On Seeing Reddish Green and Yellowish Blue

Crane, Hewitt D.; Piantanida, Thomas P.

doi:10.1126/science.221.4615.1078

Cited by 132 publications

(61 citation statements)

References 11 publications

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“…The structure and specificity of RFs and of cortical functional architecture are increasingly seen as context dependent. This may represent the cellular mechanism of perceptual studies showing that the visual system is capable of linking contours and surfaces in a process of perceptual fill-in (2)(3)(4)(5)(6), that our perception of the attributes of local features is influenced by context (7)(8)(9)(10)(11)(12)(13)(14), and that simple contours can be picked out of a noisy background (15-18). The perceptual phenomena obey rules that are consonant with the patterns of connectivity in primary visual cortex, supporting the idea that a major component of the process of spatial integration occurs there.…”

mentioning

confidence: 99%

Spatial integration and cortical dynamics.

Gilbert¹,

Das²,

Ito³

et al. 1996

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

307

181

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Cells in adult primary visual cortex are capable of integrating information over much larger portions of the visual field than was originally thought. Moreover, their receptive field properties can be altered by the context within which local features are presented and by changes in visual experience. The substrate for both spatial integration and cortical plasticity is likely to be found in a plexus of long-range horizontal connections, formed by cortical pyramidal cells, which link cells within each cortical area over distances of 6-8 mm. The relationship between horizontal connections and cortical functional architecture suggests a role in visual segmentation and spatial integration. The distribution of lateral interactions within striate cortex was visualized with optical recording, and their functional consequences were explored by using comparable stimuli in human psychophysical experiments and in recordings from alert monkeys. They may represent the substrate for perceptual phenomena such as illusory contours, surface fill-in, and contour saliency. The dynamic nature of receptive field properties and cortical architecture has been seen over time scales ranging from seconds to months. One can induce a remapping of the topography of visual cortex by making focal binocular retinal lesions. Shorter-term plasticity of cortical receptive fields was observed following brief periods of visual stimulation. The mechanisms involved entailed, for the short-term changes, altering the effectiveness of existing cortical connections, and for the long-term changes, sprouting of axon collaterals and synaptogenesis. The mutability of cortical function implies a continual process of calibration and normalization of the perception of visual attributes that is dependent on sensory experience throughout adulthood and might further represent the mechanism of perceptual learning.

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mentioning

confidence: 99%

Spatial integration and cortical dynamics.

Gilbert¹,

Das²,

Ito³

et al. 1996

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

307

181

View full text Add to dashboard Cite

show abstract

“…(Crane/Piantanida1983, p. 1079. Also these subjects did not use the expression "reddish green", although they seem to have talked of perceiving one colour, which is not the same as saying that an "entire region can be perceived simultaneously as both red and green (or yellow and blue)" (Crane/Piantanida 1983, p. 1078. Since the experimenters think that these differences do not matter, I should rather be given a full record of what their subjects actually said.…”

Section: Wittgenstein On Conceptual Arbitrarinessmentioning

confidence: 99%

“…By stabilizing the retinal image of the boundary between a pair of red and green stripes (or a pair of yellow and blue stripes) but not their outer edges, however, the entire region can be perceived simultaneously as both red and green (or yellow and blue). (Crane/Piantanida 1983, p. 1078 I first want to note that it is not accurate to say that perceiving something to be of an "-ish" colour is the same as perceiving a surface as having two colours at the same time. When something is seen to be bluish green, for example, it is not blue and green at the same time.…”

Section: Wittgenstein On Conceptual Arbitrarinessmentioning

confidence: 99%

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‘Reddish Green’ – Wittgenstein on Concepts and the Limits of the Empirical

Ritter

2017

Conceptus

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A "concept" in the sense favoured by Wittgenstein is a paradigm for a transition between parts of a notational system. A concept-determining sentence such as "There is no reddish green" registers the absence of such a transition. This suggests a plausible account of what is perceived in an experiment that was first designed by Crane and Piantanida, who claim to have induced perceptions of reddish green. I shall propose a redescription of the relevant phenomena, invoking only ordinary colour concepts. This redescription is not ruled out by anything the experimenters say. It accounts for certain peculiarities in both their descriptions and their subjects', and suggests that instead of discovering forbidden colours the experimenters introduced a new use of "-ish". Still, there is a point in speaking of "reddish green" in their context, which can be motivated by invoking what Wittgenstein calls a "physiognomy".

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“…Perhaps it is a lack of imagination on our part that it might seem that something couldn't look that way. And he cites research by Crane and Piantandia (1983) in which subjects reported that objects look both red and green at the same time.…”

Section: Apparent Color Incompatibilitymentioning

confidence: 99%

Representationalism and the conceivability of inverted spectra

Thompson

2007

Synthese

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On Seeing Reddish Green and Yellowish Blue

Cited by 132 publications

References 11 publications

Spatial integration and cortical dynamics.

Spatial integration and cortical dynamics.

‘Reddish Green’ – Wittgenstein on Concepts and the Limits of the Empirical

Representationalism and the conceivability of inverted spectra

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