Pre- and post-saccadic stimulus timing in saccadic suppression of displacement – A computational model

Ziesche, Arnold; Bergelt, Julia; Deubel, Heiner; Hamker, Fred H.

doi:10.1016/j.visres.2017.06.007

Cited by 17 publications

(18 citation statements)

References 37 publications

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“…If the discrepancy is large, integration does not occur and the assumption of object constancy is discarded 17 . While previous models were able to explain saccadic suppression of displacement, but not the effect of target blanking, this was achieved in a recent computational model which took into account the neurophysiology of the visual system 18 , 19 . This model posits that under normal viewing circumstances pre- and post-saccadic information are recurrently integrated.…”

Section: Introductionmentioning

confidence: 99%

Distractor displacements during saccades are reflected in the time-course of saccade curvature

Leeuwen

Belopolsky

2018

Sci Rep

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Every time we make a saccade we form a prediction about where objects are going to be when the eye lands. This is crucial since the oculomotor system is retinotopically organized and every saccade drastically changes the projection of objects on the retina. We investigated how quickly the oculomotor system accommodates new spatial information when a distractor is displaced during a saccade. Participants performed sequences of horizontal and vertical saccades and oculomotor competition was induced by presenting a task-irrelevant distractor before the first saccade. On half of the trials the distractor remained in the same location after the first saccade and on the other half the distractor moved during the first saccade. Curvature of the second saccade was used to track target-distractor competition. At short intersaccadic intervals, saccades curved away from the original distractor location, confirming that in the oculomotor system spatiotopic representations emerge rapidly and automatically. Approximately 190 ms after the first saccade, second saccades curved away from the new distractor location. These results show that after a saccade the oculomotor system is initially driven by the spatial prediction made before the saccade, but it is able to quickly update these spatial predictions based on new visual information.

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Section: Introductionmentioning

confidence: 99%

Distractor displacements during saccades are reflected in the time-course of saccade curvature

Leeuwen

Belopolsky

2018

Sci Rep

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“…Since previous simulations with the 1D model version indicate that mislocalization in total darkness around saccade and saccadic suppression of displacement also can be accounted for by the same neural circuits (Ziesche & Hamker, 2011Ziesche et al, 2017) and as the 1D version of this model was designed prior to the observation of updating of attention, from the models point of view this observation can be considered an inherent prediction.…”

Section: Discussionmentioning

confidence: 99%

“…No such information exists in humans. Our parameters are based on previous versions of the model (Ziesche & Hamker, 2011Ziesche et al, 2017) and mainly motivated to account for human behavioral data. Second, there is some variation in experimental studies regarding the dominance of the effects in the data which requires future clarifications.…”

Section: Discussionmentioning

confidence: 99%

“…The model accounts for predictive remapping using two eye position related signals, a discrete eye position signal and a corollary discharge signal, to compute the perceived position of stimuli across saccades. Ziesche and colleagues demonstrated the model is in addition able to explain the perisaccadic mislocalization of briefly flashed stimuli in complete darkness (Ziesche & Hamker, 2011) and the observation of saccadic suppression of displacement (SSD) (Ziesche & Hamker, 2014;Ziesche, Bergelt, Deubel, & Hamker, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Spatial updating of attention across eye movements: A neuro-computational approach

Bergelt

Hamker

2018

Preprint

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While scanning our environment, the retinal image changes with every saccade. Nevertheless, the visual system anticipates where an attended target will be next and attention is updated to the new location. Recently, two different types of perisaccadic attentional updates were discovered: Predictive remapping of attention before saccade onset (Rolfs, Jonikaitis, Deubel, & Cavanagh, 2011) as well as lingering of attention after saccade (Golomb, Chun, & Mazer, 2008;Golomb, Pulido, Albrecht, Chun, & Mazer, 2010). We here propose a neurocomputational model located in LIP based on a previous model of perisaccadic space perception (Ziesche & Hamker, 2011. Our model can account for both types of updating of attention at a neural systems level. The lingering effect originates from the late updating of the proprioceptive eye position signal and the remapping from the early corollary discharge signal. We put these results in relationship to predictive remapping of receptive fields and show that both phenomena arise from the same simple, recurrent neural circuit. Thus, together with the previously published results, the model provides a comprehensive framework to discuss multiple experimental observations that occur around saccades.

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“…Further, they demonstrated that saccade-as well as mask-induced suppression of displacement is reduced when the pre-saccadic target is shown for a longer period of time before it is displaced. Others hypothesized that saccades, as well as masks, may lead to temporary distortions in the incoming position signal of the post-saccadic or post-mask target [44]. If the re-appearance of the target after the saccade or mask is delayed, though, the processes responsible for the distortions have already ceased and thus do not hamper displacement perception anymore.…”

Section: Improvement With Blanking: Relaxed Bias or Better Evidence?mentioning

confidence: 99%

Saccadic Suppression of Displacement Does Not Reflect a Saccade-Specific Bias to Assume Stability

Born

2019

Vision

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Across saccades, small displacements of a visual target are harder to detect and their directions more difficult to discriminate than during steady fixation. Prominent theories of this effect, known as saccadic suppression of displacement, propose that it is due to a bias to assume object stability across saccades. Recent studies comparing the saccadic effect to masking effects suggest that suppression of displacement is not saccade-specific. Further evidence for this account is presented from two experiments where participants judged the size of displacements on a continuous scale in saccade and mask conditions, with and without blanking. Saccades and masks both reduced the proportion of correctly perceived displacements and increased the proportion of missed displacements. Blanking improved performance in both conditions by reducing the proportion of missed displacements. Thus, if suppression of displacement reflects a bias for stability, it is not a saccade-specific bias, but a more general stability assumption revealed under conditions of impoverished vision. Specifically, I discuss the potentially decisive role of motion or other transient signals for displacement perception. Without transients or motion, the quality of relative position signals is poor, and saccadic and mask-induced suppression of displacement reflects performance when the decision has to be made on these signals alone. Blanking may improve those position signals by providing a transient onset or a longer time to encode the pre-saccadic target position.

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Pre- and post-saccadic stimulus timing in saccadic suppression of displacement – A computational model

Cited by 17 publications

References 37 publications

Distractor displacements during saccades are reflected in the time-course of saccade curvature

Distractor displacements during saccades are reflected in the time-course of saccade curvature

Spatial updating of attention across eye movements: A neuro-computational approach

Saccadic Suppression of Displacement Does Not Reflect a Saccade-Specific Bias to Assume Stability

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