Emergence of sense of body ownership but not agency during virtual tool-use training is associated with an altered body schema

Najafabadi, Amir Jahanian; Küster, Dennis; Putze, Felix; Godde, Ben

doi:10.1007/s00221-023-06644-3

Cited by 3 publications

(1 citation statement)

References 78 publications

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“…Results indicated that VT Feedback was more effective leading to a reduction in gripper size on average. Further results revealed that PE was significantly lower (more negative, indicating more reduction in gripper size) for the VT than for the V Feedback condition (for review; Jahanian Najafabadi, Küster, Putze & Godde, 2023a). In a second study in OA, we found a similar performance level as in YA during training Blocks.…”

Section: How Does the Practice Effect Vary With Sensory Feedback Cond...supporting

confidence: 54%

Association between resting-state and task-related EEG and practice effect in young and older adults

Najafabadi¹,

Küster²,

Putze³

et al. 2023

Preprint

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We examined whether resting-state and task-related oscillations differently predict the practice effect during virtual tool-use training in young (YA) and older (OA) adults. Thirty-seven YA (Mage: 23.64, SD: 7.07) and forty-one OA (Mage: 68.92, SD: 4.49) learned to control a virtual gripper to grasp a virtual object. The training was organized in two blocks (120 trials each). In one block, vibrotactile feedback was applied to the right hand's palm, thumb, and index fingers through a CyberTouch II glove when the tool touched the object. In the other block, participants only received visual feedback. The total practice effect was calculated per block as the relative gripper size at the end of the block compared to the starting gripper size. The latter has been changed adaptively by decreasing the width of the tool in a 3 down / 1 up staircase procedure. Resting-state EEG was collected before the first and second training block (pre-test) and task-related EEG was collected during first and second training blocks. Results revealed that higher relative beta power at rest predicts stronger practice effect in YA, while there is an inverse association between higher relative beta power at rest and lower practice effect in OA. In addition, higher task-related relative theta power in frontal and occipital regions and lower task-related relative alpha power in frontal and parietal regions predicted stronger practice effect in YA. We, therefore, conclude that the stronger practice effect during virtual tool-use training can be predicted by resting-state relative beta power, higher task-related relative theta power and lower task-related alpha across different regions in YA but not in OA.

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Section: How Does the Practice Effect Vary With Sensory Feedback Cond...supporting

confidence: 54%

Association between resting-state and task-related EEG and practice effect in young and older adults

Najafabadi¹,

Küster²,

Putze³

et al. 2023

Preprint

View full text Add to dashboard Cite

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Effects of symmetrical avatar arm movements on the sense of ownership of both hands inverted in a mirror

Fujita,

Horii,

Torres Mailleux

et al. 2023

29th ACM Symposium on Virtual Reality Software and Technology

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Investigating body perception of multiple virtual hands in synchronized and asynchronized conditions

Mashiyama,

Kondo,

Fukuoka

et al. 2024

Front. Virtual Real.

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As part of research on human augmentation, multiple bodies are used in a virtual environment. For example, a study on multiple partial body parts has been conducted using up to 64 hands and showed that multiple hands reduced the distance traveled by one hand. However, body perception has yet to be verified. In this study, we investigated how body perception changes when nine hands, partial bodies, are moved synchronously in a virtual environment, compared to a single hand. In addition, we examined whether the sense of body ownership for all nine hands was elicited simultaneously or whether it was elicited for some of the hands while switching between them. Participants performed a reaching task using one or nine hands presented in a virtual environment. After the reaching task, a threat stimulus was given, and hand movements in response to the threat were measured. After completion of each condition, the subjective sense of body ownership and sense of agency was investigated using a Likert scale. The results indicated that users felt the sense of body ownership of several hands for the nine hands and manipulated them by switching their attention to multiple bodies.

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Emergence of sense of body ownership but not agency during virtual tool-use training is associated with an altered body schema

Cited by 3 publications

References 78 publications

Association between resting-state and task-related EEG and practice effect in young and older adults

Association between resting-state and task-related EEG and practice effect in young and older adults

Effects of symmetrical avatar arm movements on the sense of ownership of both hands inverted in a mirror

Investigating body perception of multiple virtual hands in synchronized and asynchronized conditions

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