Systematic localisation errors of multiple objects after saccades and eye-blinks H H Haladjian, E Wufong, T L Watson |
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Foundational Processes of Behaviour, University of Western Sydney, Australia
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| Previous studies have detected systematic spatial compression when holding a representation of object locations in working memory (WM). Similarly, spatial compression also occurs when making a saccade immediately after stimulus presentation. This compression may be due to an interaction between the eye movement itself and the WM effects, since these representations are held in WM across saccades. The effect of eye blinks has not been examined in this context. To better understand the source of localisation errors, the current study compares the effects of saccades and blinks when reproducing the locations of 1–5 randomly-placed discs (masked), presented immediately prior to a saccade or blink; these results are compared to a control condition where observers simply hold the representation in WM for the same duration. This experiment allows us to further explore the role of visual WM in the perceptual phenomena related to saccadic compression and establish the effect of blinking on localisation. Our findings show that overall localisation errors are higher in saccade trials than in blink and control trials (where performance is identical). Furthermore, multiple objects are mislocalised together, indicating a uniform shift in object locations toward the saccade target as opposed to a compression of space. |
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