Allocentric information is used for memory-guided reaching in depth: A virtual reality study

Klinghammer, Mathias; Schütz, Immo; Blohm, Gunnar; Fiehler, Katja

doi:10.1016/j.visres.2016.10.004

Cited by 32 publications

(44 citation statements)

References 43 publications

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“…We replicated our previous findings (Fiehler et al, 2014;Klinghammer et al, 2015;Klinghammer et al, 2017;Klinghammer et al, 2016) showing that reaching trajectories and endpoints are systematically influenced by object shifts in the environment and that this influence increases with the number of shifted objects. The allocentric weights ranged from À0.13 to 0.44, indicating that reaching endpoints were affected by up to 44% by the object shifts.…”

Section: Discussionsupporting

confidence: 89%

“…Previous work from our group demonstrated that targets for memory-guided reaching are coded with respect to other objects in the environment, i.e., in an allocentric reference frame (Fiehler, Wolf, Klinghammer, & Blohm, 2014, Klinghammer, Blohm, & Fiehler, 2015Klinghammer, Blohm, & Fiehler, 2017;Klinghammer, Schütz, Blohm, & Fiehler, 2016). For example, in the study of Fiehler et al (2014), participants were presented with a naturalistic breakfast scene that contained six objects on a table (table objects) and three objects in the environment (background objects).…”

Section: Introductionmentioning

confidence: 99%

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The role of gaze and prior knowledge on allocentric coding of reach targets

Klinghammer

Fiehler

2018

Journal of Vision

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In this study, we investigated the influence of gaze and prior knowledge about the reach target on the use of allocentric information for memory-guided reaching. Participants viewed a breakfast scene with five objects in the background and six objects on the table. Table objects served as potential reach targets. Participants first encoded the scene and, after a short delay, a test scene was presented with one table object missing and one, three, or five table objects horizontally shifted in the same direction. Participants performed a memory-guided reaching movement toward the position of the missing object on a blank screen. In order to examine the influence of gaze, participants either freely moved their gaze (free-view) or kept gaze at a fixation point (fixation) throughout the trial. The effect of prior knowledge was investigated by informing participants about the reach target either before (preview) or after (nonpreview) scene encoding. Our results demonstrate that humans use allocentric information for reaching even if a stable retinal reference is available. However, allocentric coding of reach targets is stronger when gaze is free and prior knowledge about the reach target is missing.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

The role of gaze and prior knowledge on allocentric coding of reach targets

Klinghammer

Fiehler

2018

Journal of Vision

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“…This makes sense intuitively, since we have likely learned that objects that move do not make good landmarks. A more recent series of cue‐conflict studies looking at memory‐guided reach in naturalistic visual scenes with multiple allocentric objects has shown that allocentric weights may also depend on task relevancy of the allocentric cues …”

Section: Behavioral Aspects Of Landmark‐guided Reachingmentioning

confidence: 99%

“…A more recent series of cueconflict studies looking at memory-guided reach in naturalistic visual scenes with multiple allocentric objects has shown that allocentric weights may also depend on task relevancy of the allocentric cues. [46][47][48][49] Timing of the allocentric-to-egocentric transformation for action In order to use allocentric representations to aim reaches, they must somehow be transformed into egocentric commands for motion, that is, arm relative to shoulder. Does the visuomotor system wait until the last possible moment to perform this conversion, or does it do so at the first opportunity?…”

Section: Behavioral Aspects Of Landmark-guided Reachingmentioning

confidence: 99%

Allocentric representations for target memory and reaching in human cortex

Chen

Crawford

2019

Annals of the New York Academy of Sciences

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The use of allocentric cues for movement guidance is complex because it involves the integration of visual targets and independent landmarks and the conversion of this information into egocentric commands for action. Here, we focus on the mechanisms for encoding reach targets relative to visual landmarks in humans. First, we consider the behavioral results suggesting that both of these cues influence target memory, but are then transformed—at the first opportunity—into egocentric commands for action. We then consider the cortical mechanisms for these behaviors. We discuss different allocentric versus egocentric mechanisms for coding of target directional selectivity in memory (inferior temporal gyrus versus superior occipital gyrus) and distinguish these mechanisms from parieto‐frontal activation for planning egocentric direction of actual reach movements. Then, we consider where and how the former allocentric representations of remembered reach targets are converted into the latter egocentric plans. In particular, our recent neuroimaging study suggests that four areas in the parietal and frontal cortex (right precuneus, bilateral dorsal premotor cortex, and right presupplementary area) participate in this allo‐to‐ego conversion. Finally, we provide a functional overview describing how and why egocentric and landmark‐centered representations are segregated early in the visual system, but then reintegrated in the parieto‐frontal cortex for action.

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“…In order to study allocentric coding of reach targets in more naturalistic scenarios, recent work from our lab applied naturalistic 2D images of complex scenes (Fiehler et al, 2014; Klinghammer et al, 2015) or 3D virtual reality (Klinghammer et al, 2016). In these experiments, we presented naturalistic images of a breakfast scene containing multiple objects on a table and in the background.…”

Section: Introductionmentioning

confidence: 99%

Scene Configuration and Object Reliability Affect the Use of Allocentric Information for Memory-Guided Reaching

2017

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Previous research has shown that egocentric and allocentric information is used for coding target locations for memory-guided reaching movements. Especially, task-relevance determines the use of objects as allocentric cues. Here, we investigated the influence of scene configuration and object reliability as a function of task-relevance on allocentric coding for memory-guided reaching. For that purpose, we presented participants images of a naturalistic breakfast scene with five objects on a table and six objects in the background. Six of these objects served as potential reach-targets (= task-relevant objects). Participants explored the scene and after a short delay, a test scene appeared with one of the task-relevant objects missing, indicating the location of the reach target. After the test scene vanished, participants performed a memory-guided reaching movement toward the target location. Besides removing one object from the test scene, we also shifted the remaining task-relevant and/or task-irrelevant objects left- or rightwards either coherently in the same direction or incoherently in opposite directions. By varying object coherence, we manipulated the reliability of task-relevant and task-irrelevant objects in the scene. In order to examine the influence of scene configuration (distributed vs. grouped arrangement of task-relevant objects) on allocentric coding, we compared the present data with our previously published data set (Klinghammer et al., 2015). We found that reaching errors systematically deviated in the direction of object shifts, but only when the objects were task-relevant and their reliability was high. However, this effect was substantially reduced when task-relevant objects were distributed across the scene leading to a larger target-cue distance compared to a grouped configuration. No deviations of reach endpoints were observed in conditions with shifts of only task-irrelevant objects or with low object reliability irrespective of task-relevancy. Moreover, when solely task-relevant objects were shifted incoherently, the variability of reaching endpoints increased compared to coherent shifts of task-relevant objects. Our results suggest that the use of allocentric information for coding targets for memory-guided reaching depends on the scene configuration, in particular the average distance of the reach target to task-relevant objects, and the reliability of task-relevant allocentric information.

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Allocentric information is used for memory-guided reaching in depth: A virtual reality study

Cited by 32 publications

References 43 publications

The role of gaze and prior knowledge on allocentric coding of reach targets

The role of gaze and prior knowledge on allocentric coding of reach targets

Allocentric representations for target memory and reaching in human cortex

Scene Configuration and Object Reliability Affect the Use of Allocentric Information for Memory-Guided Reaching

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