| Sumario: | This study aimed to assess the impact of manipulating postural stability during the execution of the multiple objects tracking (MOT) task on gaze behaviour. Twenty-eight males performed the MOT task under three levels of postural stability while eye movements were recorded. Postural stability had a significant impact on MOT scores and gaze behaviour. Participants exhibited worse MOT performance (p < 0.001, η² = 0.20) in less stable conditions, showing a reduced fixation duration (p = 0.020, η² = 0.09) and increased saccade frequency (p = 0.013, η² = 0.10). As stability conditions decreased, participants shifted their gaze strategies by an average of 12.34% of the time distribution from maintaining fixation on a central location to adopting the target-looking strategy. Additionally, the decline in MOT scores with decreasing stability was correlated with a reduction in fixation duration (r = 0.409, p = 0.031). The findings evidence that gaze behaviour during MOT is dependent on postural stability and MOT performance is influenced by the chosen gaze strategy. Key points: Reduced postural stability significantly impairs the ability to track multiple objects. Changes in postural stability during a multiple object tracking task affect gaze behaviour by alterations in fixation duration and saccadic frequency. Decrease in multiple object tracking task scores is associated with alterations in gaze behaviour, specifically a reduction in fixation duration. Participants shifted their gaze strategies from maintaining fixation on a central location to adopting a saccadic target-looking strategy as stability conditions decreased.
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