Search results for "visual illusions"
showing 4 items of 4 documents
The ⊥-Illusion Is Not a T-Illusion
2020
Variants of the capital Latin letter T were prepared with the straight strokes replaced by J-, C-, or S-curves, mimicking handwritten Ts. These were used to test the hypothesis that the overestimation of the length of the T&rsquo
Cortical excitability changes in chronic migraine vs episodic migraine: evidence by sound-induced flash illusions
2014
Introduction: Sound-induced flash illusions(SIFI) permit to evaluate crossmodal audio-visual perception. When one flash is accompanied by two beeps, it is perceived as two flashes(’fission’illusion); a ‘fusion’ illusion occurs when a single beep causes the fusion of a double flash stimulus. SIFI strictly depends on cortical excitability: healthy controls perceive less illusions by increasing visual cortex excitability through anodal tDCS [1]. Aim: to evaluate if, due to cortical hyperexcitability, differences in SIFI occur in migraine and further changes can be found across migraine cycle, migraine chronification an drug overuse. Methods: we enrolled 64 patients with episodic migraine, 32 w…
Paradox lost: variable colour-pattern geometry is associated with differences in movement in aposematic frogs
2014
Aposematic signal variation is a paradox: predators are better at learning and retaining the association between conspicuousness and unprofitability when signal variation is low. Movement patterns and variable colour patterns are linked in non-aposematic species: striped patterns generate illusions of altered speed and direction when moving linearly, affecting predators' tracking ability; blotched patterns benefit instead from unpredictable pauses and random movement. We tested whether the extensive colour-pattern variation in an aposematic frog is linked to movement, and found that individuals moving directionally and faster have more elongated patterns than individuals moving randomly and…
Design Anamorphosis in Math Class
2015
Many visual effects are based on mathematical, geometrical procedures. Creating visual illusions through playful activities hold exciting pedagogical opportunities for raising students’ interest towards mathematics and the technical aspects of visual arts. The Experience Workshop Math-Art Movement has a number of thematic workshops — developed through interdisciplinary collaborations between mathematics teachers, artists and scholars — that are connected to perspective illusions and visual paradoxes. In this paper we introduce classroom activities focusing on mathematical connections in anamorphosis, drawing inspiration from István Orosz’s anamorphic art. peerReviewed