Meta-analysis of the visuospatial aftereffects of prism adaptation, with two novel experiments

McIntosh, Robert D.; Brown, Bethany M.A.; Young, Louise

doi:10.1016/j.cortex.2018.11.013

Cited by 35 publications

(29 citation statements)

References 51 publications

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“…In the VR environment, longer lines required eye-movements to be perceived entirely, which may have interfered with or even canceled the adaptation effects by recalibrating the coordinates of the sensorymotor reference frame. We also found no transfer effects in the landmark task, which is in good agreement with previous reports suggesting that PA may affect visuomotor performance more than purely perceptual measure (Harvey et al, 1995;Gammeri et al, 2020;but see Ptak, 2017;McIntosh et al, 2019).…”

Section: Transfer Effects Of Adaptationsupporting

confidence: 93%

Visual but Not Auditory-Verbal Feedback Induces Aftereffects Following Adaptation to Virtual Prisms

et al. 2021

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Visuo-motor adaptation with optical prisms that displace the visual scene (prism adaptation, PA) has been widely used to study visuo-motor plasticity in healthy individuals and to decrease the lateralized bias of brain-damaged patients suffering from spatial neglect. Several factors may influence PA aftereffects, such as the degree of optical deviation (generally measured in dioptres of wedge prisms) or the direction of the prismatic shift (leftward vs. rightward). However, the mechanisms through which aftereffects of adaptation in healthy individuals and in neglect affect performance in tasks probing spatial cognition remain controversial. For example, some studies have reported positive effects of PA on auditory neglect, while other studies failed to obtain any changes of performance even in the visual modality. We here tested a new adaptation method in virtual reality to evaluate how sensory parameters influence PA aftereffects. Visual vs. auditory-verbal feedback of optical deviations were contrasted to assess whether rightward deviations influence manual and perceptual judgments in healthy individuals. Our results revealed that altered visual, but not altered auditory-verbal feedback induces aftereffects following adaptation to virtual prisms after 30-degrees of deviation. These findings refine current models of the mechanisms underlying the cognitive effects of virtual PA in emphasizing the importance of visual vs. auditory-verbal feedback during the adaptation phase on visuospatial judgments. Our study also specifies parameters which influence virtual PA and its aftereffect, such as the sensory modality used for the feedback.

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Section: Transfer Effects Of Adaptationsupporting

confidence: 93%

Visual but Not Auditory-Verbal Feedback Induces Aftereffects Following Adaptation to Virtual Prisms

et al. 2021

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“…The difference in performance at the two tasks can lie in the amount of variability present in the manual line bisection performance and its poor sensitivity (McCourt and Jewell, 1999;McCourt and Olafson, 1997) as compared to the Landmark task. The Landmark task is thought to minimize the motor component and be more sensitive to the perceptual one (Milner et al, 1992), providing finer quantification of visuospatial attention bias than manual line bisection (McIntosh et al, 2019). The greater amount of pseudoneglect observed with the Landmark task is the consequence of the elimination, minimization, and control of confounding factors such as the motor responses associated with the manual version of the line bisection (McCourt and Jewell, 1999;McCourt and Olafson, 1997).…”

Section: Discussionmentioning

confidence: 99%

Eye dominance modulates visuospatial attention

et al. 2020

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Visuospatial attention has an inherent asymmetry: the leftward bias called pseudoneglect. In typical line bisection tasks, healthy individuals tend to judge the center of a line leftward of the true center, an effect attributed to the right hemisphere dominance in visuospatial attention. Since it has been shown that information perceived by the dominant eye strongly activates the ipsilateral visual cortex, we hypothesized that eye dominance may modulate visuospatial attention bias. Because activation of the left hemisphere induced by left eye dominance should mitigate the right hemisphere dominance in attention, we predicted that right-handed individuals with left dominant eye would show smaller amount of pseudoneglect than right-handed individuals with right dominant eye. We compared the performance at both the perceptual (Landmark) and manual line bisection task of forty right-handed healthy individuals, half of whom had a right dominant eye and the other half a left dominant eye. As predicted, the left eyed dominant group showed smaller, actually not significant pseudoneglect, which was thus greater in the right eye dominant group. The influence of eye dominance on visuospatial attention was present in the Landmark but not the manual line bisection task, in which the amount of visuospatial bias correlated with participants' degree of (right) handedness. This is the first report of the effect of eye dominance on visuospatial attention within a right-handed population. This finding, by showing the influence of eye dominance on visuospatial cognition, not only helps in better defining intact visuospatial cognition mechanism but also encourages further research to pinpoint the neural basis of such interaction.

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“…Many studies have reported that leftward prism adaptation could reduce or even reverse the leftward bias ("pseudoneglect") in the line bisection task for heathy subjects (Colent et al, 2000;Michel et al, 2003;Schintu et al, 2014). In these studies, subjects were presented with a continuous line and were required to either mark the midpoint of a line manually (i.e., the manual line bisection task) or judge whether a pre-marked line is correctly bisected (i.e., the landmark task) (McIntosh et al, 2019). These results might provide evidence for the influence of PA on length perception.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies reported that leftward PA in healthy individuals induces neglect-like biases in visuospatial tasks (Colent et al, 2000;Michel et al, 2003;Loftus et al, 2009). For example, after adaptation to leftward-deviating prism, subjects tended to judge the midpoint of a line shifted toward right side of the true center in the line bisection task (Schintu et al, 2014;McIntosh et al, 2019). However, in these studies, subjects were required to either mark the midpoint of a line manually or judge whether a premarked line is correctly bisected.…”

Section: Introductionmentioning

confidence: 99%

How Does Attention Alter Length Perception? A Prism Adaptation Study

Cai

Yang

et al. 2020

Front. Psychol.

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How perceived size (length) of an object is influenced by attention is in debate. Prism adaptation (PA), as a type of sensory motor adaptation, has been shown to affect performance on a variety of spatial tasks in both neglect patient and healthy individuals. It has been hypothesized that PA's effects might be mediated by attentional mechanisms. In this study, we used PA to laterally shift spatial attention, and employed a precise psychophysical procedure to examine how the perceptual length of lines was influenced by this attentional shifting. Participants were presented with two separate lines in the left and right visual fields, and compared the length of the two lines. Forty-five healthy participants completed this line-length judgment task before and after a short period of adaptation to either left-(Experiment 1) or right-shifting (Experiment 2) prisms, or control goggles that did not shift the visual scene (Experiment 3). We found that participants initially tended to perceive the line presented in the left to be longer. This leftward bias of length perception was reduced by a short period of visuomotor adaptation to the left-deviating PA. However, for the right-shifting PA and plain glass goggles conditions, the initial length perception bias to the left line was unaffected. Mechanisms of this asymmetric effect of PA was discussed. Our results demonstrate that the length perception of a line can be influenced by a simple visuomotor adaptation, which might shift the spatial attention. This finding is consistent with the argument that attention can alter appearance.

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Meta-analysis of the visuospatial aftereffects of prism adaptation, with two novel experiments

Cited by 35 publications

References 51 publications

Visual but Not Auditory-Verbal Feedback Induces Aftereffects Following Adaptation to Virtual Prisms

Visual but Not Auditory-Verbal Feedback Induces Aftereffects Following Adaptation to Virtual Prisms

Eye dominance modulates visuospatial attention

How Does Attention Alter Length Perception? A Prism Adaptation Study

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