Transsaccadic integration of bystander locations

Germeys, Filip; Graef, Peter De; Panis, Sven; Eccelpoel, Caroline Van; Verfaillie, Karl

doi:10.1080/13506280344000301

Cited by 17 publications

(18 citation statements)

References 48 publications

(89 reference statements)

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“…This is in line with many studies showing that the spatial extent of transsaccadic memory is primarily focused on the saccade target region (Currie, McConkie, Carlson-Radvansky, & Irwin., 2000;Deubel et al, 1998;McConkie & Currie, 1996). However, since performance was well above chance level even for flanker objects, despite the small displacement sizes, the data also confirmed the findings of Verfaillie & De Graef (2000;see also De Graef, Verfaillie, & Lamote, 2001;Germeys, De Graef, Panis, Van Eccelpoel, & Verfaillie, 2004) that, given appropriate control for extrafoveal preview quality, transsaccadic memory for position information is not strictly limited to the saccade target region.…”

Section: Discussionsupporting

confidence: 77%

Transsaccadic Memory for the Position of Stationary and Translating Biologicalmotion Walkers

2011

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Previous research demonstrated an advantage for translating objects over stationary objects in transsaccadic displacement detection. However, in some studies, this benefit was absent. The current study was designed in order to clarify the basis of these contradictory findings. To this end, the procedure of an experiment with a clear motion benefit was combined with the stimuli of a study in which the motion benefit was absent. Participants saccaded towards either a stationary or a translating point-light walker and had to detect the intrasaccadic displacement of either the saccade target or the saccade flanker. Intrasaccadic displacements of the translating walker were found to be easier to detect than displacements of the stationary walker. Furthermore, displacements of the saccade target walker were better detected than displacements of the flanking walker. Implications for the previously contradictory observations are discussed and an explanation is proposed emphasising the differential importance of spatiotopic coding when a viewer is engaged in smooth object pursuit rather than having a stable fixation before making a saccade towards a translating object.

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Section: Discussionsupporting

confidence: 77%

Transsaccadic Memory for the Position of Stationary and Translating Biologicalmotion Walkers

2011

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“…Another important contribution emphasizing the role of landmarks for spatial localization has been provided by Germeys, De Graef, Panis, van Eccelpoel, & Verfaillie, (2004). These authors studied how well the locations of bystander objects, i.e., objects that are not the target of the saccade, are remembered across saccadic eye movements.…”

Section: Discussionmentioning

confidence: 99%

Localization of targets across saccades: Role of landmark objects

2004

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Saccadic eye movements are required to bring different parts of the visual world into the foveal region of the retina. With each saccade, the images of the objects drastically change their retinal positionsÐnevertheless, the visual world appears continuous and does not seem to jump. How does the visual system achieve this continuous and stable percept of the visual world, despite the gross changes of its retinal projection that occur with each saccade? The present paper argues that an important factor of this type of space constancy is formed by the reafferent information, i.e., the visual display that is found when the eyes land. Three experiments demonstrate that objects present across the saccade can serve as landmarks for postsaccadic relocalization. The basic experimental manipulation consisted of a systematic displacement of these landmark objects during the saccade. The effectiveness of the landmarks was determined by analysing to what degree they modify the perceived shift of a small saccade target that was blanked for 200 ms during and after the saccade. A first experiment studied the spatial range where objects become effective as landmarks. The data show that landmarks close to the saccade target and horizontally aligned with the target are specifically effective. The second experiment demonstrates that postsaccadic localization is normally based on relational information about relative stimulus positions transferred across the saccade. A third experiment studied the effect of a prominent background frame on transsaccadic localization; the results suggest that background structures contribute only little to transsaccadic localization.

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“…One advantage of using allocentric cues in the maintenance of spatial constancy across saccades is that the relative positions of objects do not tend to change when the eyes move. Indeed, several studies have shown that when allocentric cues are available, trans-saccadic memory of a target object's position is encoded according to its relative spatial relationship to other stimuli in the environment [7,16,17]. This allocentric coding of a target's location in trans-saccadic memory has been shown to be superior to remembering a target's location when it is presented in isolation [18].…”

Section: Experimental Demonstrations Of Egocentric Mechanisms For Tspmentioning

confidence: 99%

“…Allocentric cues are used to derive an object's location by its relative position to other objects in the world, independent of the observer. Space constancy across saccades could be maintained by matching pre-and post-saccadic allocentric information from the visual scene while the attributes of the saccade itself are disregarded [5][6][7][8]. However, one problem with allocentric mechanisms is that they require a certain amount of visual processing time after the saccade [9], whereas optimal TSP would be instantaneous, or even predictive.…”

Section: Solving the Space Constancy Problemmentioning

confidence: 99%

Cortical mechanisms for trans-saccadic memory and integration of multiple object features

Prime

Vesia

Crawford

2011

Phil. Trans. R. Soc. B

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Constructing an internal representation of the world from successive visual fixations, i.e. separated by saccadic eye movements, is known as trans-saccadic perception. Research on trans-saccadic perception (TSP) has been traditionally aimed at resolving the problems of memory capacity and visual integration across saccades. In this paper, we review this literature on TSP with a focus on research showing that egocentric measures of the saccadic eye movement can be used to integrate simple object features across saccades, and that the memory capacity for items retained across saccades, like visual working memory, is restricted to about three to four items. We also review recent transcranial magnetic stimulation experiments which suggest that the right parietal eye field and frontal eye fields play a key functional role in spatial updating of objects in TSP. We conclude by speculating on possible cortical mechanisms for governing egocentric spatial updating of multiple objects in TSP.

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Transsaccadic integration of bystander locations

Cited by 17 publications

References 48 publications

Transsaccadic Memory for the Position of Stationary and Translating Biologicalmotion Walkers

Transsaccadic Memory for the Position of Stationary and Translating Biologicalmotion Walkers

Localization of targets across saccades: Role of landmark objects

Cortical mechanisms for trans-saccadic memory and integration of multiple object features

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