Spectral sensitivities for illusory contour perception: a manifold linkage of chromatic and achromatic cues with the generation of contours

Takahashi, Shingo; Kaihara, Toshio; Takemoto, Atsushi; Ido, Keisuke; Ejima, Yoshimichi

doi:10.1016/0042-6989(92)90163-d

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…Similar results are found for real targets. There are indications that luminance information plays some privileged role in images involving implicit contours, namely, line-based illusory contours (Takahashi, Kaihara, Takemoto, Ido, & Ejima, 1992) and shadows (Cavanagh & Leclerc, 1989). The present results also suggest that luminance cues are necessary for color to elicit a sharp image.…”

Section: Distinctive Roles Of the Achromatic And The Chromatic Systemsupporting

confidence: 58%

A linkage of chromatic and achromatic cues in neon color effect

et al. 1994

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Neon color effect consists of two phenomenal aspects of brightness/darkness enhancement and color bleeding. The spectral properties of these two aspects were determined by threshold measurements, using the Ehrenstein pattern configuration made up of elements of different colors. The results indicate that the Ehrenstein brightness illusion is mediated by the achromatic system and the neon bleeding effect by the opponent-color system, and that both have to be present for the neon color effect to occur. It is suggested that the contribution of the chromatic system to shape analysis is contingent upon the presence of luminance cues, implying strong linkage between luminance and color processing in form perception.

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Section: Distinctive Roles Of the Achromatic And The Chromatic Systemsupporting

confidence: 58%

A linkage of chromatic and achromatic cues in neon color effect

et al. 1994

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“…It has been suggested that mechanisms based on luminance and those based on chromaticity might both contribute to IC sensitivity, with the two mechanisms operating concurrently (Takahashi et al, 1992). At present, direct neurophysiologic support for this proposal is largely lacking.…”

Section: Introductionmentioning

confidence: 93%

Cue-dependent circuits for illusory contours in humans

et al. 2016

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Objects' borders are readily perceived despite absent contrast gradients, e.g. due to poor lighting or occlusion. In humans, a visual evoked potential (VEP) correlate of illusory contour (IC) sensitivity, the "IC effect", has been identified with an onset at ~90ms and generators within bilateral lateral occipital cortices (LOC). The IC effect is observed across a wide range of stimulus parameters, though until now it always involved high-contrast achromatic stimuli. Whether IC perception and its brain mechanisms differ as a function of the type of stimulus cue remains unknown. Resolving such will provide insights on whether there is a unique or multiple solutions to how the brain binds together spatially fractionated information into a cohesive perception. Here, participants discriminated IC from no-contour (NC) control stimuli that were either comprised of low-contrast achromatic stimuli or instead isoluminant chromatic contrast stimuli (presumably biasing processing to the magnocellular and parvocellular pathways, respectively) on separate blocks of trials. Behavioural analyses revealed that ICs were readily perceived independently of the stimulus cue -i.e. when defined by either chromatic or luminance contrast. VEPs were analysed within an electrical neuroimaging framework and revealed a generally similar timing of IC effects across both stimulus contrasts (i.e. at ~90ms). Additionally, an overall phase shift of the VEP on the order of ~30ms was consistently observed in response to chromatic vs. luminance contrast independently of the presence/absence of ICs. Critically, topographic differences in the IC effect were observed over the ~110-160ms period; different configurations of intracranial sources contributed to IC sensitivity as a function of stimulus contrast. Distributed source estimations localized these differences to LOC as well as V1/V2. The present data expand current models by demonstrating the existence of multiple, cue-dependent circuits in the brain for generating perceptions of illusory contours.

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The abutting grating illusion

Soriano

Spillmann²,

Bach

1996

Vision Research

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Two line gratings abutting each other with a phase shift of half a cycle elicit the perception of an illusory line running orthogonally between the two sets of grating lines. We found that rating strength increases with increasing number of lines, line length, and phase angle. In contrast, rating strength decreases with increasing spacing of lines, lateral misalignment, rotation of one grating relative to the other, and line width. There is a pronounced oblique effect at 45 deg when the orientation of the abutting gratings is changed from horizontal through diagonal to vertical. Findings are interpreted in terms of a neurophysiological model. We conclude that the end-stopped receptive fields activated by the grating lines are about 6 deg long and 2 deg wide. On the other hand, the "response fields" of the cells, integrating orthogonally across line ends, are assumed to be 5 deg long and less than 1 deg wide. The psychophysical data compare favorably with available neurophysiological data in Area V2 of the macaque suggesting that the perception of illusory contours in human observers may be based on cortical cell properties similar to those found in the monkey.

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Spectral sensitivities for illusory contour perception: a manifold linkage of chromatic and achromatic cues with the generation of contours

Cited by 4 publications

References 33 publications

A linkage of chromatic and achromatic cues in neon color effect

A linkage of chromatic and achromatic cues in neon color effect

Cue-dependent circuits for illusory contours in humans

The abutting grating illusion

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