The accessibility of spatial channels for stereo and motion

Authors: Hess, R.F., Wang, Y.Z. and Liu, C.H.

Journal: Vision Research

Volume: 46

Issue: 8-9

Pages: 1318-1326

ISSN: 0042-6989

DOI: 10.1016/j.visres.2005.10.029

Abstract:

Using fractal noise images, we measured the dependence of D on the spatial passband (spatial frequency and orientation) over which information was correlated either between the eyes for stereo or between sequential frames for motion. Without affecting the amplitude spectrum of the noise stimulus we used idealized filters to scramble the phase of components outside a pre-defined passband. Using a simple Gaussian model in which performance depends on the signal/noise within a restricted spatial region, we obtained estimates of the bandwidth of the narrowest underlying spatial frequency and orientation spectral region subserving these two comparable tasks. Spatial bandwidths varied with peak spatial frequency but were very broad approximating the spectrum of the stimulus itself. Orientation properties of the underlying mechanisms were isotropic. These results suggest that the independent activity of individual narrowband spatial channels is not perceptually accessible for these tasks. min

Source: Scopus

The accessibility of spatial channels for stereo and motion.

Authors: Hess, R.F., Wang, Y.-Z. and Liu, C.H.

Journal: Vision Res

Volume: 46

Issue: 8-9

Pages: 1318-1326

ISSN: 0042-6989

DOI: 10.1016/j.visres.2005.10.029

Abstract:

Using fractal noise images, we measured the dependence of D(min) on the spatial passband (spatial frequency and orientation) over which information was correlated either between the eyes for stereo or between sequential frames for motion. Without affecting the amplitude spectrum of the noise stimulus we used idealized filters to scramble the phase of components outside a pre-defined passband. Using a simple Gaussian model in which performance depends on the signal/noise within a restricted spatial region, we obtained estimates of the bandwidth of the narrowest underlying spatial frequency and orientation spectral region subserving these two comparable tasks. Spatial bandwidths varied with peak spatial frequency but were very broad approximating the spectrum of the stimulus itself. Orientation properties of the underlying mechanisms were isotropic. These results suggest that the independent activity of individual narrowband spatial channels is not perceptually accessible for these tasks.

Source: PubMed

Preferred by: Changhong Liu

The accessibility of spatial channels for stereo and motion

Authors: Hess, R.F., Wang, Y.Z. and Liu, C.H.

Journal: VISION RESEARCH

Volume: 46

Issue: 8-9

Pages: 1318-1326

ISSN: 0042-6989

DOI: 10.1016/j.visres.2005.10.029

Source: Web of Science (Lite)

The accessibility of spatial channels for stereo and motion.

Authors: Hess, R.F., Wang, Y.-Z. and Liu, C.H.

Journal: Vision research

Volume: 46

Issue: 8-9

Pages: 1318-1326

eISSN: 1878-5646

ISSN: 0042-6989

DOI: 10.1016/j.visres.2005.10.029

Abstract:

Using fractal noise images, we measured the dependence of D(min) on the spatial passband (spatial frequency and orientation) over which information was correlated either between the eyes for stereo or between sequential frames for motion. Without affecting the amplitude spectrum of the noise stimulus we used idealized filters to scramble the phase of components outside a pre-defined passband. Using a simple Gaussian model in which performance depends on the signal/noise within a restricted spatial region, we obtained estimates of the bandwidth of the narrowest underlying spatial frequency and orientation spectral region subserving these two comparable tasks. Spatial bandwidths varied with peak spatial frequency but were very broad approximating the spectrum of the stimulus itself. Orientation properties of the underlying mechanisms were isotropic. These results suggest that the independent activity of individual narrowband spatial channels is not perceptually accessible for these tasks.

Source: Europe PubMed Central

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