Intermittent stimulation of binocular disparatecolors and central color fusion

Onot, Hiroshi; Komoda, Melvin K.; Mueller, Eberhard R.

doi:10.3758/bf03212662

Cited by 9 publications

(8 citation statements)

References 16 publications

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“…In the scanner, the two monocular stimuli were presented simultaneously by using repetitive (Ϸ50-ms) ON flashes, separated by (Ϸ150-ms) OFF intervals, during which only the frame and fixation cross were visible. Continuous fusion (instead of binocular rivalry) was thus achieved (13). Each stimulus train was presented for 1.5 s, followed by a 1.5-s rest period (frame and cross still visible), during which subjects reported their percept by pressing one of three buttons: ''face,'' ''house,'' or ''nothing.''…”

Section: Methodsmentioning

confidence: 99%

“…If a red square is flashed in one eye and an identical green square in the corresponding retinal location of the other eye, a yellow square will be perceived. To achieve continuous red͞green fusion and thus continuous perception of the yellow square, repetitive brief flashes (Ͻ100 ms) separated by longer (Ͼ100 ms) nonstimulation intervals can be used (13). Based on this principal, we developed a method by which any two-colored image that is clearly recognizable when the stimuli to the two eyes are identical can be made ''invisible'' when the color contrast in one eye is reversed.…”

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confidence: 99%

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The relationship between cortical activation and perception investigated with invisible stimuli

Moutoussis

Zeki

2002

Proc. Natl. Acad. Sci. U.S.A.

249

164

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The aim of this work was to study the relationship between cortical activity and visual perception. To do so, we developed a psychophysical technique that is able to dissociate the visual percept from the visual stimulus and thus distinguish brain activity reflecting the perceptual state from that reflecting other stages of stimulus processing. We used dichoptic color fusion to make identical monocular stimuli of opposite color contrast ''disappear'' at the binocular level and thus become ''invisible'' as far as conscious visual perception is concerned. By imaging brain activity in subjects during a discrimination task between face and house stimuli presented in this way, we found that house-specific and facespecific brain areas are always activated in a stimulus-specific way regardless of whether the stimuli are perceived. Absolute levels of cortical activation, however, were lower with invisible stimulation compared with visible stimulation. We conclude that there is no terminal ''perceptual'' area in the visual brain, but that the brain regions involved in processing a visual stimulus are also involved in its perception, the difference between the two being dictated by a higher level of activity in the specific brain region when the stimulus is perceived.

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

The relationship between cortical activation and perception investigated with invisible stimuli

Moutoussis

Zeki

2002

Proc. Natl. Acad. Sci. U.S.A.

249

164

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“…The viewing conditions employed by Ono, Komoda, and Mueller (1971) to produce binocular color mixture were used to ensure that the dichoptically presented color and contour material were viewed without binocular rivalry. They found that different colors simultaneously presented to each eye for no longer than 100 msec on each occasion resulted in binocular color mixture, but that with longer exposure there was binocular rivalry.…”

Section: Experiments Imentioning

confidence: 99%

Absence of binocular interaction between spatial and color attributes of visual stimuli

Over

Long

Lovegrove

1973

Perception & Psychophysics

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The hypothesis that induction of the 'fcCollough effect (spatially selective color aftereffects) entails adaptation of monocularly driven detectors tuned to both spatial and color attributes of the visual stimulus was examined in four experiments. The 'fcCollough effect could' not be generated by displaying contour information to one eve and color information to the other eye during inspection, even in the absence of binocular rivalry. Nor was it possible to induce depth-specific color aftereffects following an inspection period during which random-dot stereozrams were viewed. with crossed and uncrossed disparity seen in different colored light. "asking and aftereffect in the perception of stereoscopic depth were also nonselective to color; in both cases, perceptual distortion was controlled by stereospatial variables but not by the color relationship between the inspection and test stimuli. The results suggest that binocularly driven sparial detectors in human vision are insensitive to wavelength.There is now extensive psychophysical evidence suggesting that at least some detection mechanisms in human vision are responsive to both color and spatial attributes of the visual stimulus. In the initial study, McCollough (I965) found that orientation-specific color aftereffects could be induced by displaying alternately a horizontal grating in blue light and a vertical grating in orange light. When the gratings were subsequently viewed in white light, Ss reported that horizontal lines appeared orange and vertical lines looked blue. fcCollough attributed these aftereffects to selective adaptation of neural detectors tuned to both orientation and wavelength. The assumption is that there are separate detectors for orange-vertical and blue-vertical lines, and defectors excited during the inspection period are suppressed for a period of time afterwards. The vertical test lines presented in white light are normally signaled by the relative response level of orange-vertical and blue-vertical detectors, but appear colored following inspection because one class of detector is in an adapted state. Color aftereffects that are specific to image motion (Hepler, 1968: Stromeyer & Mansfield, 1970 and spatial periodicity (Breitmeyer & Cooper, 1972: Stromeyer, 1972 have been explained in similar terms.Spatially linked color aftereffects (subsequently referred to as the McCollough effect) can be induced with either monocular or binocular inspection. However, the McCollough effect is not obtained when adaptation stimuli are viewed by one eye and test stimuli by the other eye (McCollough, 1965: Hepler, 1968: Murch, 1969Stromeyer & Mansfield, 1970). Such data suggest "This study was supported by an award from the Australian Research Grants Committee. We thank Jack Broerse and Ann Marie Parker for their assistance in data collection.-;-Requests for reprints should be sent to Ray Over. Department of Psychology, University of Queensland, St. Lucia. Australia 4067. that neural detectors tuned to both color and spatial attributes have exclusi...

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“…In past studies without such anchoring, all three observers of Ono, et al (1971) reported that their subjective definitions of red and green changed across trials, and even Hurvich and Jameson reported that their subjective definitions of pure green differed from the outset. In past studies without such anchoring, all three observers of Ono, et al (1971) reported that their subjective definitions of red and green changed across trials, and even Hurvich and Jameson reported that their subjective definitions of pure green differed from the outset.…”

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confidence: 99%

Is Binocular Fusion of “Cortical Yellow” an Illusion, Contingent upon Abstraction of Coherent Sensory Information from the Two Eyes?

Kunzendorf

2007

Percept Mot Skills

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This research on the binocular fusion of phenomenal yellow, given red-filtered flashes of light in one eye and green-filtered flashes of light in the other, directly compared the effects of wider-bandwidth and narrow-bandwidth filtering. 20 male college students with normal stereopsis, Mage = 19.3 yr., SD = 2.2, were tested for the binocular perception of flashing yellow sensations given wider-bandwidth versus narrow-bandwidth filtering of light flashes which, monocularly, were experienced as red sensations in one eye and as green sensations in the other. When 3 wide-bandwidth tests for binocular yellow fusion were alternated with 3 narrow-bandwidth tests, simultaneous flashes of red-filtered light in one eye and green-filtered light in the other were binocularly perceived as yellowish on 25% of the wide-bandwidth tests (SD = 40%)--as yellow on 8% of the tests, orange on 12% of the tests, yellow-green on 5% of the tests-and were binocularly perceived as yellowish on 0% of the narrow-bandwidth tests. When wider-bandwidth and narrow-bandwidth testing were separated spatially and conducted contemporaneously, the red-filtered flashes in one eye and green-filtered flashes in the other were binocularly experienced as yellowish sensations by 80% of all participants under wider-bandwidth conditions--as yellow by 55%, orange by 10%, yellow-green by 15%--and as yellowish sensations by 0% of the participants under narrow-bandwidth conditions.

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Intermittent stimulation of binocular disparatecolors and central color fusion

Cited by 9 publications

References 16 publications

The relationship between cortical activation and perception investigated with invisible stimuli

The relationship between cortical activation and perception investigated with invisible stimuli

Absence of binocular interaction between spatial and color attributes of visual stimuli

Is Binocular Fusion of “Cortical Yellow” an Illusion, Contingent upon Abstraction of Coherent Sensory Information from the Two Eyes?

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