Motor signals in visual localization

Zimmermann, Eckart; Lappe, Markus

doi:10.1167/10.6.2

Cited by 74 publications

(113 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this view, one may argue that localization judgments and saccade targeting share a common representation. This is also supported by findings that mislocalization also occurs during periods of fixation (Garaas and Pomplun 2011;Moidell and Bedell 1988;Schnier et al 2010;Zimmermann and Lappe 2010), suggesting that saccadic adaptation affects visual localization at the target registration or planning stages.…”

mentioning

confidence: 54%

“…This adjustment reduces the postsaccadic visual error during subsequent trials and allows the eyes to land closer to the shifted target. The effectiveness of saccadic adaptation depends on the location, timing, and consistency of the postsaccadic error (Collins et al 2009;Havermann and Lappe 2010;Noto and Robinson 2001;Panouilleres et al 2011;Shafer et al 2000;Wallman and Fuchs 1998;Zimmermann and Lappe 2010).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Mislocalization of stationary and flashed bars after saccadic inward and outward adaptation of reactive saccades

Schnier¹,

Lappe²

2012

Journal of Neurophysiology

View full text Add to dashboard Cite

Schnier F, Lappe M. Mislocalization of stationary and flashed bars after saccadic inward and outward adaptation of reactive saccades. J Neurophysiol 107: 3062-3070, 2012. First published March 21, 2012 doi:10.1152/jn.00877.2011.-Recent studies have shown that saccadic inward adaptation (i.e., the shortening of saccade amplitude) and saccadic outward adaptation (i.e., the lengthening of saccade amplitude) rely on partially different neuronal mechanisms. There is increasing evidence that these differences are based on differences at the target registration or planning stages since outward but not inward adaptation transfers to hand-pointing and perceptual localization of flashed targets. Furthermore, the transfer of reactive saccade adaptation to long-duration overlap and scanning saccades is stronger after saccadic outward adaptation than that after saccadic inward adaptation, suggesting that modulated target registration stages during outward adaptation are increasingly used in the execution of saccades when the saccade target is visually available for a longer time. The difference in target presentation duration between reactive and scanning saccades is also linked to a difference in perceptual localization of different targets. Flashed targets are mislocalized after inward adaptation of reactive and scanning saccades but targets that are presented for a longer time (stationary targets) are mislocalized stronger after scanning than after reactive saccades. This link between perceptual localization and adaptation specificity suggests that mislocalization of stationary bars should be higher after outward than that after inward adaptation of reactive saccades. In the present study we test this prediction. We show that the relative amount of mislocalization of stationary versus flashed bars is higher after outward than that after inward adaptation of reactive saccades. Furthermore, during fixation stationary and flashed bars were mislocalized after outward but not after inward adaptation. Thus, our results give further evidence for different adaptation mechanisms between inward and outward adaptation and harmonize some recent research.

show abstract

mentioning

confidence: 54%

mentioning

confidence: 99%

Mislocalization of stationary and flashed bars after saccadic inward and outward adaptation of reactive saccades

Schnier¹,

Lappe²

2012

Journal of Neurophysiology

View full text Add to dashboard Cite

show abstract

“…Several researches have demonstrated that the modification of motor variables by saccade adaptation leads to a distortion of visual localization of the target executed by hand pointing or by perceptual reports (Bahcall and Kowler, 1999;Awater et al, 2005;Bruno and Morrone, 2007;Collins et al, 2007, Zimmermann andLappe, 2010;Garaas and Pomplun, 2011;Gremmler et al, 2014). All these studies imply that localization of visual stimuli is based on a perceptual representation that is linked to an action representation that guides saccades and pointing.…”

Section: Introductionmentioning

confidence: 99%

Adaptation of Saccades and Perceived Size after Trans-Saccadic Changes of Object Size

2015

Self Cite

View full text Add to dashboard Cite

When saccadic eye movements consistently fail to land on the intended target, saccade accuracy is maintained by gradually adapting the amplitude of successive saccades to the same target. Such saccadic adaptation is usually induced by systematically displacing a small visual target during the execution of the saccade. However, saccades are normally performed to extended objects. Here we report changes in saccade amplitude when the size of a target object is systematically changed during a saccade. Moreover, we find that this manipulation also affected the visual perception of the size of that object. Human subjects were tested in shortening and lengthening adaptation where they had to make saccades to targets of different sizes, which were each shortened or lengthened during saccade execution, respectively. In both experiments, a preadaptation and postadaptation phase required manually indicating the horizontal size of each target by grip aperture and, in a further experiment, a verbal size report. We evaluated the effect of change in visual perception on saccade and on the two modalities of judgment. We observed that (1) saccadic adaptation can be induced by modifying target object size and (2) this gradual change in saccade amplitude in the direction of the object size change evokes a concomitant change in perceived object size. These findings suggest that size is a relevant signal for saccadic system and its trans-saccadic manipulation entails considerable changes at multiple levels of sensorimotor performance.

show abstract

“…The neural locus of saccade adaptation is not fully determined. In humans, differences in adaptation between saccade types (Deubel, 1995a;Alahyane et al, 2007;Cotti et al, 2007;Zimmermann and Lappe, 2009) and also between adaptation directions (Ethier et al, 2008;Panouillères et al, 2009;Zimmermann and Lappe, 2010) suggest that oculomotor plasticity can occur at multiple stages of the oculomotor system. Electrophysiological studies in monkeys, however, have found changes after saccade adaptation only in the oculomotor vermis of the cerebellum (Catz et al, 2008) and lower brainstem structures.…”

Section: Discussionmentioning

confidence: 99%

“…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). Modifications in saccade targeting must occur at multiple sites of the oculomotor pathways because different types of saccades (e.g., reactive or scanning saccades) show different adaptation behavior (Erkelens and Hulleman, 1993;Deubel, 1995a;Fujita et al, 2002;Collins and Doré-Mazars, 2006;Alahyane et al, 2007;Cotti et al, 2007;Zimmermann and Lappe, 2009).…”

Section: Introductionmentioning

confidence: 99%

Eye Position Effects in Oculomotor Plasticity and Visual Localization

Zimmermann

Lappe²

2011

J. Neurosci.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Motor signals in visual localization

Cited by 74 publications

References 39 publications

Mislocalization of stationary and flashed bars after saccadic inward and outward adaptation of reactive saccades

Mislocalization of stationary and flashed bars after saccadic inward and outward adaptation of reactive saccades

Adaptation of Saccades and Perceived Size after Trans-Saccadic Changes of Object Size

Eye Position Effects in Oculomotor Plasticity and Visual Localization

Contact Info

Product

Resources

About