene viewing
BT  - effects of repeated viewing
JF  - Journal of vision
N2  - Scene viewing is used to study attentional selection in complex but still controlled environments. One of the main observations on eye movements during scene viewing is the inhomogeneous distribution of fixation locations: While some parts of an image are fixated by almost all observers and are inspected repeatedly by the same observer, other image parts remain unfixated by observers even after long exploration intervals. Here, we apply spatial point process methods to investigate the relationship between pairs of fixations. More precisely, we use the pair correlation function, a powerful statistical tool, to evaluate dependencies between fixation locations along individual scanpaths. We demonstrate that aggregation of fixation locations within 4 degrees is stronger than expected from chance. Furthermore, the pair correlation function reveals stronger aggregation of fixations when the same image is presented a second time. We use simulations of a dynamical model to show that a narrower spatial attentional span may explain differences in pair correlations between the first and the second inspection of the same image.
KW  - scene viewing
KW  - pair correlation function
KW  - spatial correlations
Y1  - 2019
U6  - https://doi.org/10.1167/19.6.5
SN  - 1534-7362
VL  - 19
IS  - 5
SP  - 1
EP  - 19
PB  - Association for Research in Vision and Opthalmology
CY  - Rockville
ER  -