Enhancing Virtual Walking Sensation Using Self-Avatar in First-Person Perspective and Foot Vibrations

Walking is a fundamental physical activity in humans. Various virtual walking systems have been developed using treadmill or leg-support devices. Using optic flow, foot vibrations simulating footsteps, and a walking avatar, we propose a virtual walking system that does not require limb action for seated users. We aim to investigate whether a full-body or hands-and-feet-only walking avatar with either the first-person (experiment 1) or third-person (experiment 2) perspective can convey the sensation of walking in a virtual environment through optic flows and foot vibrations. The viewing direction of the virtual camera and the head of the full-body avatar were linked to the actual user's head motion. We discovered that the full-body avatar with the first-person perspective enhanced the sensations of walking, leg action, and telepresence, either through synchronous or asynchronous foot vibrations. Although the hands-and-feet-only avatar with the first-person perspective enhanced the walking sensation and telepresence, compared with the no-avatar condition, its effect was less prominent than that of the full-body avatar. However, the full-body avatar with the third-person perspective did not enhance the sensations of walking and leg action; rather, it impaired the sensations of self-motion and telepresence. Synchronous or rhythmic foot vibrations enhanced the sensations of self-motion, waking, leg action, and telepresence, irrespective of the avatar condition. These results suggest that the full-body or hands-and-feet avatar is effective for creating virtual walking experiences from the first-person perspective, but not the third-person perspective, and that the foot vibrations simulating footsteps are effective, regardless of the avatar condition.

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Motor Program Transformation of Throwing Dart from the Third-Person Perspective

Brain Sciences ◽

10.3390/brainsci10010055 ◽

2020 ◽

Vol 10 (1) ◽

pp. 55

Author(s):

Alexey Tumialis ◽

Alexey Smirnov ◽

Kirill Fadeev ◽

Tatiana Alikovskaia ◽

Pavel Khoroshikh ◽

...

Keyword(s):

Peak Velocity ◽

Motor Program ◽

First Person ◽

Head Mounted Display ◽

The Third ◽

Person Perspective ◽

Third Person ◽

First Person Perspective ◽

Third Person Perspective ◽

The Third Person

The perspective of perceiving one’s action affects its speed and accuracy. In the present study, we investigated the change in accuracy and kinematics when subjects throw darts from the first-person perspective and the third-person perspective with varying angles of view. To model the third-person perspective, subjects were looking at themselves as well as the scene through the virtual reality head-mounted display (VR HMD). The scene was supplied by a video feed from the camera located to the up and 0, 20 and 40 degrees to the right behind the subjects. The 28 subjects wore a motion capture suit to register their right hand displacement, velocity and acceleration, as well as torso rotation during the dart throws. The results indicated that mean accuracy shifted in opposite direction with the changes of camera location in vertical axis and in congruent direction in horizontal axis. Kinematic data revealed a smaller angle of torso rotation to the left in all third-person perspective conditions before and during the throw. The amplitude, speed and acceleration in third-person condition were lower compared to the first-person view condition, before the peak velocity of the hand in the direction toward the target and after the peak velocity in lowering the hand. Moreover, the hand movement angle was smaller in the third-person perspective conditions with 20 and 40 angle of view, compared with the first-person perspective condition just preceding the time of peak velocity, and the difference between conditions predicted the changes in mean accuracy of the throws. Thus, the results of this study revealed that subject’s localization contributed to the transformation of the motor program.

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Effects of Avatar Perspective on Joint Excursions Used to Play Virtual Dodgeball: Within-Subject Comparative Study

JMIR Serious Games ◽

10.2196/18888 ◽

2020 ◽

Vol 8 (3) ◽

pp. e18888

Author(s):

Susanne M van der Veen ◽

Alexander Stamenkovic ◽

Megan E Applegate ◽

Samuel T Leitkam ◽

Christopher R France ◽

...

Keyword(s):

Virtual Reality ◽

Repeated Measures ◽

First Person ◽

Head Mounted Display ◽

The Third ◽

Person Perspective ◽

Third Person ◽

First Person Perspective ◽

Third Person Perspective ◽

The Third Person

Background Visual representation of oneself is likely to affect movement patterns. Prior work in virtual dodgeball showed greater excursion of the ankles, knees, hips, spine, and shoulder occurs when presented in the first-person perspective compared to the third-person perspective. However, the mode of presentation differed between the two conditions such that a head-mounted display was used to present the avatar in the first-person perspective, but a 3D television (3DTV) display was used to present the avatar in the third-person. Thus, it is unknown whether changes in joint excursions are driven by the visual display (head-mounted display versus 3DTV) or avatar perspective during virtual gameplay. Objective This study aimed to determine the influence of avatar perspective on joint excursion in healthy individuals playing virtual dodgeball using a head-mounted display. Methods Participants (n=29, 15 male, 14 female) performed full-body movements to intercept launched virtual targets presented in a game of virtual dodgeball using a head-mounted display. Two avatar perspectives were compared during each session of gameplay. A first-person perspective was created by placing the center of the displayed content at the bridge of the participant’s nose, while a third-person perspective was created by placing the camera view at the participant’s eye level but set 1 m behind the participant avatar. During gameplay, virtual dodgeballs were launched at a consistent velocity of 30 m/s to one of nine locations determined by a combination of three different intended impact heights and three different directions (left, center, or right) based on subject anthropometrics. Joint kinematics and angular excursions of the ankles, knees, hips, lumbar spine, elbows, and shoulders were assessed. Results The change in joint excursions from initial posture to the interception of the virtual dodgeball were averaged across trials. Separate repeated-measures ANOVAs revealed greater excursions of the ankle (P=.010), knee (P=.001), hip (P=.0014), spine (P=.001), and shoulder (P=.001) joints while playing virtual dodgeball in the first versus third-person perspective. Aligning with the expectations, there was a significant effect of impact height on joint excursions. Conclusions As clinicians develop treatment strategies in virtual reality to shape motion in orthopedic populations, it is important to be aware that changes in avatar perspective can significantly influence motor behavior. These data are important for the development of virtual reality assessment and treatment tools that are becoming increasingly practical for home and clinic-based rehabilitation.

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Selbstwissen: Die Grundidee

Deutsche Zeitschrift für Philosophie ◽

10.1515/dzph-2015-0048 ◽

2015 ◽

Vol 63 (4) ◽

Author(s):

Richard Moran

Keyword(s):

Daily Life ◽

First Person ◽

Object A ◽

The Third ◽

Person Perspective ◽

Third Person ◽

Self Knowledge ◽

First Person Perspective ◽

Third Person Perspective ◽

The Third Person

AbstractIn philosophy it is widely recognized that a person’s first-person perspective on his own thought and action is importantly different from the third-person perspective we may have on the thought and actions of other people. In daily life it is natural to ask someone what he is doing or what he thinks about something, on the assumption that he knows what he is doing or what he is thinking. Some philosophers, however, argue that it is impossible to speak of knowledge in this context because the idea of knowledge requires a kind of distance between subject and object, a distance that is not present in the first-person context. I argue that this denial of self-knowledge is a paradoxical conclusion that we can resist, while retaining what is distinctive about the first-person.

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Social Space and the Question of Objectivity / Der soziale Raum und die Frage nach der Objektivität

Gestalt Theory ◽

10.1515/gth-2017-0018 ◽

2017 ◽

Vol 39 (2-3) ◽

pp. 249-262

Author(s):

James Mensch

Keyword(s):

Social Space ◽

First Person ◽

Social Dimensions ◽

The Third ◽

Person Perspective ◽

The Social ◽

Third Person ◽

First Person Perspective ◽

Third Person Perspective ◽

The Third Person

Summary In speaking of the social dimensions of human experience, we inevitably become involved in the debate regarding how they are to be studied. Should we embrace the first-person perspective, which is that of the phenomenologists, and begin with the experiences composing our directly experienced lifeworld? Alternately, should we follow the lead of natural scientists and take up the third-person perspective? This is the perspective that asserts that we must begin with what is true for everyone, i.e., with what is available to both me and Others (the “they” that forms the grammatical third person). Both perspectives are one sided in that each presupposes the other for its intelligibility. The third-person perspective is Cartesian and, as I show, privileges space, while the first-person perspective is social in Levinas’s sense and presupposes time. Our reality, I argue, embraces both perspectives and is, in fact, set by their intertwining.

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Level-1 Visual Perspective Taking Performance in People with High Narcissistic Traits

10.21203/rs.3.rs-882601/v1 ◽

2021 ◽

Author(s):

Sima Ebrahimian ◽

Bradley Mattan ◽

Mazaher Rezaei

Keyword(s):

Perspective Taking ◽

Visual Perspective ◽

First Person ◽

The Third ◽

Person Perspective ◽

Third Person ◽

First Person Perspective ◽

Level 1 ◽

Third Person Perspective ◽

The Third Person

Abstract Background: Lack of empathy is one of the main characteristics of narcissists. However, it is not clear whether there is a similar deficit in other facets of mentalizing, such as perspective-taking.Method: In this study, we measured the taking visual perspectives ascribed to different targets (e.g., first-person self, third-person self-avatar, and third-person stranger avatar). Our study focused on separate groups of individuals with high and low self-reported narcissistic traits. Results: Participants reporting high Narcissism scores showed higher accuracy in a third-person perspective-taking task than did their low-Narcissism counterparts. However, when the first-person perspective was incongruent with the third-person (first person vs. self- tagged avatar), the accuracy of their responses decreased.Conclusions: The discrepancy between the two types of perspective taking of people with high narcissism can probably mean that the narcissistic people perfectly identify / empathize with one object (person, avatar, character, etc.) and therefore their perspective-taking is disrupted when they need to identify with more than one object that represent their self-attributed perspectives.

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Effects of Avatar Perspective on Joint Excursions Used to Play Virtual Dodgeball: Within-Subject Comparative Study (Preprint)

10.2196/preprints.18888 ◽

2020 ◽

Author(s):

Susanne M van der Veen ◽

Alexander Stamenkovic ◽

Megan E Applegate ◽

Samuel T Leitkam ◽

Christopher R France ◽

...

Keyword(s):

Virtual Reality ◽

Repeated Measures ◽

First Person ◽

Head Mounted Display ◽

The Third ◽

Person Perspective ◽

Third Person ◽

First Person Perspective ◽

Third Person Perspective ◽

The Third Person

BACKGROUND Visual representation of oneself is likely to affect movement patterns. Prior work in virtual dodgeball showed greater excursion of the ankles, knees, hips, spine, and shoulder occurs when presented in the first-person perspective compared to the third-person perspective. However, the mode of presentation differed between the two conditions such that a head-mounted display was used to present the avatar in the first-person perspective, but a 3D television (3DTV) display was used to present the avatar in the third-person. Thus, it is unknown whether changes in joint excursions are driven by the visual display (head-mounted display versus 3DTV) or avatar perspective during virtual gameplay. OBJECTIVE This study aimed to determine the influence of avatar perspective on joint excursion in healthy individuals playing virtual dodgeball using a head-mounted display. METHODS Participants (n=29, 15 male, 14 female) performed full-body movements to intercept launched virtual targets presented in a game of virtual dodgeball using a head-mounted display. Two avatar perspectives were compared during each session of gameplay. A first-person perspective was created by placing the center of the displayed content at the bridge of the participant’s nose, while a third-person perspective was created by placing the camera view at the participant’s eye level but set 1 m behind the participant avatar. During gameplay, virtual dodgeballs were launched at a consistent velocity of 30 m/s to one of nine locations determined by a combination of three different intended impact heights and three different directions (left, center, or right) based on subject anthropometrics. Joint kinematics and angular excursions of the ankles, knees, hips, lumbar spine, elbows, and shoulders were assessed. RESULTS The change in joint excursions from initial posture to the interception of the virtual dodgeball were averaged across trials. Separate repeated-measures ANOVAs revealed greater excursions of the ankle (P=.010), knee (P=.001), hip (P=.0014), spine (P=.001), and shoulder (P=.001) joints while playing virtual dodgeball in the first versus third-person perspective. Aligning with the expectations, there was a significant effect of impact height on joint excursions. CONCLUSIONS As clinicians develop treatment strategies in virtual reality to shape motion in orthopedic populations, it is important to be aware that changes in avatar perspective can significantly influence motor behavior. These data are important for the development of virtual reality assessment and treatment tools that are becoming increasingly practical for home and clinic-based rehabilitation.

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A Constructive Explanation of Consciousness

Journal of Artificial Intelligence and Consciousness ◽

10.1142/s2705078520500125 ◽

2020 ◽

Vol 07 (02) ◽

pp. 257-275

Author(s):

Pei Wang

Keyword(s):

Self Control ◽

First Person ◽

Self Awareness ◽

Functional Aspect ◽

The Third ◽

Person Perspective ◽

Third Person ◽

First Person Perspective ◽

Third Person Perspective ◽

The Third Person

This paper describes the consciousness-related aspects of the AGI system NARS, discusses the implications of this design and compares it with other relevant theories and designs. It is argued that the function of consciousness is self-awareness and self-control, and the phenomenal aspect of consciousness is the first-person perspective of the same process for which the functional aspect is the third-person perspective.

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Valence of Temporal Self-Appraisals: A Comparison Between First-Person Perspective and Third-Person Perspective

Frontiers in Psychology ◽

10.3389/fpsyg.2021.778532 ◽

2021 ◽

Vol 12 ◽

Author(s):

Caizhen Yue ◽

Yihong Long ◽

Chaomei Ni ◽

Chunhua Peng ◽

Tong Yue

Keyword(s):

Recognition Rate ◽

First Person ◽

The Third ◽

Person Perspective ◽

Third Person ◽

First Person Perspective ◽

Future Self ◽

Third Person Perspective ◽

The Third Person ◽

Self Reference

Mental time travel is one of the most remarkable achievements of mankind. On the one hand, people perceive past self, present self, and future self as a continuous unity; on the other hand, people have the ability to distinguish among the three types of temporal selves because there are different representations of them. In this study, we used an adapted temporal self-reference paradigm to explore the processing mechanism of different temporal selves. Temporal self-reference was performed from the first-person perspective in Experiment 1 and from the third-person perspective in Experiment 2. The results indicated that people showed a more positive bias toward future self compared with past self and present self no matter in the first-person perspective or third-person perspective. There was no difference in recognition rate among past self, present self, and future self. Compared with the first-person perspective, present self-processing in the third-person perspective was more abstract and generalized, which may reflect that the third-person perspective has the same distancing function as time. This study can deepen understandings on temporal self-appraisals from different perspectives.

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Knowledge from the Outside

10.1093/oso/9780197609552.003.0003 ◽

2021 ◽

pp. 40-79

Author(s):

Hilary Kornblith

Keyword(s):

The Third ◽

Person Perspective ◽

The World ◽

Third Person ◽

First Person Perspective ◽

Third Person Perspective ◽

The Third Person ◽

Perceptual Systems ◽

Obvious Source

Knowledge may be examined from the third-person perspective, as psychologists and sociologists do, or it may be examined from the first-person perspective, as each of us does when we reflect on what we ought to believe. This chapter takes the third-person perspective. One obvious source of knowledge is perception, and some general features of how our perceptual systems are able to pick up information about the world around us are highlighted. The role of the study of visual illusions in this research is an important focus of the chapter. Our ability to draw out the consequences of things we know by way of inference is another important source of knowledge, and some general features of how inference achieves its successes are discussed. Structural similarities between the ways in which perception works and the ways in which inference works are highlighted.

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Viewpoint (In)dependence of Action Representations: An MVPA Study

Journal of Cognitive Neuroscience ◽

10.1162/jocn_a_00195 ◽

2012 ◽

Vol 24 (4) ◽

pp. 975-989 ◽

Cited By ~ 71

Author(s):

Nikolaas N. Oosterhof ◽

Steven P. Tipper ◽

Paul E. Downing

Keyword(s):

Mirror Neurons ◽

Premotor Cortex ◽

Neural Mechanism ◽

First Person ◽

The Third ◽

Person Perspective ◽

Third Person ◽

Third Person Perspective ◽

Motor Representations ◽

The Third Person

The discovery of mirror neurons—neurons that code specific actions both when executed and observed—in area F5 of the macaque provides a potential neural mechanism underlying action understanding. To date, neuroimaging evidence for similar coding of specific actions across the visual and motor modalities in human ventral premotor cortex (PMv)—the putative homologue of macaque F5—is limited to the case of actions observed from a first-person perspective. However, it is the third-person perspective that figures centrally in our understanding of the actions and intentions of others. To address this gap in the literature, we scanned participants with fMRI while they viewed two actions from either a first- or third-person perspective during some trials and executed the same actions during other trials. Using multivoxel pattern analysis, we found action-specific cross-modal visual–motor representations in PMv for the first-person but not for the third-person perspective. Additional analyses showed no evidence for spatial or attentional differences across the two perspective conditions. In contrast, more posterior areas in the parietal and occipitotemporal cortex did show cross-modal coding regardless of perspective. These findings point to a stronger role for these latter regions, relative to PMv, in supporting the understanding of others' actions with reference to one's own actions.

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