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The saccadic flow baseline: Accounting for image-independent biases in fixation behaviour

Clarke, Alasdair DF and Stainer, Matthew J and Tatler, Benjamin W and Hunt, Amelia R (2017) 'The saccadic flow baseline: Accounting for image-independent biases in fixation behaviour.' Journal of Vision, 17. ISSN 1534-7362

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Abstract

Much effort has been made to explain eye guidance during natural scene viewing. However, a substantial component of fixation placement appears to be a set of consistent biases in eye movement behavior. We introduce the concept of saccadic flow, a generalization of the central bias that describes the image-independent conditional probability of making a saccade to (xi+1, yi+1), given a fixation at (xi, yi). We suggest that saccadic flow can be a useful prior when carrying out analyses of fixation locations, and can be used as a submodule in models of eye movements during scene viewing. We demonstrate the utility of this idea by presenting bias-weighted gaze landscapes, and show that there is a link between the likelihood of a saccade under the flow model, and the salience of the following fixation. We also present a minor improvement to our central bias model (based on using a multivariate truncated Gaussian), and investigate the leftwards and coarse-to-fine biases in scene viewing.

Item Type: Article
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RE Ophthalmology
Divisions: Faculty of Science and Health > Psychology, Department of
Depositing User: Jim Jamieson
Date Deposited: 12 May 2017 08:54
Last Modified: 05 Feb 2019 15:15
URI: http://repository.essex.ac.uk/id/eprint/19657

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