RT Journal Article
JF IEEE Transactions on Visualization & Computer Graphics
YR 2011
VO 17
IS
SP 2440
TI Evaluation of Traditional, Orthogonal, and Radial Tree Diagrams by an Eye Tracking Study
A1 Daniel Weiskopf,
A1 Michael Burch,
A1 Julian Heinrich,
A1 Natalia Konevtsova,
A1 Markus Hoeferlin,
K1 Hierarchy visualization
K1 node-link layout
K1 eye tracking
K1 user study.
AB Node-link diagrams are an effective and popular visualization approach for depicting hierarchical structures and for showing parent-child relationships. In this paper, we present the results of an eye tracking experiment investigating traditional, orthogonal, and radial node-link tree layouts as a piece of empirical basis for choosing between those layouts. Eye tracking was used to identify visual exploration behaviors of participants that were asked to solve a typical hierarchy exploration task by inspecting a static tree diagram: finding the least common ancestor of a given set of marked leaf nodes. To uncover exploration strategies, we examined fixation points, duration, and saccades of participants' gaze trajectories. For the non-radial diagrams, we additionally investigated the effect of diagram orientation by switching the position of the root node to each of the four main orientations. We also recorded and analyzed correctness of answers as well as completion times in addition to the eye movement data. We found out that traditional and orthogonal tree layouts significantly outperform radial tree layouts for the given task. Furthermore, by applying trajectory analysis techniques we uncovered that participants cross-checked their task solution more often in the radial than in the non-radial layouts.
PB IEEE Computer Society, [URL:http://www.computer.org]
SN 1077-2626
LA English
DO 10.1109/TVCG.2011.193
LK http://doi.ieeecomputersociety.org/10.1109/TVCG.2011.193