Seeing and ballistic pointing at perisaccadic targets

Morrone, Maria Concetta; Ma-Wyatt, Anna; Ross, John

doi:10.1167/5.9.7

Cited by 31 publications

(21 citation statements)

References 63 publications

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“…This compression is still not fully understood. The compression is not found when the experiment is performed in the dark (Dassonville et al 1992), the critical issue being whether there are visual references after the saccade (Lappe et al 2000;Morrone et al 2005a), but even studies performed in a dimly lit room do not always show this compression (Brenner et al 2005). The compression has been related to saccadic speed because it is negligible for saccades that are Ͻ5° (Ostendorf et al 2007) or to changing receptive field size and location (Hamker et al 2008).…”

Section: Discussionmentioning

confidence: 99%

Temporal Information Can Influence Spatial Localization

Maij

Brenner²,

Smeets³

2009

Journal of Neurophysiology

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To localize objects relative to ourselves, we need to combine various sensory and motor signals. When these signals change abruptly, as information about eye orientation does during saccades, small differences in latency between the signals could introduce localization errors. We examine whether independent temporal information can influence such errors. We asked participants to follow a randomly jumping dot with their eyes and to point at flashes that occurred near the time they made saccades. Such flashes are mislocalized. We presented a tone at different times relative to the flash. We found that the flash was mislocalized as if it had occurred closer in time to the tone. This demonstrates that temporal information is taken into consideration when combining sensory information streams for localization.

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Section: Discussionmentioning

confidence: 99%

Temporal Information Can Influence Spatial Localization

Maij

Brenner²,

Smeets³

2009

Journal of Neurophysiology

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“…Localization in the fronto-parallel plane depends critically on the presence of visual references and/or the background lighting conditions (Lappe et al, 2000;Morrone et al, 2005a). In the second experiment we tested whether localization in depth shows a similar dependency.…”

Section: Experiments 2: Depth and Vernier Judgments In The Presence Ofmentioning

confidence: 99%

“…A large number of studies have investigated the localization of perisaccadically flashed stimuli to test how the visual system accounts perceptually for the large changes in gaze direction (e.g., Cai, Pouget, Schlag-Rey, & Schlag, 1997;Honda, 1989Honda, , 1991Lappe, Awater, & Krekelberg, 2000;. Two distinct patterns of mislocalization in the fronto-parallel plane were observed which seem to depend on the presence of visual references and/or the ambient lighting conditions (Lappe et al, 2000;Morrone, Ma-Wyatt, & Ross, 2005a). In the dark, i.e., in the absence of visual references, perisaccadically flashed stimuli are uniformly mislocalized in the direction of the saccade vector when flashed prior to saccade onset, and in the opposite direction shortly thereafter (perisaccadic shift: Cai et al, 1997;Honda, 1989Honda, , 1991.…”

Section: Introductionmentioning

confidence: 99%

Depth perception during saccades

et al. 2008

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A number of studies have investigated the localization of briefly flashed targets during saccades to understand how the brain perceptually compensates for changes in gaze direction. Typical version saccades, i.e., saccades between two points of the horopter, are not only associated with changes in gaze direction, but also with large transient changes of ocular vergence. These transient changes in vergence have to be compensated for just as changes in gaze direction. We investigated depth judgments of perisaccadically flashed stimuli relative to continuously present references and report several novel findings. First, disparity thresholds increased around saccade onset. Second, for horizontal saccades, depth judgments were prone to systematic errors: Stimuli flashed around saccade onset were perceived in a closer depth plane than persistently shown references with the same retinal disparity. Briefly before and after this period, flashed stimuli tended to be perceived in a farther depth plane. Third, depth judgments for upward and downward saccades differed substantially: For upward, but not for downward saccades we observed the same pattern of mislocalization as for horizontal saccades. Finally, unlike localization in the fronto-parallel plane, depth judgments did not critically depend on the presence of visual references. Current models fail to account for the observed pattern of mislocalization in depth.

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“…He argued that the “visual cue” Honda postulated is actually a post-saccadic visual reference, and this reference generates the compression pattern during a post-saccadic signal retrieval stage (Awater & Lappe, 2006). Using a liquid crystal shutter to control the availability of visual reference, Morrone et al (2005) argued that the reference does not have to be post-saccadic, in order to induce mislocalization. Whatever the critical timing is, it is clear that visual reference plays a role in peri-saccadic mislocalization.…”

Section: Discussionmentioning

confidence: 99%

Salient stimulus attracts focus of peri-saccadic mislocalization

2014

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Visual localization during saccadic eye movements is prone to error. Flashes shortly before and after the onset of saccades are usually perceived to shift towards the saccade target, creating a “compression” pattern. Typically, the saccade landing point coincides with a salient saccade target. We investigated whether the mislocalization focus follows the actual saccade landing point or a salient stimulus. Subjects made saccades to either a target or a memorized location without target. In some conditions, another salient marker was presented between the initial fixation and the saccade landing point. The experiments were conducted on both black and picture backgrounds. The results show that: (a) when a saccade target or a marker (spatially separated from the saccade landing point) was present, the compression pattern of mislocalization was significantly stronger than in conditions without them, for both black and picture background conditions, and (b) the mislocalization focus tended towards the salient stimulus regardless of whether it was the saccade target or the marker. Our results suggest that a salient stimulus presented in the scene may have an attracting effect and therefore contribute to the non-uniformity of saccadic mislocalization of a probing flash.

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Seeing and ballistic pointing at perisaccadic targets

Cited by 31 publications

References 63 publications

Temporal Information Can Influence Spatial Localization

Temporal Information Can Influence Spatial Localization

Depth perception during saccades

Salient stimulus attracts focus of peri-saccadic mislocalization

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