Improving the Reliability and Accuracy of Population Receptive Field Measures Using a Logarithmically Warped Stimulus.
bioRxiv
; 2024 Jun 13.
Article
en En
| MEDLINE
| ID: mdl-38915587
ABSTRACT
The population receptive field method, which measures the region in visual space that elicits a BOLD signal in a voxel in retinotopic cortex, is a powerful tool for investigating the functional organization of human visual cortex with fMRI (Dumoulin & Wandell, 2008). However, recent work has shown that population receptive field (pRF) estimates for early retinotopic visual areas can be biased and unreliable, especially for voxels representing the fovea. Here, we show that a 'log-bar' stimulus that is logarithmically warped along the eccentricity dimension produces more reliable estimates of pRF size and location than the traditional moving bar stimulus. The log-bar stimulus was better able to identify pRFs near the foveal representation, and pRFs were smaller in size, consistent with simulation estimates of receptive field sizes in the fovea.
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Colección:
01-internacional
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MEDLINE
Idioma:
En
Revista:
BioRxiv
Año:
2024
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Article