http://hdl.handle.net/2451/33725 Fri, 24 Apr 2026 08:50:56 GMT 2026-04-24T08:50:56Z http://hdl.handle.net/2451/63953 Title: Foveated metamers of the early visual system Authors: Broderick, William F.; Rufo, Gizem; Winawer, Jonathan; Simoncelli, Eero P. Sat, 01 Jan 2022 00:00:00 GMT http://hdl.handle.net/2451/63953 2022-01-01T00:00:00Z http://hdl.handle.net/2451/63344 Title: Mapping Spatial Frequency Preferences Across Human Primary Visual Cortex Authors: Broderick, William F.; Simoncelli, Eero P.; Winawer, Jonathan Abstract: Neurons in primate visual cortex (area V1) are tuned for spatial frequency, in a manner that depends on their position in the visual field. Several studies have examined this dependency using fMRI, reporting preferred spatial frequencies (tuning curve peaks) of V1 voxels as a function of eccentricity, but their results differ by as much as two octaves, presumably due to differences in stimuli, measurements, and analysis methodology. Here, we characterize spatial frequency tuning at a millimeter resolution within human primary visual cortex, across stimulus orientation and visual field locations. We measured fMRI responses to a novel set of stimuli, constructed as sinusoidal gratings in log-polar coordinates, which include circular, radial, and spiral geometries. For each individual stimulus, the local spatial frequency varies inversely with eccentricity, and for any given location in the visual field, the full set of stimuli span a broad range of spatial frequencies and orientations. Over the measured range of eccentricities, the preferred spatial frequency is well-fit by a function that varies as the inverse of the eccentricity plus a small constant. We also find small but systematic effects of local stimulus orientation, defined in both absolute coordinates and relative to visual field location. Specifically, peak spatial frequency is higher for tangential than radial orientations and for horizontal than vertical orientations. Description: This dataset is the "partially-processed" data for the spatial frequency preferences project, and contains the .mat files created by GLMdenoise. Additionally, this dataset contains prebuilt docker and singularity containers of the python environment. See Github README for more details: https://github.com/billbrod/spatial-frequency-preferences Thu, 30 Sep 2021 00:00:00 GMT http://hdl.handle.net/2451/63344 2021-09-30T00:00:00Z http://hdl.handle.net/2451/33887 Title: Population Receptive Field Size Estimates in 3 Human Retinotopic Maps Authors: Winawer, Jonathan; Horiguchi, Hiroshi Abstract: This schematic figure shows the estimated size of population receptive fields for 3 retinotopic maps in human visual cortex. Measurements were made with functional magnetic resonance imaging, and data were fit with a compressive spatial summation population receptive field model (Kay et al, 2013, doi:10.1152/jn.00105.2013 ). This figure is adapted from a similar figure made for neural receptive fields in macaque monkey (Figure 1b in Freeman and Simoncelli, 2011, doi:10.1038/nn.2889). Matlab (Mathworks) code was provided by Eero Simoncelli and adapted by Hiroshi Horiguchi and Jonathan Winawer to make this figure. The values used to make the circles were taken from the best fit regression lines in figure 7a of Kay et al, 2013 (doi:10.1152/jn.00105.2013). The radius of the circles are 1 standard deviation of the effective pRF size for a given eccentricity for each area. Fri, 13 Mar 2015 00:00:00 GMT http://hdl.handle.net/2451/33887 2015-03-13T00:00:00Z http://hdl.handle.net/2451/33750 Title: Archival supplement to Stimulus Dependence of Gamma Oscillations in Human Visual Cortex (2014). Authors: Hermes, Dora; Miller, Kai J; Wandell, Brian A; Winawer, Jonathan Abstract: This archive contains materials associated with the publication, Stimulus Dependence of Gamma Oscillations in Human Visual Cortex, by D. Hermes, K.J. Miller, B.A. Wandell, J. Winawer (2014), Cerebral Cortex, doi:10.1093/cercor/bhu091. The materials include data, images, and analysis code used to produce Supplementary Figure 3 in the original publication, as well as a PDF document containing answers to reader queries, and 8 new figures (Archive Figures 1-8). Thu, 03 Jul 2014 00:00:00 GMT http://hdl.handle.net/2451/33750 2014-07-03T00:00:00Z