Humans Use Predictive Gaze Strategies to Target Waypoints for Steering.

Abstract:

:A major unresolved question in understanding visually guided locomotion in humans is whether actions are driven solely by the immediately available optical information (model-free online control mechanisms), or whether internal models have a role in anticipating the future path. We designed two experiments to investigate this issue, measuring spontaneous gaze behaviour while steering, and predictive gaze behaviour when future path information was withheld. In Experiment 1 participants (N = 15) steered along a winding path with rich optic flow: gaze patterns were consistent with tracking waypoints on the future path 1-3 s ahead. In Experiment 2, participants (N = 12) followed a path presented only in the form of visual waypoints located on an otherwise featureless ground plane. New waypoints appeared periodically every 0.75 s and predictably 2 s ahead, except in 25% of the cases the waypoint at the expected location was not displayed. In these cases, there were always other visible waypoints for the participant to fixate, yet participants continued to make saccades to the empty, but predictable, waypoint locations (in line with internal models of the future path guiding gaze fixations). This would not be expected based upon existing model-free online steering control models, and strongly points to a need for models of steering control to include mechanisms for predictive gaze control that support anticipatory path following behaviours.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Tuhkanen S,Pekkanen J,Rinkkala P,Mole C,Wilkie RM,Lappi O

doi

10.1038/s41598-019-44723-0

subject

Has Abstract

pub_date

2019-06-06 00:00:00

pages

8344

issue

1

issn

2045-2322

pii

10.1038/s41598-019-44723-0

journal_volume

9

pub_type

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