Perception of Visual Space at the Time of Pro- and Anti-Saccades

Awater, Holger; Lappe, Markus

doi:10.1152/jn.00821.2003

Cited by 37 publications

(35 citation statements)

References 35 publications

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“…All these erroneous trials were discarded for the rest of the study. The mean saccadic latency computed over all subjects was significantly shorter for prosaccades than that for antisaccades, in agreement with previous studies (Awater and Lappe 2004;Brown et al 2006;Dafoe et al 2007;Everling and Fischer 1998;Seidlits et al 2003). In addition, we found that prosaccades reached a significantly faster peak velocity than antisaccades.…”

Section: General Observationssupporting

confidence: 92%

Behavioral Evidence of Separate Adaptation Mechanisms Controlling Saccade Amplitude Lengthening and Shortening

Panouillères¹,

Weiss²,

Urquizar³

et al. 2009

Journal of Neurophysiology

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Panouillères M, Weiss T, Urquizar C, Salemme R, Munoz DP, Pélisson D. Behavioral evidence of separate adaptation mechanisms controlling saccade amplitude lengthening and shortening. J Neurophysiol 101: 1550 -1559, 2009. First published December 17, 2008 doi:10.1152/jn.90988.2008. The accuracy of saccadic eye movements is maintained over the long term by adaptation mechanisms that decrease or increase saccade amplitude. It is still unknown whether these opposite adaptive changes rely on common mechanisms. Here, a double-step target paradigm was used to adaptively decrease (backward second target step) or increase (forward step) the amplitude of reactive saccades in one direction only. To test which sensorimotor transformation stages are subjected to these adaptive changes, we measured their transfer to antisaccades in which sensory and motor vectors are spatially dissociated. In the backward adaptation condition, all subjects showed a significant amplitude decrease for adapted prosaccades and a significant transfer of adaptation to antisaccades performed in the adapted direction, but not to oppositely directed antisaccades elicited by a target jump in the adapted direction. In the forward adaptation condition, only 14 of 19 subjects showed a significant amplitude increase for prosaccades and no significant adaptation transfer to antisaccades was detected in either the adapted or nonadapted direction. These findings suggest that, whereas the level(s) of forward adaptation cannot be resolved, the mechanisms involved in backward adaptation of reactive saccades take place at a sensorimotor level downstream from the vector inversion process of antisaccades and differ markedly from those involved in forward adaptation.

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Section: General Observationssupporting

confidence: 92%

Behavioral Evidence of Separate Adaptation Mechanisms Controlling Saccade Amplitude Lengthening and Shortening

Panouillères¹,

Weiss²,

Urquizar³

et al. 2009

Journal of Neurophysiology

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“…Note however, that in comparison to the findings of Morrone et al (1997) with real saccades, the localization bias toward the peripheral target is less pronounced for simulated saccades in our study. Since space compression also tended to be weaker in our real saccade task, different stimulus parameters, such as luminance (Awater and Lappe, 2004), contrast level (Michels and Lappe, 2004) and spatial frequency of the flashed stimulus may primarily account for this difference. Further experiments probing mislocalization shortly before real and simulated saccades with a parametric modulation of these factors are required to resolve the difference.…”

Section: Discussionmentioning

confidence: 88%

Perisaccadic mislocalization without saccadic eye movements

et al. 2006

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Abstract-Despite frequent saccadic gaze shifts we perceive the surrounding visual world as stable. It has been proposed that the brain uses extraretinal eye position signals to cancel out saccade-induced retinal image motion. Nevertheless, stimuli flashed briefly around the onset of a saccade are grossly mislocalized, resulting in a shift and, under certain conditions, an additional compression of visual space. Perisaccadic mislocalization has been related to a spatio-temporal misalignment of an extraretinal eye position signal with the corresponding saccade. Here, we investigated perceptual mislocalization of human observers both in saccade and fixation conditions. In the latter conditions, the retinal stimulation during saccadic eye movements was simulated by a fast saccade-like shift of the stimulus display. We show that the spatio-temporal pattern of both the shift and compression components of perceptual mislocalization can be surprisingly similar before real and simulated saccades. Our findings suggest that the full pattern of perisaccadic mislocalization can also occur in conditions which are unlikely to involve changes of an extraretinal eye position signal. Instead, we suggest that, under the conditions of our experiments, the arising difficulty to establish a stable percept of a briefly flashed stimulus within a given visual reference frame yields mislocalizations before fast retinal image motion. The availability of visual references appears to exert a major influence on the relative contributions of shift and compression components to mislocalization across the visual field. © 2005 Published by Elsevier Ltd on behalf of IBRO.

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“…Recently, Awater and Lappe (2004) reported that the same distortions of visual space are produced during anti-saccades as during pro-saccades. They attributed these distortions to the remapping process in parietal cortex, in accord with the present findings.…”

Section: Discussionmentioning

confidence: 94%

Remapping the Remembered Target Location for Anti-Saccades in Human Posterior Parietal Cortex

Medendorp¹,

Goltz²,

Vilis³

2005

Journal of Neurophysiology

115

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We used functional magnetic resonance imaging (fMRI) to investigate the role of the human posterior parietal cortex (PPC) in anti-saccades. To do so, we exploited the laterality of a subregion of the PPC for remembered target location. Using an event-related design, we tracked fMRI signal changes in this region while subjects remembered the location of a flashed target, then were instructed to plan either an anti- or pro-saccade to that location, and finally were instructed to execute the movement. At first, the region responded preferentially to the memory of a target location presented in the contralateral visual field. However, when an anti-cue specified a saccadic response into the opposite visual field, we observed a dynamic shift in cortical activity from one hemisphere to the other. This shows that this region within the human posterior parietal cortex codes the target location for an upcoming saccade, rather than the location of the remembered visual stimulus in an anti-saccade task.

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Perception of Visual Space at the Time of Pro- and Anti-Saccades

Cited by 37 publications

References 35 publications

Behavioral Evidence of Separate Adaptation Mechanisms Controlling Saccade Amplitude Lengthening and Shortening

Behavioral Evidence of Separate Adaptation Mechanisms Controlling Saccade Amplitude Lengthening and Shortening

Perisaccadic mislocalization without saccadic eye movements

Remapping the Remembered Target Location for Anti-Saccades in Human Posterior Parietal Cortex

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