JNER: The effect of visuospatial perception on distance judgment and depth perception in patients with stroke in an augmented reality environment: an exploratory study

Visual Spatial Perception (VSP) is the ability to correctly perceive the physical position of an object relative to its own body and recognize the physical relationship between different objects
.

Specifically, VSP describes the interpretation of object size, shape, position, and movement

It is defined as the ability to visually perceive a three-dimensional (3D) world and estimate the distance of an object

The processing approach of visual spatial information starts with the projection of the visual field on the retina of both eyes

After a stroke, the brain tissue is damaged due to hypoxia, and the nerve structure of the survivor is usually damaged, which has an impact on VSP
.

The patient showed difficulty in orientation and attention in the contralateral space

In addition to perceptual difficulties, stroke survivors are also affected by eye movement disorders such as gaze paralysis, strabismus, and nystagmus

Augmented reality (AR), virtual reality (VR) and active video games are used as neurorehabilitation devices

In order to fill this gap in the literature, this article conducted a research on "SPiAR Spatial Perception in Augmented Reality"
.

In order to compare the VSP damage and depth perception during the application of AR, the stereo vision and spatial perception of patients and healthy subjects (HS) after stroke in the real environment and AR environment were evaluated

This article was published in " Journal of NeuroEngineering and Rehabilitation "

The purpose of this study is to investigate the effect of VSP injury on the ability to perceive depth during AR application in patients after stroke
.

In the design of exploratory research, stereo vision and spatial perception in real and AR environments were evaluated

Three distance judgment tasks and one three-dimensional task are designed

experiment process

experiment process

In HS, stereo vision has a significant impact on the performance of all AR distance judgment tasks (p=0.
021, p=0.
002, p=0.
046) and three-dimensional tasks (p=0.
003)
.

The individual quality of stereo vision significantly predicts the accuracy of each distance judgment task, and is highly correlated with the three-dimensional perception ability of the hologram (p=0.

In HS, stereo vision has a significant impact on the performance of all AR distance judgment tasks (p=0.
021, p=0.
002, p=0.
046) and three-dimensional tasks (p=0.
003)
.

The task of assessing the ability to judge distance

In short, because of the existence of stereo vision, the stereo vision quality of HS will also affect the distance judgment ability of the hologram and its 3D perception ability, while the spatial positioning/visual construction has no effect on task performance
.
Based on this finding, it is assumed that the developed AR task is effective in evaluating stereo vision
.
In post-stroke patients, impaired stereo vision can affect one of the three distance estimation tasks
.
Although the quality of stereo vision cannot significantly predict the ability to accurately determine distance in an AR environment, spatial positioning/visual construction can significantly predict the performance of distance estimation test geometry
.
The patient's ability to view holograms as 3D is neither affected by VSP, nor is it related to any aspect of VSP
.

However, the spatial positioning/visual construction can significantly predict the performance of the distance estimation test geometry
.
The patient's ability to view holograms as 3D is neither affected by VSP, nor is it related to any aspect of VSP
.

VSP damage reduces the ability to estimate distance and perceive three-dimensionality in an AR environment
.
Stereo vision is the key to completing tasks for HS patients, and spatial positioning/visual construction dominates the patients
.
Because of VSP damage after a stroke, these findings may be critical when AR is used in neurorehabilitation
.
In order to maximize the treatment effect, the design of AR games should be suitable for VSP-impaired patients
.

The spatial positioning/visual construction dominates the patients
.
Because of VSP damage after a stroke, these findings may be critical when AR is used in neurorehabilitation
.
In order to maximize the treatment effect, the design of AR games should be suitable for VSP-impaired patients
.

Höhler, C.
, Rasamoel, ND, Rohrbach, N.
  et al.
 T he impact of visuospatial perception on distance judgment and depth perception in an Augmented Reality environment in patients after stroke: an exploratory study .
  J NeuroEngineering Rehabil  18, 127 (2021 ).
https://doi.
org/10.
1186/s12984-021-00920-5

et al.
he impact of visuospatial perception on distance judgment and depth perception in an Augmented Reality environment in patients after stroke: an exploratory study J NeuroEngineering Rehabil https://doi.
org/10.
1186/s12984-021-00920-5 

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