Search results for "Illusions"
showing 10 items of 50 documents
P072. The visual cortical excitability in pediatric migraine as tested by sound-induced flash illusions
2015
Objectives Sound-induced flash illusions (SIFI) depend on visual cortex (V1) excitability [1]. In adults with migraine, in response to visual-acoustic illusions, V1 is hyperexcitable [2]. Susceptibility to SIFI is increased in children than adults. During childhood there is a change in sensory dominance: acoustic dominant switching to a visual [3]. Here we used SIFI to evaluate V1 excitability in children with migraine assessing also age-related differences in cross-modal audio-visual perception.
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
On the interpretation of optical illusions.
1973
If excited by stimuli adjacent in space and time, the optical system frequently perceives illusions in the form of apparent movements. These effects may be attributed to the dynamic properties of the retinal nerve nets. On the basis of a specific psychophysical experiment the mechanism underlying the generation of optical illusions is interpreted by the methods of systems theory and its use in systems analysis is discussed. It is shown that for the perception of apparent movements the transit times of the signals in the dendrites are particularly important.
The illusion of contact: Insights from Winnicott’s 1952 letter to Klein
2021
Using Winnicott’s theory, this article produces an account of the individual’s relation to a given conceptual framework. Whereas Winnicott’s ideas have been almost exclusively discussed in developmental and psychopathological contexts, the present article extends Winnicott’s theory and applies it to the problem of interpersonal understanding. Taking a lead from one of Winnicott’s letters to Klein, the article investigates the problem of expressing one’s idiosyncratic insights in the confines of a given conceptual framework. The article examines Winnicott’s theory of compliance and creativity, discusses the plea that Winnicott makes to Klein, analyses the encounter with a “dead language”, an…
White Noise Speech Illusions: A Trait-Dependent Risk Marker for Psychotic Disorder?
2019
Supported by the European Community’s Seventh Framework Program under grant agreement No. HEALTH-F2-2009-241909 (Project EU-GEI)
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…
Perception of illusory surfaces and contours in goldfish
2007
Goldfish(Carassius auratus)were trained to discriminate triangles and squares using a two choice procedure. In the first experiment, three goldfish were trained with food reward on a black outline triangle on a white background, while a black outline square was shown for comparison. In transfer tests, a Kanizsa triangle and a Kanizsa square were presented, perceived by humans as an illusory triangle- or square-shaped surface of slightly higher brightness than the background. The choice behavior in this situation indicates that goldfish are able to discriminate between both figures in almost the same way as in the training situation. In control experiments goldfish did not discriminate betwe…
Sobre De somniís liber de Augerius Ferrerius
2004
E-mail @uv.es: privado (a solicitud del interesado) En este libro Ferrer, en plena época renacentista, hace compatibles las teorías oníricas de los autores griegos con sus principios y punto de vista cristianos. Niega tajantemente que existan ensueños vanos y se interesa por los ensueños naturales, cuya génesis está en el estado psicofísico del individuo. Pero, sobre todo, presta su máxima atención a los ensueños divinos. Establece normas para distinguir éstos de los enviados por los malos espíritus. Afirma que ha descubierto mediante la razón y la propia experiencia claves para la interpretación de los ensueños que los filósofos anteriores no llegaron a descubrir. In this book, published d…