Pointing movements may be produced in different frames of reference depending on the task demand

Ghafouri, Mohammad; Archambault, Philippe; Adamovich, Sergei V.; Feldman, Anatol G.

doi:10.1016/s0006-8993(01)03332-7

Cited by 34 publications

(28 citation statements)

References 56 publications

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“…When no visual cues are present in the immediate surrounding of the target, it has been previously proposed that pointing to a single remembered target is performed in an egocentric frame of reference. This has been shown for targets presented both in a lit environment (Chieffi, Allport, & Woodin, 1999;Lemay & Proteau, 2001;Soechting & Flanders, 1989a, b) as well as dark environments (Chieffi et al, 1999;Guafouri, Archambault, Adamovich, & Feldman, 2002;Soechting & Flanders, 1989a,b). In the present study, movement of the hand was either visible or not.…”

Section: Apparatus and Proceduresmentioning

confidence: 83%

Pointing to an Allocentric and Egocentric Remembered Target in Younger and Older Adults

Lemay

Bertram

Stelmach

2004

Experimental Aging Research

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Previous reports have shown that older adults have difficulties in maintaining allocentric information in memory but not egocentric information. The present study evaluated pointing accuracy in younger and older adults for egocentric and allocentric task. The task was to localize and maintain one, two, or four target locations. Target(s) were presented with or without a surrounding white square in a dimly lit environment. Despite previous postulations, the results of the present study revealed that older adults were able to point to remembered egocentric and allocentric targets as accurately as younger adults regardless of task difficulty. However, older adults took more time pointing to allocentric targets as compared to younger adults. The longer movement time was caused by a lengthening of the deceleration phase, suggesting that during pointing, older adults rely more on visual information surrounding the target than younger adults.

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Section: Apparatus and Proceduresmentioning

confidence: 83%

Pointing to an Allocentric and Egocentric Remembered Target in Younger and Older Adults

Lemay

Bertram

Stelmach

2004

Experimental Aging Research

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“…For instance, Ghafouri et al (2002) identified a radical switch between allocentric and egocentric references frames during fast arm pointing movements. In this task, subjects had to point either to a motionless target or to a target moving synchronously with the trunk.…”

Section: Interpenetrability Between Reference Framesmentioning

confidence: 99%

Influence of gaze elevation on estimating the possibility of passing under high obstacles during body tilt

2008

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We investigated the influence of gaze elevation on judging the possibility of passing under high obstacles during pitch body tilts, while stationary, in absence of allocentric cues. Specifically, we aimed at studying the influence of egocentric references upon geocentric judgements. Seated subjects, orientated at various body orientations, were asked to perceptually estimate the possibility of passing under a projected horizontal line while keeping their gaze on a fixation target and imagining a horizontal body displacement. The results showed a global overestimation of the possibility of passing under the line, and confirmed the influence of body orientation reported by Bringoux et al. (Exp Brain Res 185(4):673-680, 2008). More strikingly, a linear influence of gaze elevation was found on perceptual estimates. Precisely, downward eye elevation yielded increased overestimations, and conversely upward gaze elevation yielded decreased overestimations. Furthermore, body and gaze orientation effects were independent and combined additively to yield a global egocentric influence with a weight of 45 and 54%, respectively. Overall, our data suggest that multiple egocentric references can jointly affect the estimated possibility of passing under high obstacles. These results are discussed in terms of ''interpenetrability'' between geocentric and egocentric reference frames and clearly demonstrate that gaze elevation is involved, as body orientation, in geocentric spatial localization.

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“…A number of selection-related effects, such as negative priming (Shapiro & Loughlin, 1993) and inhibition of return (IOR, McAuliffe, Pratt, & O'Donnell, 2001;Tipper, Jordan, & Weaver, 1999;Tipper, Weaver, Jerreat, & Burak, 1994) have been shown to be coded in both location-and object-centered coordinate systems. Indeed, coding in multiple reference frames seems to be a common representational strategy (Danziger, Kingstone, & Ward, 2001;Ghafouri, Archambault, Adamovich, & Feldman, 2002;Lamy & Tsal, 2000).…”

Section: Introductionmentioning

confidence: 99%

Objects or locations in vision for action? Evidence from the MILO task

Horowitz

Thornton

2008

Visual Cognition

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In the multi-item localization task (MILO, Thornton & Horowitz, 2004), observers are asked to find an ordered sequence of targets. We can measure the influence of both past actions and future plans on search for the current target. Our previous work with static search arrays found evidence for both retrospective and prospective memory. Responding to a target eliminated its influence on subsequent responses, while observers consistently planned ahead at least one item into the future. Here we asked whether these effects were based in location-or object-based reference frames. We used dynamic arrays in which observers had to search for multiple moving targets. Our results suggest that observers can still plan ahead effectively in this dynamic environment, indicating that future target objects can be tracked as they change position. However, memory for previous targets is essentially eliminated, suggesting that locations, not objects, were being tagged in our previous work.

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Pointing movements may be produced in different frames of reference depending on the task demand

Cited by 34 publications

References 56 publications

Pointing to an Allocentric and Egocentric Remembered Target in Younger and Older Adults

Pointing to an Allocentric and Egocentric Remembered Target in Younger and Older Adults

Influence of gaze elevation on estimating the possibility of passing under high obstacles during body tilt

Objects or locations in vision for action? Evidence from the MILO task

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