Lighting, backlighting and watercolor illusions and the laws of figurality

Pinna, Baingio; Reeves, Adam

doi:10.1163/156856806776923434

Cited by 35 publications

(30 citation statements)

References 24 publications

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“…Results showed that color spreading could be observed at all background luminances (Pinna et al, 2001; Pinna and Reeves, 2006). Moreover, the results revealed an important interaction between the contour luminances and the background luminance, which can be more clearly seen in the results of color direction analysis in Figures 6A,B.…”

Section: Resultsmentioning

confidence: 98%

Assimilative and non-assimilative color spreading in the watercolor configuration

Kimura¹,

Kuroki²

2014

Front. Hum. Neurosci.

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A colored line flanking a darker contour will appear to spread its color onto an area enclosed by the line (watercolor effect). The watercolor effect has been characterized as an assimilative effect, but non-assimilative color spreading has also been demonstrated in the same spatial configuration; e.g., when a black inner contour (IC) is paired with a blue outer contour (OC), yellow color spreading can be observed. To elucidate visual mechanisms underlying these different color spreading effects, this study investigated the effects of luminance ratio between the double contours on the induced color by systematically manipulating the IC and the OC luminance (Experiment 1) as well as the background luminance (Experiment 2). The results showed that the luminance conditions suitable for assimilative and non-assimilative color spreading were nearly opposite. When the Weber contrast of the IC to the background luminance (IC contrast) was smaller in size than that of the OC (OC contrast), the induced color became similar to the IC color (assimilative spreading). In contrast, when the OC contrast was smaller than or equal to the IC contrast, the induced color became yellow (non-assimilative spreading). Extending these findings, Experiment 3 showed that bilateral color spreading, i.e., assimilative spreading on one side and non-assimilative spreading on the other side, can also be observed in the watercolor configuration. These results suggest that the assimilative and the non-assimilative spreading were mediated by different visual mechanisms. The properties of the assimilative spreading are consistent with the model proposed to account for neon color spreading (Grossberg and Mingolla, 1985) and extended for the watercolor effect (Pinna and Grossberg, 2005). However, the present results suggest that additional mechanisms are needed to account for the non-assimilative color spreading.

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Section: Resultsmentioning

confidence: 98%

Assimilative and non-assimilative color spreading in the watercolor configuration

Kimura¹,

Kuroki²

2014

Front. Hum. Neurosci.

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“…Given two adjacent contours as in the watercolor illusion, the one with the higher luminance contrast in relation to the surrounding regions is seen as the boundary contours of the object, while the contour with the lower luminance contrast is seen as the color of the figure [12][13][14]. In more general terms, the assignment of the role is due to the relative contrast between the two adjacent contours.…”

Section: J Imaging 2018 4 X For Peer Reviewmentioning

confidence: 99%

Illusion and Illusoriness of Color and Coloration

2018

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Abstract:In this work, through a phenomenological analysis, we studied the perception of the chromatic illusion and illusoriness. The necessary condition for an illusion to occur is the discovery of a mismatch/disagreement between the geometrical/physical domain and the phenomenal one. The illusoriness is instead a phenomenal attribute related to a sense of strangeness, deception, singularity, mendacity, and oddity. The main purpose of this work is to study the phenomenology of chromatic illusion vs. illusoriness, which is useful for shedding new light on the no-man's land between "sensory" and "cognitive" processes that have not been fully explored. Some basic psychological and biological implications for living organisms are deduced.

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“…However, you can still see the contrast with its background. It still looks like a "light square" to us, an instance of Pinna's "water colour illusion" (Pinna, 2008;Pinna, Brellstaff, & Spillmann, 2001;Pinna & Deiana, 2015;Pinna & Reeves, 2006;Pinna, Spillmann, & Werner, 2003). …”

Section: The Whole and Its Parts I: Filling The Blackboardmentioning

confidence: 99%

Plerosis and Atomic Gestalts

2017

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SummaryFranz Brentano, 1838–1917, introduced the intriguing concept of “plerosis” in order to account for aspects of the continuum that were “explained” by formal mathematics in ways that he considered absurd from the perspective of intuition, especially visual awareness and imagery. In doing this, he pointed in directions later developed by the Dutch mathematician Luitzen Brouwer. Brentano’s notion of plerosis involves distinct though coincident points, which one might call “atomic entities with parts”. This notion fits the modern concepts of “receptive field” in neurophysiology, “perceptive field” in psychology and “differential operator” in the formal theory of scale space. We identify Brentano’s boundary points as the primordial atomic Gestalts of visual imagery. The concept deserves to play a key role in Gestalt theory.

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Lighting, backlighting and watercolor illusions and the laws of figurality

Cited by 35 publications

References 24 publications

Assimilative and non-assimilative color spreading in the watercolor configuration

Assimilative and non-assimilative color spreading in the watercolor configuration

Illusion and Illusoriness of Color and Coloration

Plerosis and Atomic Gestalts

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