Tactile confusions of the fingers and toes.
TLDR
It is suggested that mislocalizations occur at the level of individual digits, consistent with their resulting from higher level body representations, which represent the digits as volumetric units.Abstract:
Recent research has shown systematic patterns of confusions between digits of the hands and feet. The present study addressed whether such confusions arise from early somatosensory maps or higher-level body representations. As the glabrous and hairy skin of the hands and feet have distinct representations in somatosensory cortex, an effect arising from early somatotopic maps may show distinct patterns on each skin surface. In contrast, if the effect arises from higher-level body representations which represent the digits as volumetric units, similar patterns should be apparent regardless of which side of the digit is touched. We obtained confusion matrices showing the pattern of mislocalisation on the glabrous and hairy skin surfaces of the toes (Experiment 1) and fingers (Experiment 2). Our results replicated the characteristic pattern of mislocalisations found on the glabrous skin reported in previous studies. Critically, these effects were highly similar on the hairy skin surface of both the toes and fingers. Despite the pattern of mislocalisations being highly stereotyped across participants, there were consistent individual differences in the pattern of confusions across the two skin surfaces. These results suggest that mislocalisations occur at the level of individual digits, consistent with their resulting from higher-level body representations.read more
Citations
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Four meta-analyses across 164 studies on atypical footedness prevalence and its relation to handedness.
Julian Packheiser,Judith Schmitz,Gessa Berretz,David P. Carey,Silvia Paracchini,Marietta Papadatou-Pastou,Sebastian Ocklenburg,Sebastian Ocklenburg +7 more
TL;DR: It was showed that the prevalence of atypical footedness ranges between 12.10% using the most conservative criterion of left-footedness to 23.7% including all left- and mixed-footers as a single non-right category, and that footing is a valuable phenotype for the study of lateral motor biases, its underlying genetics and neurodevelopment.
Journal ArticleDOI
Tactile distance anisotropy on the palm: A meta-analysis.
TL;DR: The present results show that, despite inconsistent results across studies, the existing data do indicate an anisotropy of tactile distance on the palm of the hand, which is substantially smaller in magnitude, and the two biases appear to be uncorrelated.
Journal ArticleDOI
A continuous illusion of having a sixth finger
Denise Cadete,Matthew R. Longo +1 more
TL;DR: Results showed that a continuous illusion of having a sixth finger can be clearly induced, which 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.
Journal ArticleDOI
A Systematic Comparison of Perceptual Performance in Softness Discrimination with Different Fingers
Aaron C. Zoeller,Knut Drewing +1 more
TL;DR: Results indicate that humans use successive phases of different fingers and finger combinations during an exploration, preferring index, middle, and (to a lesser extent) ring finger, while in spontaneous exploration the preference of combinations of index,middle, and partly ring finger seems to be well chosen.
Journal ArticleDOI
A common representation of fingers and toes
TL;DR: This work obtained confusion matrices showing the pattern of mislocalisation on the hairy skin surfaces of both the fingers and toes, which suggest that there is a common representation of the hands and toes.
References
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TL;DR: G*Power 3 provides improved effect size calculators and graphic options, supports both distribution-based and design-based input modes, and offers all types of power analyses in which users might be interested.
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The assessment and analysis of handedness: The Edinburgh inventory
TL;DR: An inventory of 20 items with a set of instructions and response- and computational-conventions is proposed and the results obtained from a young adult population numbering some 1100 individuals are reported.
The assessment and analysis of handedness
TL;DR: In this paper, an inventory of 20 items with a set of instructions and response-and computational-conventions is proposed and the results obtained from a young adult population numbering some 1100 individuals are reported.
Journal ArticleDOI
Tactile sensibility in the human hand: relative and absolute densities of four types of mechanoreceptive units in glabrous skin.
Roland S. Johansson,A B Vallbo +1 more
TL;DR: The spatial distribution of densities supports the idea that the RA and SA I units account for spatial acuity in psychophysical tests, which is known to increase in distal direction along the hand.
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Footedness is a better predictor than is handedness of emotional lateralization
TL;DR: Some recent reports suggest that preferred footedness may serve as a more accurate predictor of functional laterality, especially in the left-handed population, and the present study sought to test this claim by selectively recruiting individuals with 'crossed' lateral preferences.