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

Lu, Zijian; Klinghammer, Mathias; Fiehler, Katja

doi:10.1167/18.4.22

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…Further differences concern the relatively low number of potential allocentric cues and the a priori information about the action target. Yet, our results replicated previous findings showing that prior knowledge about the target object attenuates allocentric coding but does not cancel it out (Lu et al 2018 ). Lastly, the majority of studies in our field has been relying on upper limb movements to study the human visuomotor system.…”

Section: Discussionsupporting

confidence: 89%

The role of perception and action on the use of allocentric information in a large-scale virtual environment

2020

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In everyday life, our brain constantly builds spatial representations of the objects surrounding us. Many studies have investigated the nature of these spatial representations. It is well established that we use allocentric information in real-time and memory-guided movements. Most studies relied on small-scale and static experiments, leaving it unclear whether similar paradigms yield the same results on a larger scale using dynamic objects. We created a virtual reality task that required participants to encode the landing position of a virtual ball thrown by an avatar. Encoding differed in the nature of the task in that it was either purely perceptual (“view where the ball landed while standing still”—Experiment 1) or involved an action (“intercept the ball with the foot just before it lands”—Experiment 2). After encoding, participants were asked to place a real ball at the remembered landing position in the virtual scene. In some trials, we subtly shifted either the thrower or the midfield line on a soccer field to manipulate allocentric coding of the ball’s landing position. In both experiments, we were able to replicate classic findings from small-scale experiments and to generalize these results to different encoding tasks (perception vs. action) and response modes (reaching vs. walking-and-placing). Moreover, we found that participants preferably encoded the ball relative to the thrower when they had to intercept the ball, suggesting that the use of allocentric information is determined by the encoding task by enhancing task-relevant allocentric information. Our findings indicate that results previously obtained from memory-guided reaching are not restricted to small-scale movements, but generalize to whole-body movements in large-scale dynamic scenes.

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Section: Discussionsupporting

confidence: 89%

The role of perception and action on the use of allocentric information in a large-scale virtual environment

2020

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“…Hence allocentric coding is facilitated by task-relevant allocentric cues, whereas task-irrelevant cues are mostly ignored. Further facilitation has been shown when task-relevant objects are coherently shifted in the same direction or allowed for spatial clustering (Klinghammer et al, 2017), and when gaze was free compared with fixed in the center of the scene (Lu et al, 2018). It is important to note that stimuli in all of these studies were presented on a computer screen, that is, the objects were presented in pictorial space.…”

Section: Introductionmentioning

confidence: 98%

“…Although we can see the relative location of objects in the picture, we do not have a well-defined own location relative to these objects, emphasizing the role of allocentric reference frames in pictorial space. To probe for allocentric coding, Fiehler and colleagues (Fiehler, Wolf, Klinghammer, & Blohm, 2014;Klinghammer, Blohm, & Fiehler, 2015;Klinghammer, Blohm, & Fiehler, 2017;Lu, Klinghammer, & Fiehler, 2018) conducted a series of experiments in which participants were seated in front of a monitor and viewed pictures of a breakfast scene. After visual exploration of the scene (self-paced), the objects disappeared briefly before they reappeared again with one object missing (test scene).…”

Section: Introductionmentioning

confidence: 99%

Spatial coding for memory-guided reaching in visual and pictorial spaces

et al. 2020

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An essential difference between pictorial space displayed as paintings, photographs, or computer screens, and the visual space experienced in the real world is that the observer has a defined location, and thus valid information about distance and direction of objects, in the latter but not in the former. Thus egocentric information should be more reliable in visual space, whereas allocentric information should be more reliable in pictorial space. The majority of studies relied on pictorial representations (images on a computer screen), leaving it unclear whether the same coding mechanisms apply in visual space. Using a memory-guided reaching task in virtual reality, we investigated allocentric coding in both visual space (on a table in virtual reality) and pictorial space (on a monitor that is on the table in virtual reality). Our results suggest that the brain uses allocentric information to represent objects in both pictorial and visual space. Contrary to our hypothesis, the influence of allocentric cues was stronger in visual space than in pictorial space, also after controlling for retinal stimulus size, confounding allocentric cues, and differences in presentation depth. We discuss possible reasons for stronger allocentric coding in visual than in pictorial space.

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Spatial updating of allocentric landmark information in real-time and memory-guided reaching

Fiehler

2020

Cortex

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

Cited by 6 publications

References 35 publications

The role of perception and action on the use of allocentric information in a large-scale virtual environment

The role of perception and action on the use of allocentric information in a large-scale virtual environment

Spatial coding for memory-guided reaching in visual and pictorial spaces

Spatial updating of allocentric landmark information in real-time and memory-guided reaching

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