Active clinical trials for "Illusions"

The purpose of this study is to examine the influence of extremity manipulation on individual's center of pressure after they adapt to an ankle based illusion.

Parkinson's disease is characterized not only by motor symptoms but also by psycho-behavioral symptoms including Visual Hallucinations (VH) and illusions (I), that are generally associated with a severe functional impairment and a bad prognosis for patients. Visual Hallucinations are defined by a visual perception without any real objet to perceive, whereas illusions are defined by a wrong perceptions of an object that is really present. In most of studies investigating the pathophysiology of VH in PD, no difference is made between VH and I, however different mechanisms could lead to the emergence of these two phenomenon, with different prognosis. Investigator hypothesize that illusions could be related to a visual impairment, maybe at the retinal level, known to be impaired in PD, whereas Visual hallucinations would be due to a more widespread impairment affecting higher levels visuo-perceptive and cognitive functions.

The present study investigates by means of the rubber hand illusion body image stability and sense of body ownership in patients with CRPS of the upper limb compared to patients with unilateral pain of origin other than CRPS and age and sex-matched healthy subjects.

Cross-education describes the transfer of motor performance to the opposite limb following unilateral training and is primarily explained by adaptations within the brain. The mirror training hypothesis suggests that illusionary mirror visual feedback may augment the cross-education of strength to the untrained, contralateral limb. The purpose of this project is to examine how the use of illusionary mirror visual feedback shapes the neuromuscular adaptations that occur for both limbs during unilateral (single-limb) strength training. Our hypothesis is that mirror training will augment the level of cross-education for the untrained arm.

The rubber hand illusion (RHI) causes a change in body perception and awareness as a result of the integration of simultaneously perceived visual and tactile stimulation. In the rubber hand illusion (RHI), which was first described in 1998, a realistic hand model is perceived as a part of the body and body awareness is impaired. In the RHI, the participant's real hand is positioned behind a screen so that it is out of sight; The rubber model hand is placed in the field of vision and in the appropriate position with the real hand. Brush is applied simultaneously to the same parts of the real and rubber hands. He/she perceives the rubber hand as his own and the brush starts to feel as if it is being rubbed into his own hand. This method, which causes the illusion of body belonging, has been defined as the rubber hand illusion. During the rubber hand illusion, increased activity was observed in the ventral premotor cortex, infraparietal cortex and cerebellum in functional MRI. It is suggested that this phenomenon occurs with the integration of interrelated visual, tactile and proprioceptive senses reaching the premotor cortex. Quantitative sensory tests are standardized subjective clinical sensitivity tests that require the collaboration of the person to be examined. In the tests, calibrated stimuli are applied to capture perception and pain thresholds, thus providing information about sensory thresholds. The impairment of body perception caused by RHI contributes to the multi-faceted understanding of sensory perception, higher-level cognitive processes, brain mapping and functions. In the studies; It has been suggested that the conflict between visual and proprioceptive sensory information created during the rubber hand illusion is resolved by the attenuation of somatosensory input at the cortical level. As far as we know, tactile sensory threshold from quantitative sensory tests, two-point discrimination from cortical senses, pressure pain threshold measured by the algometer, and vibration threshold variation during and after rubber hand burning, which causes changes in body perception, have not been studied before. In this study, the relationship between the RHI phenomenon and sensory thresholds will be evaluated.