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Abstract #2198

Population-receptive field size estimates are biased by acquisition and preprocessing parameters: a 7T fMRI study

Christian Windischberger1, David Linhardt1, Tessa Angerer1, Maximilian Pawloff2, Markus Ritter2, and Ursula Schmidt-Erfurth2
1High Field MR Center, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Wien, Austria, 2Department of Ophtalmology, Medical University of Vienna, Wien, Austria


Population receptive field (pRF) mapping is an advanced retinotopic mapping approach. While the size of pRFs has been identified as an important neurophysiological feature, remarkable differences in the pRF sizes across studies has been reported. In this study, we examine the effects of difference in spatial resolution on the pRF size obtained in a group of ten healthy subjects at 7T. Our results clearly show that the amount of spatial dependence between voxels in the visual cortex has a direct effect for the pRF sizes calculated. We can assume similar effects in data sets acquired at different spatial resolutions.

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