Universidad Complutense de Madrid
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Spatial non-homogeneity of the antagonistic surround in motion perception.

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Serrano Pedraza, Ignacio y Hogg, Ellen L y Read, Jenny C A (2011) Spatial non-homogeneity of the antagonistic surround in motion perception. Journal of vision, 11 (2). ISSN 1534-7362

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URL Oficial: http://dx.doi.org/10.1167/11.2.3




Resumen

At 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. Conversely, at very low contrast, direction discrimination improves with increasing size, a result that has been explained by spatial summation. In this investigation, we study the effects of stimulus shape and contrast on center-surround antagonism. Using adaptive Bayesian staircases, we measured duration thresholds of 5 subjects for vertically oriented Gabor patches of 1 cycle/deg with two types of oval Gaussian windows, one vertically elongated (Sx = 0.35, Sy = 2.5 deg) and other horizontally elongated (Sx = 2.5, Sy = 0.35 deg) moving rightward or leftward at a speed of 2 deg/s. We found that at high contrast (92%) duration thresholds were lower for vertically than horizontally elongated windows. However, at low contrast (2.8%), we found that duration thresholds were lower for horizontally than vertically elongated windows. These asymmetric results mirror the spatial non-homogeneity of the antagonistic surround found in MT neurons and suggest that the underlying center-surround antagonism is stronger along the direction of motion.


Tipo de documento:Artículo
Palabras clave:Motion perception, Center–surround antagonism, Surround suppression, Spatial summation, MT neurons
Materias:Ciencias Biomédicas > Psicología > Psicología experimental
Ciencias Biomédicas > Psicología > Percepción
Ciencias Biomédicas > Óptica y optometría > Óptica oftálmica
Código ID:36286
Depositado:11 Abr 2016 16:08
Última Modificación:20 Abr 2016 14:31

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