The longer the reference, the shorter the legs: How response modality affects body perception

Area of Science:

• Neuroscience
• Somatosensory research
• Body representation

Background:

• The internal body model, representing body metric properties, is of increasing research interest.
• The Tactile Distance Task (TDT) assesses body metrics via perceived distances between tactile stimuli.

Purpose of the Study:

• To investigate distortions in the internal body model, specifically for the leg.
• To evaluate the reliability and replicability of the Tactile Distance Task (TDT).
• To compare the efficacy of two scoring indices: Global shape index and Misestimation of the distance.

Main Methods:

• Utilized the Tactile Distance Task (TDT) to measure perceived distances on the leg.
• Controlled for confounds such as body part, response estimation method, and result replicability.
• Compared Global shape index and Misestimation of the distance scoring methods.

Main Results:

• Revealed significant distortions in the body metric perception of the leg.
• Demonstrated a greater reduction in proximo-distal distances compared to medio-lateral distances.
• TDT proved to be a reliable and replicable method for assessing body metric perception across different body parts.

Conclusions:

• The Global shape index is robust against experimental variations, while verbal responses offer the most precise estimation for the Misestimation index.
• The study supports the combined use of both indices for a comprehensive understanding of body metric representation distortions.
• Findings highlight specific distortions in leg somatosensory perception and validate TDT as a robust assessment tool.