Texture segregation based on two-dimensional relative phase differences in composite sine-wave grating patterns

Hofmann, Martin I.; Hallett, Peter

doi:10.1016/0042-6989(93)90160-x

Cited by 11 publications

(6 citation statements)

References 43 publications

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“…This explanation could also be responsible for the small lower field advantage reported for a similar texture segregation task with both simple and complex texture channels (Graham, Rico, Offen, & Scott, 1999). However, when the target appears along only the VM (10º eccentricity) in a similar segregation task, the asymmetry is more pronounced (Hofmann & Hallett, 1993). Thus, these inconsistent findings could be explained by the specific location where the target appeared in the visual fields; when they are restricted to the VM, the asymmetry is more pronounced.…”

Section: Discussionmentioning

confidence: 84%

Vertical meridian asymmetry in spatial resolution: Visual and attentional factors

Talgar

Carrasco

2002

Psychonomic Bulletin & Review

168

224

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Section: Discussionmentioning

confidence: 84%

Vertical meridian asymmetry in spatial resolution: Visual and attentional factors

Talgar

Carrasco

2002

Psychonomic Bulletin & Review

168

224

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“…The spatial property and interaction across visual fields have also been extensively examined. For example, several studies revealed better visual performance (Hofmann & Hallett, 1993;Talgar & Carrasco, 2002) and finer attentional resolution in the lower compared with upper visual field (He et al, 1996(He et al, , 1997Intriligator & Cavanagh, 2001). Another well-established property of crowding is the radial-tangential asymmetry (Chambers & Wolford, 1983;Toet & Levi, 1992).…”

Section: Introductionmentioning

confidence: 99%

Horizontal and vertical asymmetry in visual spatial crowding effects

Feng

Jiang

2007

Journal of Vision

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The crowding effect is a ubiquitous phenomenon in spatial perception that has been extensively investigated. A notable property of spatial crowding is the radial and tangential asymmetry in which crowding is much more severe for items arranged on a radial line originating from the fixation point compared with items arranged tangentially with regard to the fixation point. Here, we report another asymmetric property of the crowding effect between horizontally and vertically arranged spatial layouts. In multiple experiments using a number of different stimulus patterns (e.g., letter Cs, letter Ts, and parallel/nonparallel line segments), results consistently showed that the crowding effect was significantly stronger when the target and distractors were horizontally rather than vertically arranged. Such a horizontal versus vertical asymmetry was found in all four quadrants of visual space. Importantly, a further visual acuity test did not reveal a horizontal versus vertical asymmetric effect.

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“…A second stage offiltering, combining spatially nearby filter responses, has also been psychophysically supported (Cannon & Fullenkamp, 1991;Chubb, Sperling, & Solomon, 1989;Rubenstein & Sagi, 1993;Sagi & Hochstein, 1985). More recently, relative phase information (both one and two dimensional) between neighboring textures has been shown to be a critical property for discrimination (Hoffman & Hallett, 1993). Filters can also model this behavior, because even and odd filters can encode both phase and energy properties.…”

mentioning

confidence: 99%

Preattentive texture segmentation: The role of line terminations, size, and filter wavelength

Rubenstein

Sagi

1996

Perception & Psychophysics

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The L1 /~texel pair represents a dilemma in texture discrimination because, despite having the same component orientations, discrimination is still possible (Julesz, 1981), showing a performance asymmetry. Other possible element properties that could influence this task are line terminations, closure, and the size of these elements. Wefound that line terminators are critical for the task; however, results from double-task experiments indicated that terminator-based discrimination requires the use of attention. When attention is not available for the task, "size" of the elements (with the~considered slightly larger) seems to be critical for this discrimination and for the asymmetric performance. Thgeneralize the concept of "size" to textures in general, further experiments were performed with textures of different-sized elements. Results showed, as past literature has indicated, that there is a performance asymmetry, with the larger of the elements being more visible when in the foreground. This asymmetry was additionally shown to reverse itself (i.e., the smaller element became the more visible) as the scale of the elements increased (while interelement distance remained fixed). A filter analysis was developed in order to measure the apparent size of these elements within textures (texsize), defined as the response weighted average of the filter wavelength, X, for a group of elements. The calculation of Xwas attained by introducing a nonlinearity after the second stage of flltering (or spatial averaging of filter responses). This analysis showed high correlation between the texture with the larger Xand the more visible texture. On the basis of this correlation, a wavelength-dependent noise is proposed, having more internal noise for low-spatial-frequency filters and less for high-spatial-frequency filters, An early attempt to explain texture discrimination was based on determining joint probability distributions of two luminance levels (Julesz, Gilbert, Frisch, & Schepp, 1973). It was shown that, although regions with iso-first-order statistics (luminance) could be easily discriminated, those with expected iso-second-order statistics (energy) could not. Later, many counterexamples were discovered (such as the LI/ IL pair), and consequently, Julesz (1981, 1984, 1986) developed the texton theory to define stimulus features that could give rise to spontaneous discrimination. These features (textons) included blob-like objects having particular orientations, lengths, widths, color, and intensity, with discrimination possible for adjacent texture regions differing in the density ofthese textons. This approach to understanding global luminance structure seemed well correlated with psychophysical results of texture discrimination tasks; however, it provided little intuition as to how such primitives could be extracted from arbitrary or natural images.An alternative theory purported that properties defining a region's homogeneity could be estimated using spatially localized operators, like those of the early visual sy...

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Texture segregation based on two-dimensional relative phase differences in composite sine-wave grating patterns

Cited by 11 publications

References 43 publications

Vertical meridian asymmetry in spatial resolution: Visual and attentional factors

Vertical meridian asymmetry in spatial resolution: Visual and attentional factors

Horizontal and vertical asymmetry in visual spatial crowding effects

Preattentive texture segmentation: The role of line terminations, size, and filter wavelength

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