Search results for "illusion"

Proprioception but not cardiac interoception is related to the rubber hand illusion

2020

The rubber hand illusion (RHI) is a widely used tool in the study of multisensory integration. It develops as the interaction of temporally consistent visual and tactile input, which can overwrite proprioceptive information. Theoretically, the accuracy of proprioception may influence the proneness to the RHI but this has received little research attention to date. Concerning the role of cardioceptive information, the available empirical evidence is equivocal. The current study aimed to test the impact of proprioceptive and cardioceptive input on the RHI. 60 undergraduate students (32 females) completed sensory tasks assessing proprioceptive accuracy with respect to the angle of the elbow jo…

Bernard E. Harcourt, The Illusion of Free Markets; Punishment and the Myth of Natural Order (Cambridge: Harvard University Press, 2011), pp. 336, $29…

2015

The Oppel-Kundt Illusion and Its Relation to Horizontal-Vertical and Oblique Effects.

2021

The Oppel–Kundt illusion consists in the overestimation of the length of filled versus empty extents. Two experiments explored its relation to the horizontal-vertical illusion, which consists in the overestimation of the length of vertical versus horizontal extents, and to the oblique effect, which consists in poorer discriminative sensitivity for obliquely as opposed to horizontally or vertically oriented stimuli. For Experiment 1, Kundt’s (1863) original stimulus was rotated in steps of 45° full circle around 360°. For Experiment 2, one part of the stimulus remained at a horizontal or vertical orientation, whereas the other part was tilted 45° or 90°. The Oppel–Kundt illusion was at its …

Imagination and Körperzustand: illusion and play in Moses Mendelssohn’s aesthetic reflection

2022

The aesthetic reflection in the eighteenth century is deeply traversed by an experience perceived as capable of disrupting the disciplinary and cognitive system of early modernity: To feel the “own body,” that is, to feel its state of well-being or discomfort means to somehow modify from the inside the anthropological project of the Century of Enlightenment and to create the space and the lexicon of a modality of relationship (play, aesthetic illusion) that redefines the relationship with oneself and the context of construction of a future community. Whereas “Knowledge” and “Will” articulate the same strategy based on the relationship between the spiritual activity of a subject and the semi…

Visually produced locomotion in an autokinetic setup.

1987

On individual ttials, 15 subjects stood G m before a minicomputer screen displaying a colon in a completely darkened room Subjects were aware that the light source wzs stationary. They were instructed to fixate the colon and to perform nonlocomotive jogging in place for 2 min. and continuously to report their sensations. Room lights were turned on after 30 sec., and subjects' deviations from their starting places were measured. All subjects had moved toward the light source (M = 4.42 m, SD = .43) although they were convinced that they had not moved. Instead, they had reported either the light source approached them or the light source became larger and/or more intense. On a second trial, su…

Dowsing from the Late Middle Ages to the Twentieth Century: The Practices, Uses and Interpretations of an Element of European Magic

2012

Dowsing was an element of European folk magic. With the help of simple wooden rods persons with special magical abilities were supposed to be able to find hidden objects, from buried treasures to subterranean springs. The rise of dowsing can be traced to its use in the emerging mining centres of Central Europe around 1500. However, dowsers soon claimed nearly universal magical knowledge. Even though dowsing encountered strong scepticism, a number of early modern scholars and scientists tried to explain the alleged efficacy of the rod in a number of different ways, ranging from demonological arguments to the atom theory, and the idea of an all-encompassing world spirit. From the eighteenth …

Walter Greiner, a Pioneer in Super Heavy Element Research Historical Remarks and New Experimental Developments

2020

With his theoretical work Walter Greiner pioneered super-heavy element research. He motivated the young scientists and actively shaped the profile of the Gesellschaft fur SchwerIonenforschung, GSI, Darmstadt. We are happy that still during his lifetime we at GSI could prove some of his predictions: Fusion with magic nuclei and super heavy elements, the nuclear species existing only by shell stabilization. With the discovery of oganesson, Z = 118, the heaviest element known today, we have come to the end of super heavy-element production by the fusion of magic nuclei. In-flight separation and new experimental developments including Walter Greiner’s new ideas for SHE synthesis will be discuss…

Age-related differences in a delayed pointing of a M�ller-Lyer illusion

2003

It has been suggested that movements to visible or remembered targets are differently sensitive to the Müller-Lyer (ML) illusion. Indeed, when the target is continuously visible, movements rely on the veridical object characteristics, whereas remembered movements are thought to reflect the perceived characteristics of the object. The aim of the present study was to determine how movements to visible or remembered targets are influenced by the ML illusion in children aged 7 to 11 years old. Participants were asked to make a perceptual judgment or to point a shaft extremity of the ML configurations (Closed, Control, and Open) in three visual conditions (Closed Loop, Open Loop-0-s delay, and 5…

Multisensory integration in hemianopia and unilateral spatial neglect: Evidence from the sound induced flash illusion.

2016

Recent neuropsychological evidence suggests that acquired brain lesions can, in some instances, abolish the ability to integrate inputs from different sensory modalities, disrupting multisensory perception. We explored the ability to perceive multisensory events, in particular the integrity of audio-visual processing in the temporal domain, in brain-damaged patients with visual field defects (VFD), or with unilateral spatial neglect (USN), by assessing their sensitivity to the 'Sound-Induced Flash Illusion' (SIFI). The study yielded two key findings. Firstly, the 'fission' illusion (namely, seeing multiple flashes when a single flash is paired with multiple sounds) is reduced in both left- …

Body schema plasticity after stroke: subjective and neurophysiological correlates of the rubber hand illusion

2017

[EN] Stroke can lead to motor impairments that can affect the body structure and restraint mobility. We hypothesize that brain lesions and their motor sequelae can distort the body schema, a sensorimotor map of body parts and elements in the peripersonal space through which human beings embody the reachable space and ready the body for forthcoming movements. Two main constructs have been identified in the embodiment mechanism: body-ownership, the sense that the body that one inhabits is his/her own, and agency, the sense that one can move and control his/her body. To test this, the present study simultaneously investigated different embodiment subcomponents (body-ownership, localization, an…