Background visual cues and memory-guided reaching

Krigolson, Olav; Heath, Matthew

doi:10.1016/j.humov.2004.10.011

Cited by 84 publications

(81 citation statements)

References 44 publications

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“…This system consisted of a flat, translucent screen suspended directly in the front of the subject on which small circular (1-cm-diameter) targets were projected from behind the screen. The screen was sufficiently large so as to limit the use of visual background information during matching (Krigolson and Heath 2004;Lemay et al 2004). The position of the targets and fixation point were software adjusted to be along the sightline of a laser pointer fixed to the distal end of the manipulandum just below eye level.…”

Section: Methodsmentioning

confidence: 99%

Upper Limb Asymmetries in the Matching of Proprioceptive Versus Visual Targets

Goble

Brown²

2008

Journal of Neurophysiology

138

111

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Section: Methodsmentioning

confidence: 99%

Upper Limb Asymmetries in the Matching of Proprioceptive Versus Visual Targets

Goble

Brown²

2008

Journal of Neurophysiology

138

111

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“…For example, visual landmarks provided during target presentation lead to an increase in accuracy and precision of reaching movements (Krigolson and Heath, 2004; Obhi and Goodale, 2005; Krigolson et al, 2007). The effect of reduced reach endpoint variability was even more pronounced when the landmarks were placed close to the reach target (Krigolson et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Integration of egocentric and allocentric information during memory-guided reaching to images of a natural environment

Fiehler

Wolf

Klinghammer

et al. 2014

Front. Hum. Neurosci.

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When interacting with our environment we generally make use of egocentric and allocentric object information by coding object positions relative to the observer or relative to the environment, respectively. Bayesian theories suggest that the brain integrates both sources of information optimally for perception and action. However, experimental evidence for egocentric and allocentric integration is sparse and has only been studied using abstract stimuli lacking ecological relevance. Here, we investigated the use of egocentric and allocentric information during memory-guided reaching to images of naturalistic scenes. Participants encoded a breakfast scene containing six objects on a table (local objects) and three objects in the environment (global objects). After a 2 s delay, a visual test scene reappeared for 1 s in which 1 local object was missing (= target) and of the remaining, 1, 3 or 5 local objects or one of the global objects were shifted to the left or to the right. The offset of the test scene prompted participants to reach to the target as precisely as possible. Only local objects served as potential reach targets and thus were task-relevant. When shifting objects we predicted accurate reaching if participants only used egocentric coding of object position and systematic shifts of reach endpoints if allocentric information were used for movement planning. We found that reaching movements were largely affected by allocentric shifts showing an increase in endpoint errors in the direction of object shifts with the number of local objects shifted. No effect occurred when one local or one global object was shifted. Our findings suggest that allocentric cues are indeed used by the brain for memory-guided reaching towards targets in naturalistic visual scenes. Moreover, the integration of egocentric and allocentric object information seems to depend on the extent of changes in the scene.

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“…The main difference between our task and that of Thompson and Henriques was that they used reaching movements, whereas in the present study, saccadic eye movements were used. This is, however, not a likely explanation for the difference in results, because consistent with studies on saccades, several studies have shown that reaching movements to visual targets are more accurate and/or precise when object-centered information is available (Conti & Beaubaton, 1980;Hay & Redon, 2006;Krigolson & Heath, 2004;Lemay, Bertram, & Stelmach, 2004;Obhi & Goodale, 2005;Schütz et al, 2013).…”

Section: Discussionmentioning

confidence: 72%

Contributions of gaze-centered and object-centered coding in a double-step saccade task

Brouwer

Medendorp

Smeets³

2016

Journal of Vision

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The position of a saccade target can be encoded in gazecentered coordinates, that is, relative to the current gaze position, or in object-centered coordinates, that is, relative to an object in the environment. We tested the role of gaze-centered and object-centered coding in a double-step saccade task involving the Brentano version of the Müller-Lyer illusion. The two visual targets were presented either sequentially, requiring gaze-centered coding of the second saccade target, or simultaneously, thereby providing additional object-centered information about the location of the second target relative to the first. We found that the endpoint of the second saccade was affected by the illusion, irrespective of whether the targets were presented sequentially or simultaneously, suggesting that participants used a gazecentered updating strategy. We found that variability in saccade endpoints was reduced when object-centered information was consistently available but not when its presence varied from trial to trial. Our results suggest that gaze-centered coding is dominant in the planning of sequential saccades, whereas object-centered information plays a relatively small role.

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Background visual cues and memory-guided reaching

Cited by 84 publications

References 44 publications

Upper Limb Asymmetries in the Matching of Proprioceptive Versus Visual Targets

Upper Limb Asymmetries in the Matching of Proprioceptive Versus Visual Targets

Integration of egocentric and allocentric information during memory-guided reaching to images of a natural environment

Contributions of gaze-centered and object-centered coding in a double-step saccade task

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