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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
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 ; 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[...]texto impreso
The contrast detection threshold of a grating located in the periphery is increased if a surrounding grating of the same frequency and orientation is present. This inhibition between center and surround has been termed surround suppression. In t[...]texto impreso
Serrano Pedraza, Ignacio ; Hogg, Ellen L ; Read, Jenny C A | 2011At high contrast, duration thresholds for motion direction discrimination deteriorate with increasing stimulus size. This counterintuitive result has been explained by the center-surround antagonism present in the neurons of visual area MT. Conv[...]texto impreso
Because our eyes are set apart horizontally in our head, most disparities between the retinal images are horizontal. However, vertical disparities also occur, and can influence depth perception. The classic example is Ogle's induced effect (K. N[...]texto impreso
Serrano Pedraza, Ignacio ; Read, Jenny C A | 2009Vertical disparities influence the perception of 3D depth, but little is known about the neuronal mechanisms underlying this. One possibility is that these perceptual effects are mediated by an explicit encoding of two-dimensional disparity. Rec[...]texto impreso
Read, Jenny C A ; Phillipson, Graeme P ; Serrano Pedraza, Ignacio ; Milner, A David ; Parker, Andrew J | 2010Both dorsal and ventral cortical visual streams contain neurons sensitive to binocular disparities, but the two streams may underlie different aspects of stereoscopic vision. Here we investigate stereopsis in the neurological patient D.F., whose[...]texto impreso
Stereo vision has a well-known anisotropy: At low frequencies, horizontally oriented sinusoidal depth corrugations are easier to detect than vertically oriented corrugations (both defined by horizontal disparities). Previously, Serrano-Pedraza a[...]texto impreso
Serrano Pedraza, Ignacio ; Herbert, William ; Villa Laso, Laura ; Widdall, Michael ; Vancleef, Kathleen ; Read, Jenny C A | 2016-03-01PURPOSE Human vision has a puzzling stereoscopic anisotropy: horizontal depth corrugations are easier to detect than vertical depth corrugations. To date, little is known about the function or the underlying mechanism responsible for this anisot[...]texto impreso
Yazdani, Partow ; Serrano-Pedraza, Ignacio ; Whittaker, Roger G ; Trevelyan, Andrew ; Read, Jenny C A | Scholar One | 2015Psychophysical surround suppression is believed to reflect inhibitory neuronal mechanisms in visual cortex. In recent years, two psychophysical measures of surround suppression have been much studied: (i) duration thresholds on a motion-discrimi[...]texto impreso
Serrano Pedraza, Ignacio ; Manjunath, Vina ; Osunkunle, Olaoluwakitan ; Clarke, Michael P ; Read, Jenny C A | 2011-04PURPOSE To investigate the cortical mechanisms that prevent diplopia in intermittent exotropia (X(T)) during binocular alignment (orthotropia). METHODS The authors studied 12 X(T) patients aged 5 to 22 years. Seventy-five percent had function[...]
