September 2024
Volume 24, Issue 10
Open Access
Vision Sciences Society Annual Meeting Abstract  |   September 2024
Comparing pRF Mapping Estimates for Words and Checker Patterns
Author Affiliations & Notes
  • David Linhardt
    Medical University of Vienna, Austria
  • Yongning Lei
    BCBL. Basque Center on Cognition, Brain and Language, San Sebastián, Spain
  • Pedro M. Paz-Alonso
    BCBL. Basque Center on Cognition, Brain and Language, San Sebastián, Spain
    IKERBASQUE. Basque Foundation for Science, Bilbao, Spain
  • Brian Wandell
    Stanford University, Department of Psychology
  • Christian Windischberger
    Medical University of Vienna, Austria
  • Garikoitz Lerma-Usabiaga
    BCBL. Basque Center on Cognition, Brain and Language, San Sebastián, Spain
    IKERBASQUE. Basque Foundation for Science, Bilbao, Spain
  • Footnotes
    Acknowledgements  This work was supported by the Austrian Science Fund (FWF; P35583), the Spanish Ministerio de Ciencia e Innovación (IJC2020-042887-I; PID2021- 123577NA-I00, RYC2022-035502-I; CEX2020-001010/AEI/10.13039/501100011033) and Basque Government (BERC 2022-2025; PIBA_2022_1_0014; KK-2023/00090).
Journal of Vision September 2024, Vol.24, 1131. doi:https://doi.org/10.1167/jov.24.10.1131
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      David Linhardt, Yongning Lei, Pedro M. Paz-Alonso, Brian Wandell, Christian Windischberger, Garikoitz Lerma-Usabiaga; Comparing pRF Mapping Estimates for Words and Checker Patterns. Journal of Vision 2024;24(10):1131. https://doi.org/10.1167/jov.24.10.1131.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Functional MRI responses from voxels in the visual cortex are driven by stimuli within restricted regions of the visual field, their so-called population receptive fields (pRF). The central position and size of every voxel’s receptive field can be quantified using pRF mapping. In a previous report, we measured the pRF centers of individual voxels using words and contrast-reversing checker patterns shown within the stimulation area. The pRF centers measured with words differed from those measured with checkers. Voxels with a pRF center in the near periphery (5-10 degrees visual angle from the fixation) are more eccentric (1-3 degrees) when measured with checkers compared to words. To gain a deeper understanding of these effects, we acquired new datasets that differed significantly from the previous data. These variations included using different MRI scanners, fields of view, and acquisition sequences with either high-temporal or high-spatial resolution. Additionally, we adapted the used stimuli (such as variations in bar width and speed, flickering frequency) and participant populations, including individuals with both uncorrected and corrected visual acuity. Data were analyzed using a highly reproducible containerized public analysis platform (prfprepare and prfanalyze-vista). Results confirm the main effect in higher visual areas (hV4, VO1, IPS0-1). Further, initial measurements suggest specific stimulus manipulations (including defocus) impact the size of the change in eccentricity. Moreover, these manipulations may have different impacts on the eccentricity shift measured in different visual field maps. These findings offer a compelling starting point to further investigate stimuli induced pRF differences.

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