Depois de conclu ID: 180113
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Arq Bras Oftalmol. 2007;70(1):101-4Preenchimento perceptual de estímulos estereoscópicos Depois de concluída a análise do arti- in latency of stereoscopically presented stimuli. Anaglyphswere created using two circular patches of 0.3º diameter, 0.5º disparity andtime elapsed for disappearance of the target under voluntary steadyfixation was computed. Eighteen subjects tested. between near or far from the vertical horopter line. The significant difference 12/03/07, 15:34101 dard error of the mean and are statistically analyzed by two- type and proximity to vertical horopter line). Two way In this study we investigated the importance of targettric studies using the artificial scotoma model indicate thatdisparity processing listed in the introduction, in our experi- or depth varia-tion from the fixation plane exert no significant effect on the investigated filling-in of a gray target at dif-Differences of visual processing between upper and lowervisual fields might explain our results. The superior retina has and in spatial memory and length judg- is enhanced in the lower visual field. Also, the EEGoccipital scalp field peak much earlier for upper than for loweral streams that begin with V1. The ventral stream projects tojudgments are required. This is interpreted as due to the activi-visual systemhance saliency of targets situated at the lower visual field andconsequently delay its fading. Near horopterFar from 70(1)32.p6512/03/07, 15:34103 Arq Bras Oftalmol. 2007;70(1):101-4104Perceptual filling-in of stereoscopically presented targets identification tasks, opposed to the advantage of lower visualprocess; these differences could be responsible for a delayedfading of a target or an object placed at the lower visual field, Investigar a influência da variação de parâmetrosestereoscópicos na latência de preenchimento perceptual deestímulos 3D. Criados anáglifos com dois discos deponto central de fixação. Estímulos foram apresentados na linhacentral do campo visual, nas posições 90º e 270º, com dispa-va entre as disparidades cruzada e não cruzada, nem entre pertoOs resultados mostram que: (i) a apresentação estereos-cópica não tem influência na latência de preenchimento per- Mascaramento perceptivo; Disparidade visual/ 1.Ramachandran VS. Blind spots. Sci Am. 1992;266(5):86-91.2.Pessoa L, Thompson E, Noe A. Finding out about filling-in: a guide to3.Ramachandran VS, Gregory RL. Perceptual filling-in of artificially induced4.De Weerd P, Desimone R, Ungerleider LG. Perceptual filling-in: a parametric5.Friedman HS, Zhou H, von der Heydt R. Color filling-in under steadyfixation: behavioral demonstration in monkeys and humans. Perception. 1999;6.Welchman AE, Harris JM. Filling-in the details on perceptual fading. Vision7.Sakaguchi Y. Target/surround asymmetry in perceptual filling-in. Vision Res.8.Welchman AE, Harris JM. Is neural filling-in necessary to explain the percep-9.Manning ML, Finlay DC, Neill RA, Frost BG. Detection threshold diffe-10.Breitmeyer B, Julesz B, Kropfl W. Dynamic random-dot sterereograms reveal11.Mustillo P. Binocular mechanisms mediating crossed and uncrossed stereop-12.Siderov J, Harweth RS, Bedell HE. Stereopsis, cyclovergence and the back-13.Ankrum DR. A Challenge to Eye-Level, Perpendicular-to-Gaze monitor place-ment. In: 13th Triennial Congress of the International Ergonomics Association.14.Previc FH. Functional specialization in the lower and upper visual fields inBrain Sci. 1990;13:519-75.15.Burian HM. Stereopsis. Doc Ophthalmol. 1951;5-6:169-83.16.Paradiso MA, Nakayama K. Brightness perception and filling-in. Vision Res.17.Motoyoshi I. Texture filling-in and texture segregation revealed by transient18.Couto MF, Brasil-Neto JP, Pessoa VF. Hemifield anisotropy for perceptualCouto MF, Brasil-Neto JP, Pessoa VF. Hemifield anisotropy for perceptualOphthalmol Vis Sci. 2003;44(5): Abstract 1918.19.Sakaguchi Y. Visual field anisotropy revealed by perceptual filling-in. VisionRes. 2003;43(19):2029-38.20.Curcio CA, Allen KA. Topography of ganglion cells in human retina. J21.Danckert J, Goodale MA. Superior performance for visually guided pointing22.Genzano VR, Di Nocera F, Ferlazzo F. Upper/lower visual field asymmetry23.Rubin N, Nakayama K, Shapley R. Enhanced perception of illusory contours24.Bilodeau L, Faubert J. Isoluminance and chromatic motion perception throu-25.Fukusima SS, Faubert J. Perceived length in the central visual field: evidencefor visual field asymmetries. Vision Res. 2001;41(16):2119-26.26.Lehman D, Meles HP, Mir Z. Average multichannel EEG potential fields27.Previc FH, Naegele PD. Target-tilt and vertical-hemifield asymmetries in free-28.Goodale MA, Milner AD. Separate visual pathways for perception and action.29.Sdoia S, Couyoumdjian A, Ferlazzo F. Opposite visual field asymmetries foregocentric and allocentric spatial judgments. Neuroreport. 2004;15(8):1303-5. 12/03/07, 15:34104