Response delay and spatial representation in pointing movements

Hay, Laurette; Redon, Christine

doi:10.1016/j.neulet.2006.08.080

Cited by 42 publications

(33 citation statements)

References 20 publications

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“…Egocentric and allocentric representations of space are present in parallel and both types of information are usually used for more accurate behavior (Burgess, 2006; Byrne and Crawford, 2010). It has been shown that egocentric spatial memory is short lasting, putatively because it has to provide mainly real-time representation of the environment for direct interaction with objects (Hay and Redon, 2006; Chen et al, 2011). The fact that in previous task designs IRE was observed after a certain delay could be attributed to the interaction of short-lasting egocentric and long-lasting allocentric spatial representations.…”

Section: Discussionmentioning

confidence: 99%

Spatial task context makes short-latency reaches prone to induced Roelofs illusion

Taghizadeh

Gail

2014

Front. Hum. Neurosci.

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The perceptual localization of an object is often more prone to illusions than an immediate visuomotor action towards that object. The induced Roelofs effect (IRE) probes the illusory influence of task-irrelevant visual contextual stimuli on the processing of task-relevant visuospatial instructions during movement preparation. In the IRE, the position of a task-irrelevant visual object induces a shift in the localization of a visual target when subjects indicate the position of the target by verbal response, key-presses or delayed pointing to the target (“perception” tasks), but not when immediately pointing or reaching towards it without instructed delay (“action” tasks). This discrepancy was taken as evidence for the dual-visual-stream or perception-action hypothesis, but was later explained by a phasic distortion of the egocentric spatial reference frame which is centered on subjective straight-ahead (SSA) and used for reach planning. Both explanations critically depend on delayed movements to explain the IRE for action tasks. Here we ask: first, if the IRE can be observed for short-latency reaches; second, if the IRE in fact depends on a distorted egocentric frame of reference. Human subjects were tested in new versions of the IRE task in which the reach goal had to be localized with respect to another object, i.e., in an allocentric reference frame. First, we found an IRE even for immediate reaches in our allocentric task, but not for an otherwise similar egocentric control task. Second, the IRE depended on the position of the task-irrelevant frame relative to the reference object, not relative to SSA. We conclude that the IRE for reaching does not mandatorily depend on prolonged response delays, nor does it depend on motor planning in an egocentric reference frame. Instead, allocentric encoding of a movement goal is sufficient to make immediate reaches susceptible to IRE, underlining the context dependence of visuomotor illusions.

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Section: Discussionmentioning

confidence: 99%

Spatial task context makes short-latency reaches prone to induced Roelofs illusion

Taghizadeh

Gail

2014

Front. Hum. Neurosci.

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“…Reaches were performed immediately after the presentation of the test scene; a condition which is usually defined as immediate reaching (cf. Bridgeman et al, 2000; Hay and Redon, 2006). However, here we asked participants to reach to the missing object in the test scene which required to build up representations of potential reach targets during the encoding scene which were then updated on the basis of the test scene after a 2 s delay.…”

Section: Discussionmentioning

confidence: 99%

“…Delay is believed to have an important influence on spatial coding. For example, Hay and Redon (2006) found that delayed reaching accuracy declined in darkness but remained constant when a structured visual background was available. They explain their findings with a decaying egocentric representation and a more permanent allocentric representation of target location.…”

Section: Discussionmentioning

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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Response delay and spatial representation in pointing movements

Cited by 42 publications

References 20 publications

Spatial task context makes short-latency reaches prone to induced Roelofs illusion

Spatial task context makes short-latency reaches prone to induced Roelofs illusion

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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