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The perceived direction of motion of a brief visual stimulus that contains fine features reverses if static coarser features are added to it. Here we show that the reversal in perceived direction disappears if the stimulus is reduced in size fro[...]texto impreso
Chacón Gómez, José ; Castellanos López, Miguel Ángel ; Serrano Pedraza, Ignacio | Scholar One | 2015-12-01Previous research has shown a visual asymmetry in shaded stimuli where the perceived contrast depended on the polarity of their dark and light areas (Chacón, 2004). In particular, circles filled out with a top-dark luminance ramp were perceived [...]texto impreso
Serrano Pedraza, Ignacio ; Gamonoso Cruz, María J ; Sierra Vázquez, Vicente ; Derrington, Andrew M | Scholar One | 2013Our ability to discriminate motion direction in a Gabor patch diminishes with increasing size and contrast, indicating surround suppression. Discrimination is also impaired by a static low-spatial-frequency patch added to the moving stimulus, su[...]texto impreso
Jameson, Simon S ; Dowen, Daniel ; James, Philip ; Serrano Pedraza, Ignacio ; Reed, Mike R ; Deehan, David | 2012-01Unlike the English National Joint Registry (NJR) for arthroplasty, no surgeon driven national database currently exists for ligament surgery in England. Therefore information on outcome and adverse events following anterior cruciate ligament (AC[...]texto impreso
Serrano Pedraza, Ignacio ; Sierra Vázquez, Vicente ; López Bascuas, Luis Enrique ; Campos Bueno, José Javier ; Luna del Valle, Raul ; Arranz Paraíso, Sandra | 2017El resultado de este Proyecto de Innovación Docente consta de doce programas en Matlab con más de cien funcionalidades. Cinco programas están dedicados a demonstraciones para el estudio del sistema auditivo humano, seis están dedicados al estud[...]texto impreso
The role of different spatial frequency bands on face gender and expression categorization was studied in three experiments. Accuracy and reaction time were measured for unfiltered, low-pass (cut-off frequency of 1 cycle/deg) and high-pass (cuto[...]texto impreso
Early visual processing analyses fine and coarse image features separately. Here we show that motion signals derived from fine and coarse analyses are combined in rather a surprising way: Coarse and fine motion sensors representing the same dire[...]texto impreso
Read, Jenny C A ; Vaz, Xavier A ; Serrano Pedraza, Ignacio | 2011A pioneering study by J. M. Harris and A. J. Parker (1995) found that disparity judgments using random-dot stereograms were better for stimuli composed of mixed bright and dark dots than when the dots were all bright or all dark. They attribute [...]texto impreso
Serrano Pedraza, Ignacio ; Sierra Vázquez, Vicente ; Arranz Paraíso, Sandra ; Luna del Valle, Raul ; López Bascuas, Luis Enrique ; Campos Bueno, José Javier | 2020-04-30El resultado del Proyecto consta de 15 programas en Matlab con más de cien funcionalidades. Ocho están dedicados a demostraciones para el estudio del Sistema Auditivo humano (e.g. diferentes tipos de espectrogramas, Transformadas Wavelet, el fil[...]texto impreso
Alorda, Catalina ; Serrano Pedraza, Ignacio ; Campos Bueno, José Javier ; Sierra Vázquez, Vicente ; Montoya, Pedro | Elsevier | 2007-11-05Recent research on affective processing has suggested that low spatial frequency information of fearful faces provide rapid emotional cues to the amygdala, whereas high spatial frequencies convey fine-grained information to the fusiform gyrus, r[...]texto impreso
Read, Jenny C A ; Georgiou, Renos ; Brash, Claire ; Yazdani, Partow ; Whittaker, Roger ; Trevelyan, Andrew J ; Serrano Pedraza, Ignacio | Scholar One | 2015A well-studied paradox of motion perception is that, in order to correctly judge direction in high-contrast stimuli, subjects need to observe motion for longer in large stimuli than in small stimuli. This effect is one of several perceptual effe[...]texto impreso
Serrano Pedraza, Ignacio ; Read, Jenny C A | 2010Stereo vision displays a well-known anisotropy: disparity-defined slant is easier to detect for rotations about a horizontal axis than about a vertical axis, and low-frequency sinusoidal depth corrugations are easier to detect when the corrugati[...]texto impreso
Serrano Pedraza, Ignacio ; Sierra Vázquez, Vicente ; Derrington, Andrew M | Optical Society of America | 2013-06In the study of the spatial characteristics of the visual channels, the power spectrum model of visual masking is one of the most widely used. When the task is to detect a signal masked by visual noise, this classical model assumes that the sign[...]texto impreso
Esta Tesis estudia el mecanismo visual implicado en el procesamiento de imágenes cuyas características no son accesibles a los canales o filtros del mecanismo de primer orden propuestos por la teoría multicanal. Esas imágenes se han denominado e[...]texto impreso
Serrano Pedraza, Ignacio ; Romero Ferreiro, Verónica ; Read, Jenny C A ; Diéguez Risco, Teresa ; Bagney, Alexandra ; Caballero González, Montserrat ; Rodríguez Torresano, Javier ; Rodriguez Jimenez, Roberto | Frontiers Research Foundation | 2014Visual perception in schizophrenia is attracting a broad interest given the deep knowledge that we have about the visual system in healthy populations. One example is the class of effects known collectively as visual surround suppression. For ex[...]
