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Brain Imaging

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans), magnetic resonance imaging (MRI), functional magnetic resonance imaging (fMRI), and Transcranial Magnetic Stimulation (TMS).

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Functional Brain Mapping of Body Size Estimation Using a 3D Avatar.

Hayden J Peel^1,2, Joel P Diaz-Fong^1,3,4, Sameena Karsan¹

¹Brain Health Imaging Centre, Centre for Addiction and Mental Health, Toronto, Ontario, Canada.

Biorxiv : the Preprint Server for Biology

|August 6, 2025

Summary

This study reveals the superior parietal lobule is key for accurate body size estimation. This brain region is crucial for understanding body perception and may be implicated in disorders like eating disorders.

Keywords:

body image perception body representation fMRI parametric modulation perceptual distortion

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Area of Science:

Neuroscience
Cognitive Psychology
Body Image Research

Background:

Body size estimation is vital for body image but its neural basis is unclear.
Existing tools for assessing body size estimation accuracy have limitations.

Purpose of the Study:

To investigate the neural basis of body size estimation.
To identify brain regions associated with inter-individual differences in body size estimation accuracy.

Main Methods:

Developed Somatomap 3D, an interactive fMRI-compatible task for body size estimation.
Analyzed brain activity in 28 healthy adults using fMRI.
Correlated estimation accuracy with BOLD signals in regions of interest.

Main Results:

Significant brain activation observed in body-selective and multisensory regions (e.g., extrastriate body area, superior parietal lobule).
Superior parietal lobule activity correlated with accuracy in estimating body part girths.
No other brain regions showed significant associations with estimation accuracy.

Conclusions:

Body size estimation involves a distributed network including visual, motor, and parietal regions.
The superior parietal lobule is a candidate neural substrate for altered body representation in psychiatric conditions like eating disorders and body dysmorphic disorder.