Related Experiment Video
Updated: Jul 18, 2025
06:02
Topographical Estimation of Visual Population Receptive Fields by fMRI
Published on: February 3, 2015
9.3K
Two-Dimensional Population Receptive Field Mapping of Human Primary Somatosensory Cortex.
Michael Asghar1, Rosa Sanchez-Panchuelo2,3, Denis Schluppeck4
1Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK. michael.asghar@nottingham.ac.uk.
Brain Topography
|August 27, 2023
Summary
This study maps the human brain
Area of Science:
- Neuroscience
- Somatosensory system
- Neuroimaging
Background:
- Functional magnetic resonance imaging (fMRI) reveals brain sensory maps.
- Previous studies used limited stimulators, potentially simplifying sensory representations.
Purpose of the Study:
- To create detailed 2D sensory maps of the hand in the human brain.
- To investigate digit representation across somatosensory areas.
- To compare 2D population receptive field (pRF) models with 1D models.
Main Methods:
- Utilized a novel 16-stimulator (4x4 grid) setup for 2D tactile stimulation.
- Employed high-resolution (1.25 mm isotropic) 7 Tesla fMRI.
- Applied population receptive field (pRF) modeling with a 2D Gaussian model.
Main Results:
- Somatosensory areas show a preference for within-digit tactile representation.
- pRF size increases across digits D2-D5.
- Brodmann area 2 exhibits larger pRF size estimates compared to BA 3a.
Conclusions:
- A 2D Gaussian pRF model accurately captures detailed sensory maps from 2D stimulation.
- The findings provide a more nuanced understanding of somatosensory digit representation.
- High-resolution fMRI with advanced pRF modeling advances brain mapping capabilities.
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