Integrating multisensory information across external and motor-based frames of reference

Liu, Yuqi; Medina, Jared

doi:10.1016/j.cognition.2018.01.005

Cited by 6 publications

(3 citation statements)

References 39 publications

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“…In our study, significant differences were found between the MT and VT groups and between the MT-R and VT groups ( p < .001 for both) (Figure 2). A previous study demonstrated that the higher the sense of body ownership, the greater the change in perceived hand position before and after the introduction of MT, and the two tended to be the same (Liu & Medina, 2018). In this experiment, the VAS (converted to a continuous scale from 0 to 100) for the group showed significant perceptual changes after MT ( M = 87.3 , SD = 11.7).…”

Section: Discussionmentioning

confidence: 98%

Augmented Visual Feedback for Complex Motor Skill Acquisition: A Demonstration with Healthy Young Adults

Miyamoto,

Kawahara,

Mori

et al. 2023

Percept Mot Skills

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Mirror therapy (MT) is a treatment for improving motor function after stroke. Video therapy (VT) training combines observation and imitation of video clips, and it has been used to conduct efficient occupational therapy. We sought to determine the effects of MT and VT on tool-use with healthy young adults. We assigned participants to three different training groups in which they used their non-dominant left hands to move a ball with chopsticks: (a) a self-paced MT group ( N = 14), (b) an MT group who moved the ball while looking at the mirror image of the right hand with a sound cue (4-second intervals) ( N = 12), and (c) a group who imitated a video demonstration (4-second intervals) ( N = 13). The ball-moving time was significantly reduced after training in all three groups: MT group ( p < .001), MT-R group ( p = .010), and VT group ( p = .014), but the video group showed significantly greater relative improvements in motion variability ( p = .030) and object prediction ( p = .008).We concluded that MT was as effective as VT in improving movement speed, but, with these healthy young adults, MT was less effective than VT in learning speed control or hand pre-shaping to refine task movements for tool use.

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Section: Discussionmentioning

confidence: 98%

Augmented Visual Feedback for Complex Motor Skill Acquisition: A Demonstration with Healthy Young Adults

Miyamoto,

Kawahara,

Mori

et al. 2023

Percept Mot Skills

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“…Each condition is named as P x V y , with P representing the proprioceptive position and V the visual position of the hand, and x and y denoting the distance of proprioceptive and visual position from the mirror respectively. Previous studies have shown that a mismatch of 6" between the proprioceptive and visual hand position in the mirror box reliably induced shifts in felt hand position toward the visual position (Liu & Medina, 2018;Medina et al, 2015). In each condition, participants were touched on the dorsum of the hidden left hand and reported where on the skin surface they felt the stimulus (see Procedures below).…”

Section: Designmentioning

confidence: 99%

Visuoproprioceptive conflict in hand position biases tactile localization on the hand surface.

Liu¹,

Medina²

2021

Journal of Experimental Psychology: Human Perception and Perfor

Self Cite

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The location of touch can be represented in a somatotopic reference frame and, combined with proprioceptive information, in an external reference frame. There is evidence that body position influences where individuals feel touch on the skin surface, indicating that proprioceptive information affects tactile localization in a somatotopic reference frame. In conditions with visual and proprioceptive mismatch of body position, where do individuals feel touch on the body? We used the mirror box illusion to address this question. Participants placed 1 hand on each side of a mirror aligned with the body midline, such that the hand reflection in the mirror looked like the hand hidden behind the mirror. The illusion creates a spatial mismatch between the actual hidden hand position and where the participant perceives their hand to be (the mirror image location). Across three experiments, localization judgments on the hidden hand were consistently and systematically biased toward the actual hand position relative to the viewed hand position. These findings provide evidence that proprioceptive estimates of limb position influence tactile localization and are discussed in relation to two models of tactile localization.

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“…The mirror box was created in an attempt to treat patients with intractable phantom limb pain, particularly patients who felt their lost limb was clenched, with the fingernails digging into the skin (Ramachandran & Rogers-Ramachandran, 1996); watching the contralateral spared limb reflected in the mirror created the illusion of watching the lost limb and therefore, to watch it unclench, which was meant to alleviate the pain. The mirror box is often used to explore multisensory integration by manipulating visual, tactile, and proprioceptive information about the hands (e.g., Cardini & Longo, 2016;Holmes et al, 2004;Liu & Medina, 2018;Sadibolova & Longo, 2014;Romano et al, 2013). A typical Six finger illusion 5 mirror box setup is shown in Figure 1.…”

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confidence: 99%

A Continuous Illusion of Having a Sixth Finger

Cadete

Longo

2020

Perception

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Our body is central to our sense of self and personal identity, yet it can be manipulated in the laboratory in surprisingly easy ways. Several multisensory illusions have shown the flexibility of the mental representation of our bodies by inducing the illusion of owning an artificial body part or having a body part with altered features. Recently, new studies showed we can embody additional body parts such as a supernumerary finger. Newport et al. recently reported a novel six-finger illusion using conflicting visual and tactile signals induced with the mirror box to create the illusory perception of having a sixth finger for a brief moment. In this study, we aimed to replicate this result and to investigate whether the experience of embodiment of a sixth finger could be prolonged for an extended duration by applying continuous visual–tactile stimulation. Results showed that a continuous illusion of having a sixth finger can be clearly induced. This shows that the six-finger illusion does not reflect merely a momentary confusion due to conflicting multisensory signals but can reflect an enduring representation of a supernumerary finger.

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Integrating multisensory information across external and motor-based frames of reference

Cited by 6 publications

References 39 publications

Augmented Visual Feedback for Complex Motor Skill Acquisition: A Demonstration with Healthy Young Adults

Augmented Visual Feedback for Complex Motor Skill Acquisition: A Demonstration with Healthy Young Adults

Visuoproprioceptive conflict in hand position biases tactile localization on the hand surface.

A Continuous Illusion of Having a Sixth Finger

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