The perceived size of the implicit representation of the dorsum and palm of the hand

D’Amour, Sarah; Harris, Laurence R.

doi:10.1371/journal.pone.0230624

Cited by 3 publications

(4 citation statements)

References 45 publications

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“…Control objects should also possess such complexity to make a fair comparison. In addition, a recent study found that implicit perceived width of the hand was dependent on the orientation of the hand (upright versus right orientation), but overestimation in perception of length of the hand only occurred for dorsum and not the palm 36 . The orientation of the hand as well as whether the potential change in perception of size is isotropic or not should be considered in future replications.…”

Section: Discussionmentioning

confidence: 96%

Perception of the non-dominant hand as larger after non-judgmental focus on its details

Ghaderi

Welch

2022

Sci Rep

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We investigated whether brief non-judgmental focus on the details of one’s non-dominant hand might lead to changes in perception of its size, and if such a change would be related to central coherence, body dissatisfaction, or how much participants liked their hand. After two pilot experiments (N = 28 and N = 30 respectively: Appendix 1), a within-subject experiment (N = 82) was conducted. Subjects were mainly university students. They were asked to rate the size of their non-dominant hand and how much they liked it, and the size of an external object (a X-box controller) on a visual-analog scale before and after focusing on their details for 5 min, as well as the size of another object (a calculator) before and after a 5 min long distraction task. After completing the tasks, they were asked to respond to a brief questionnaire on body dissatisfaction. A s significant interaction between time and factors (non-dominant hand, X-box controller and calculator) emerged (F(2, 78) = 6.41, p = .003). Participants rated their hand as larger after focusing on its details compared to baseline, and this change was significantly larger than those reported for the X-box controller. No significant change in how they liked their hand was observed, and contrary to the pilot experiments, the perceived change in size of the hand was not related to body dissatisfaction. The significant change in reporting of the size of the hand after focusing on its details seems to be an interesting finding, worth further replications.

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Section: Discussionmentioning

confidence: 96%

Perception of the non-dominant hand as larger after non-judgmental focus on its details

Ghaderi

Welch

2022

Sci Rep

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“…We used the novel psychophysical method described in our previous studies [2][3][4]. In this method, we show two sequential images-a reference image and a test image-and ask the participant to judge which image most closely resembles their idea of their own body.…”

Section: Visual Adaptationmentioning

confidence: 99%

“…But perceptual disturbances of body representation are also found in healthy people (e.g. [2][3][4]. Therefore, it is also crucial to understand the mechanism that underlies any such inaccuracy in the non-clinical population.…”

Section: Introductionmentioning

confidence: 99%

Changes in the perceived size of the body following exposure to distorted self-body images

2022

Self Cite

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Inaccurate perceptions, such as under- or over-estimation of body size are often found in clinical eating disorder populations but have recently been shown also in healthy people. However, it is not yet clear how body size perception may be affected when the internal body representation is manipulated. In this study, visual adaptation was used to investigate whether exposure to distorted visual feedback alters the representation of body size and how long any such effects might last. Participants were exposed for five minutes to a distorted life-size image of themselves that was either 20% wider or 20% narrower than their normal size. Accuracy was measured using our novel psychophysical method that taps into the implicit body representation. The accuracy of the representation was assessed at 6, 12 and 18 min following exposure to adaptation. Altered visual feedback caused changes in participants' judgements of their body size: adapting to a wider body resulted in size overestimation whereas underestimations occurred after adapting to a narrower body. These distortions lasted throughout testing and did not fully return back to normal within 18 min. The results are discussed in terms of the emerging literature indicating that the internal representation of the body is dynamic and flexible.

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“…However, the ipsilateral joint position matching might be related to working memory, which is a cognitive system of limited capacity that holds information temporarily ( Elangovan et al, 2014 ). The participant in this kind of experiment is asked to focus on perceiving the spatial position of an occluded joint in a very short period, usually a few seconds, whose process is closer to the connotation of body representation that is a neural representation of the body parts relative to each other and one’s knowledge and belief of his or her own body ( Corbett and Shah, 1996 ; de Vignemont, 2010 ; Longo and Haggard, 2010 ; Medina and Coslett, 2010 ; Assaiante et al, 2014 ; Vita et al, 2016 ; Llorens et al, 2017 ; Pitron and de Vignemont, 2017 ; Pitron et al, 2018 ; Gadsby, 2019 ; Leemhuis et al, 2019 ; Di Vita et al, 2020 ; D’Amour and Harris, 2020 ; Raimo et al, 2021 ). Regarding the codification mechanism of proprioceptive acuity, some of the previous research has suggested it is highly correlated with joint position ( Marini et al, 2017b , 2018 ), while some evidence suggested it is amplitude based rather than position based ( Marini et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Body representation underlies response of proprioceptive acuity to repetitive peripheral magnetic stimulation

Xia

Tanaka

Yang

et al. 2022

Front. Hum. Neurosci.

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Proprioceptive acuity is of great significance in basic research exploring a possible neural mechanism of fine motor control and in neurorehabilitation practice promoting motor function recovery of limb-disabled people. Moreover, body representation relies on the integration of multiple somatic sensations, including proprioception that is mainly generated in muscles and tendons of human joints. This study aimed to examine two hypotheses: First, different extension positions of wrist joint have different proprioceptive acuities, which might indicate different body representations of wrist joint in the brain. Second, repetitive peripheral magnetic stimulation (rPMS) applied peripherally to the forearm radial nerve and extensors could change proprioceptive acuity at the wrist joint. Thirty-five healthy participants were recruited then randomly divided into the real stimulation group (n = 15) and the sham stimulation group (n = 20). The participants’ non-dominant side wrist joint position sense was tested at six extension positions within the physiological joint motion range (i.e., 10°, 20°, 30°, 40°, 50°, 60°) both before stimulation and after stimulation. Results showed that proprioceptive bias (arithmetic difference of target position and replicated position) among six extension positions could be divided into lower-extension position (i.e., 10°, 20°, 30°) and higher-extension position (i.e., 40°, 50°, 60°). One session rPMS could influence proprioceptive bias in lower-extension position but not in higher-extension position. However, proprioceptive precision (standard deviation within lower-extension position and higher-extension position) was not influenced. To conclude, proprioceptive bias may vary between different wrist extension positions due to different hand postures being related to changes in body representation, and different functions relating to proprioceptive bias and proprioceptive precision may underlie two aspects of body representation.

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The perceived size of the implicit representation of the dorsum and palm of the hand

Cited by 3 publications

References 45 publications

Perception of the non-dominant hand as larger after non-judgmental focus on its details

Perception of the non-dominant hand as larger after non-judgmental focus on its details

Changes in the perceived size of the body following exposure to distorted self-body images

Body representation underlies response of proprioceptive acuity to repetitive peripheral magnetic stimulation

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