Illusory Visual Completion of an Object’s Invisible Backside Can Make Your Finger Feel Shorter

Ekroll, Vebjørn; Sayim, Bilge; Hallen, Ruth Van der; Wagemans, Johan

doi:10.1016/j.cub.2016.02.001

Cited by 38 publications

(49 citation statements)

References 24 publications

(35 reference statements)

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“…In particular, a previous study that used an approach similar to ours (Ekroll et al, 2016) found that estimation of finger length was differently modulated depending on the approach used, with greater effects of the 'shrunken finger illusion' for apparent than objective instructions.…”

Section: Discussionmentioning

confidence: 67%

“…However, in their study authors found, though less, some distortions also in the objective condition suggesting that participants were not completely able to distinguish between their actual beliefs and their subjective feelings (Ekroll et al, 2016). This result is important in demonstrating that participants are able to discriminate the difference between the two instruction types in terms of making judgments about the body.…”

Section: Discussionmentioning

confidence: 68%

“…If they do not realize that they are producing a certain pattern (e.g., squat, fat hand map), it is not obvious how they could deliberately produce equally squat, fat hand maps in the both conditions. Finally, a recent report by Ekroll and colleagues (2016) successfully adopted a within-subject design in a very similar manipulation (Ekroll et a., 2016). hand. To ensure independent responses, participants moved the baton to the side of the table between trials.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, Ekroll and colleagues (Ekroll, Sayim, Van der Hallen, & Wagemans, 2016) using a visuo-proprioceptive illusion (the "shrunken finger illusion") reported a dissociation between apparent and objective instructions in a body-size estimation judgment. They asked participants to estimate the length of a finger (i.e., middle finger) viewing it directly from above when a semispherical coloured or a transparent shell was placed on the top of it, depending on the condition.…”

Section: Apparent and Objective Instructionsmentioning

confidence: 99%

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Distorted body representations are robust to differences in experimental instructions

Tamè

Bumpus

Linkenauger

et al. 2017

Atten Percept Psychophys

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Several recent reports have shown that even healthy adults maintain highly distorted representations of the size and shape of their body. These distortions have been shown to be highly consistent across different study designs and dependent measures. However, previous studies have found that visual judgments of size can be modulated by the experimental instructions used, for example, by asking for judgments of the participant's subjective experience of stimulus size (i.e., apparent instructions) versus judgments of actual stimulus properties (i.e., objective instructions).Previous studies investigating internal body representations have relied exclusively on 'apparent' instructions. Here, we investigated whether apparent versus objective instructions modulate findings of distorted body representations underlying position sense (Exp. 1), tactile distance perception (Exp. 2), as well as the conscious body image (Exp. 3). Our results replicate the characteristic distortions previously reported for each of these tasks and further show that these distortions are not affected by instruction type (i.e., apparent vs. objective). These results show that the distortions measured with these paradigms are robust to differences in instructions and do not reflect a dissociation between perception and belief.3

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Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 68%

Section: Methodsmentioning

confidence: 99%

Section: Apparent and Objective Instructionsmentioning

confidence: 99%

See 2 more Smart Citations

Distorted body representations are robust to differences in experimental instructions

Tamè

Bumpus

Linkenauger

et al. 2017

Atten Percept Psychophys

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show abstract

“…A similar finding was reported by Kalckert and Ehrsson (2012) 36) . Ekroll et al (2016) 37) reported another visuoproprioceptive illusion. When a semi-spherical shell was put on top of a subject's finger and subjects viewed it directly from above, subjects experienced their finger to be shortened.…”

Section: Visual and Proprioceptive Signalsmentioning

confidence: 99%

The role of sensory signals in perception of the body

Sakamoto

2017

JPFSM

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Humans perceive their body posture, size, and position in space even when they do not look at their body. The ability to perceive the body correctly is essential to move accurately in space. The purpose of this review is to introduce the reader to the latest views on the role of peripheral afferent signals in the generation and alteration of perception of the body. First, the contribution of proprioceptive and cutaneous signals to perception of the body is introduced. Common methods to investigate these signals are muscle vibration, skin stretch, or electrical stimulation. These methods provide evidence that the perception of the body is flexible. Second, effects of multisensory integration on perception of the body are described. The combination of visual, tactile, proprioceptive, and auditory signals alter the perception of the body, suggesting that multiple sensory signals contribute to perception of the body. Third, the distortion of perception of the body after the loss of sensory signals is reviewed. Anesthesia or amputation of limbs, as well as experimentally-induced disintegration of sensory signals drastically alter the perception of the body. Fourth, neural mechanisms underlying the generation, or alteration, of perception of the body is described. The premotor and parietal cortices play a key role in perception of the body, as they are involved in multisensory integration. In the final section of the review, implications of the ways sensory information shapes perception of our body are discussed for athletic performance.

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Introduction: Trends, Puzzles, and Hopes for the Future of Healthcare

Ehsani

Glauner

Plugmann

et al. 2022

Future of Business and Finance

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This book is being published at a time when the collective attention of the world has been focused, for more than 2 years, on the coronavirus pandemic. The interrelatedness of various facets of biomedicine (whether scientific, societal, political, legal, or cultural) has been vividly illustrated to health practitioners, researchers, and the public at large—often on a very personal level. It is now manifestly obvious to many that planning for the future of clinical and experimental medicine is a must. Although the task of predicting the exact trajectory of any profession might be in vain, it is essential that one at least looks at past and current trends in order to envision future scenarios and plan for them. We can thus shape our expectations about how the various threads of biomedicine could develop; these could then inform our preparedness.

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Illusory Visual Completion of an Object’s Invisible Backside Can Make Your Finger Feel Shorter

Cited by 38 publications

References 24 publications

Distorted body representations are robust to differences in experimental instructions

Distorted body representations are robust to differences in experimental instructions

The role of sensory signals in perception of the body

Introduction: Trends, Puzzles, and Hopes for the Future of Healthcare

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