Psychological research is increasingly moving online, where web-based studies allow for data collection at scale. Behavioural researchers are well-supported by existing tools for participant recruitment, and for building and running experiments with decent timing. However, not all techniques are portable to the internet: While eye tracking works in tightly controlled conditions in the lab, webcam-based eye tracking suffers from high attrition and poorer quality due to basic limitations like

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... am availability, poor image quality, and reflections on glasses and the cornea. Here we present MouseView.js, an alternative to eye tracking that can be employed in web-based attention research. Inspired by the visual system, MouseView.js blurs the display to mimic peripheral vision, but allows participants to move a sharp aperture that is roughly the size of the fovea. Like eye gaze, the aperture can be directed to fixate on stimuli of interest. We validated MouseView.js in an online version (N=165) of an established free viewing task (N=83), where it proved as reliable as gaze, and produced the same pattern of dwell time results. In addition, dwell time differences from MouseView.js and from previous gaze studies correlated with self-report measures in similar ways. The tool is open-source, implemented in JavaScript, and usable within Gorilla and jsPsych, or as standalone library. In sum, MouseView.js is a freely available instrument for attention-tracking that is both reliable and valid, and that can replace eye tracking in certain web-based psychological experiments.