2026-06-27T16:03:30Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/994412025-03-18T16:06:10Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Arranz Paraíso, Sandra author Read, Jenny C. A. author Serrano Pedraza, Ignacio 2024-02-06T12:00:26Z 2024-02-06T12:00:26Z 2021-01-04 10.1167/jov.21.1.10 https://hdl.handle.net/20.500.14352/99441 https://jov.arvojournals.org/article.aspx?articleid=2772200#:~:text=Therefore%2C%20surround%20suppression%20is%20reduced,et%20al.%2C%202005). Motion discrimination of large stimuli is impaired at high contrast and short durations. This psychophysical result has been linked with the center-surround suppression found in neurons of area MT. Recent physiology results have shown that most frontoparallel MT cells respond more strongly to binocular than to monocular stimulation. Here we measured the surround suppression strength under binocular and monocular viewing. Thirty-nine participants took part in two experiments: (a) where the nonstimulated eye viewed a blank field of the same luminance (n = 8) and (b) where it was occluded with a patch (n = 31). In both experiments, we measured duration thresholds for small (1 deg diameter) and large (7 deg) drifting gratings of 1 cpd with 85% contrast. For each subject, a Motion Suppression Index (MSI) was computed by subtracting the duration thresholds in logarithmic units of the large minus the small stimulus. Results were similar in both experiments. Combining the MSI of both experiments, we found that the strength of suppression for binocular condition (MSIbinocular = 0.249 ± 0.126 log10 (ms)) is 1.79 times higher than under monocular viewing (MSImonocular = 0.139 ± 0.137 log10 (ms)). This increase is too high to be explained by the higher perceived contrast of binocular stimuli and offers a new way of testing whether MT neurons account for surround suppression. Potentially, differences in surround suppression reported in clinical populations may reflect altered binocular processing. eng Attribution-NonCommercial-NoDerivatives 4.0 International Reduced surround suppression in monocular motion perception journal article 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URL https://docta.ucm.es/bitstreams/ebc33e64-8042-4795-9d3d-7a419c89123a/download File MD5 3028009807faf5f740b9849d5ee8334f 702164 application/pdf reduced ss monocular paper.pdf URL https://docta.ucm.es/bitstreams/98c56dbb-3f54-4f3c-b0b6-b54eb037d4f0/download File MD5 0b4ec6b6dde3bc35776b958ae2b990a9 76874 text/plain reduced ss monocular paper.pdf.txt