Effect of Saccadic Adaptation on Localization of Visual Targets

Awater, Holger; Burr, David; Lappe, Markus; Morrone, Maria Concetta; Goldberg, Michael E.

doi:10.1152/jn.01013.2003

Cited by 86 publications

(91 citation statements)

References 36 publications

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“…The adaptation involves gain changes in cerebellar and other subcortical structures (Desmurget et al, 1998;Robinson and Fuchs, 2001;Catz et al, 2008;Golla et al, 2008). The adaptation-induced mislocalization suggests effects of adaptation on the cortical level, or at least feedback from cerebellar or subcortical structures onto cortical localization mechanisms (Gaymard et al, 2001;Awater et al, 2005).…”

Section: Methodsmentioning

confidence: 99%

“…Recent research has shown a reciprocal effect between visual localization and saccade targeting: modification of motor parameters by saccade adaptation leads to a distortion of visual localization (Bahcall and Kowler, 1999;Awater et al, 2005;Bruno and Morrone, 2007;Collins et al, 2007). This suggests that visual localization and saccade targeting share a common coordinate system, and common pathways in the brain, such that the signal that codes the required motor parameters to reach an object with a saccade also codes the perceived spatial position of that object.…”

Section: Introductionmentioning

confidence: 99%

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Mislocalization of Flashed and Stationary Visual Stimuli after Adaptation of Reactive and Scanning Saccades

Zimmermann¹,

Lappe²

2009

J. Neurosci.

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When we look around and register the location of visual objects, our oculomotor system continuously prepares targets for saccadic eye movements. The preparation of saccade targets may be directly involved in the perception of object location because modification of saccade amplitude by saccade adaptation leads to a distortion of the visual localization of briefly flashed spatial probes. Here, we investigated effects of adaptation on the localization of continuously visible objects. We compared adaptation-induced mislocalization of probes that were present for 20 ms during the saccade preparation period and of probes that were present for Ͼ1 s before saccade initiation. We studied the mislocalization of these probes for two different saccade types, reactive saccades to a suddenly appearing target and scanning saccades in the self-paced viewing of a stationary scene. Adaptation of reactive saccades induced mislocalization of flashed probes. Adaptation of scanning saccades induced in addition also mislocalization of stationary objects. The mislocalization occurred in the absence of visual landmarks and must therefore originate from the change in saccade motor parameters. After adaptation of one type of saccade, the saccade amplitude change and the mislocalization transferred only weakly to the other saccade type. Mislocalization of flashed and stationary probes thus followed the selectivity of saccade adaptation. Since the generation and adaptation of reactive and scanning saccades are known to involve partially different brain mechanisms, our results suggest that visual localization of objects in space is linked to saccade targeting at multiple sites in the brain.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mislocalization of Flashed and Stationary Visual Stimuli after Adaptation of Reactive and Scanning Saccades

Zimmermann¹,

Lappe²

2009

J. Neurosci.

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“…For example, compression correlates with eye speed such that higher speed results in stronger compression [22]. When visual target information and motor control are put into conflict, such as in anti-saccade [23] or saccadic adaptation [24,25] paradigms, compression occurs towards the motor endpoint.…”

Section: Perceptual and Physiological Phenomena Before And During Sacmentioning

confidence: 99%

“…As it stands, the model explains the above-mentioned effects in a retinocentric frame of reference. To account for effects for which transformations to other coordinate systems may play a role, like the observed compression towards the adapted saccade target position [24] or effects in total darkness [20], the model has to be extended in future studies.…”

Section: Theories and Computational Models Of Peri-and Trans-saccadicmentioning

confidence: 99%

Computational models of spatial updating in peri-saccadic perception

Hamker

Zirnsak

Ziesche

et al. 2011

Phil. Trans. R. Soc. B

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Perceptual phenomena that occur around the time of a saccade, such as peri-saccadic mislocalization or saccadic suppression of displacement, have often been linked to mechanisms of spatial stability. These phenomena are usually regarded as errors in processes of trans-saccadic spatial transformations and they provide important tools to study these processes. However, a true understanding of the underlying brain processes that participate in the preparation for a saccade and in the transfer of information across it requires a closer, more quantitative approach that links different perceptual phenomena with each other and with the functional requirements of ensuring spatial stability. We review a number of computational models of peri-saccadic spatial perception that provide steps in that direction. Although most models are concerned with only specific phenomena, some generalization and interconnection between them can be obtained from a comparison. Our analysis shows how different perceptual effects can coherently be brought together and linked back to neuronal mechanisms on the way to explaining vision across saccades.

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“…Saccade targeting can be adaptively adjusted by artificially displacing the saccade target while the eye moves (McLaughlin, 1967;Hopp and Fuchs, 2004;Pélisson et al, 2010). Oculomotor plasticity is paralleled by changes in visual localization that shift the apparent position of visual objects in space (Bahcall and Kowler, 1999;Awater et al, 2005;Bruno and Morrone, 2007;Collins et al, 2007). Saccadic adaptationinduced distortions of visual space have been found even during fixation, suggesting a common mechanism for saccade and visual targeting (Moidell and Bedell, 1988;Schnier et al, 2010;Zimmermann and Lappe, 2010).…”

Section: Introductionmentioning

confidence: 99%

Eye Position Effects in Oculomotor Plasticity and Visual Localization

Zimmermann

Lappe²

2011

J. Neurosci.

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For visual localization to remain accurate across changes of gaze, a signal representing the position of the eye in the orbita is needed to code spatial locations in a reference frame that is independent of retinal displacements. Here we report evidence that the localization of visual objects in space is coded in an extraretinal reference frame. In human subjects, we used outward saccadic adaptation, which can be induced artificially by a systematic displacement of the saccade target. This form of oculomotor plasticity is accompanied by changes in spatial perception, thus highlighting the relevance of saccade metrics for visual localization. We tested the reference frame of outward adaptation for reactive and scanning saccades and visual localization. For scanning saccades, adaptation magnitude was drastically reduced at positions distant from the adapted eye position. Changes in visual localization showed a very similar modulation of eye position. These results suggest that scanning saccade adaptation is encoded in a nonretinotopic reference frame. Eye position effects for reactive saccade adaptation were smaller, and the induced mislocalization did not vary significantly between eye positions. The different modulation of reactive and scanning saccade adaptation supports the idea that oculomotor plasticity can occur at multiple sites in the brain. The findings are also consistent with previous evidence for a stronger influence of scanning saccade adaptation on the visual localization of objects in space.

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Effect of Saccadic Adaptation on Localization of Visual Targets

Cited by 86 publications

References 36 publications

Mislocalization of Flashed and Stationary Visual Stimuli after Adaptation of Reactive and Scanning Saccades

Mislocalization of Flashed and Stationary Visual Stimuli after Adaptation of Reactive and Scanning Saccades

Computational models of spatial updating in peri-saccadic perception

Eye Position Effects in Oculomotor Plasticity and Visual Localization

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