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Measurement of the Hand Transmitted Vibration of the Human Hand Arm System During Operation of a Hand Tractor

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Hand size underestimation grows during childhood.

Lucilla Cardinali¹, Andrea Serino², Monica Gori³

¹Fondazione Istituto Italiano di Tecnologia, Genova, Italy. lucilla.cardinali@iit.it.

Scientific Reports

|September 15, 2019

Summary

This summary is machine-generated.

Children aged 6-10 underestimate their hand size, a distortion that grows with age. This body representation bias, unlike object estimation, appears functional for interacting with the environment.

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Studying Proprioception Using the Rubber Hand Illusion

Studying Proprioception Using the Rubber Hand Illusion

Published on: April 30, 2023

Area of Science:

Developmental neuroscience
Body representation
Sensory perception

Background:

Cortical body size representations are known to be distorted in adults.
The developmental trajectory of these representations in children is largely unknown.

Purpose of the Study:

To investigate how hand size is represented in typically developing children aged 6 to 10.
To determine if body size underestimation is present and how it evolves during childhood.

Main Methods:

Children aged 6-10 estimated their hand size using visual and haptic sensory modalities.
Object size estimation was used as a control condition.

Main Results:

A significant underestimation of hand size was observed in children as young as 6.
This distortion increased with age and was independent of the sensory modality used.
No such bias was found when estimating object sizes, indicating specificity to body representation.

Conclusions:

The brain's representation of body size does not perfectly track natural growth during childhood.
Despite the distortion, motor behavior and perception remain unimpaired, suggesting a functional or compensated mechanism for environmental interaction.