The aim of this study was to quantify processing of different types of coherent motion in terms of ocular motor response times in a group of normally-developing children (age 0-12+ years old) using remote eye tracking. Motion coherence was applied in three different types of Random Dot Kinematograms (RDKs): vertical (RDK1) and diagonal (RDK2) motion and expansion (RDK3). Orienting eye movements were quantified using the Reaction Time to the first Fixation (RTF). The children were divided into two groups: the "youngest group" between 0-3+ years and the "oldest group" between 4-12+ years old. The results showed that RTF was significantly prolonged in the "youngest group" compared to the "oldest group" for each RDK. In the "oldest group", RTF was significantly affected by the type of RDK shown. The presented results suggest that, based on ocular motor responses, age-dependence of processing different types of coherent motion may be revealed.

Coherent motion, Eye movements, Eye tracking, Random dot kinematograms, Reaction time,
Journal of Medical Engineering and Technology
This research was supported by a grant from the Novum Foundation; a non-profit organization providing financial support to (research) projects that improve the quality of life of individuals with a visual impairment (
Department of Neuroscience

Pel, J.J.M, van der Zee, Y.J, Boot, F.H, Evenhuis, H.M, & van der Steen, J. (2013). Remote eye tracking assesses age dependence processing of coherent motion in typically-developing children. Journal of Medical Engineering and Technology, 37(2), 109–115. doi:10.3109/03091902.2012.752043