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Perception of subjective visual vertical
Radvanská, Edita ; Čakrt, Ondřej (advisor) ; Kučerová, Klára (referee)
Postural balance system is a multisensory-organized complex using afference of exteroceptors, enteroceptors, proprioceptors and the visual and the vestibular system. The utriculus and the sacculus are otolith organs placed in the vestibular labyrinth and they are capable of recognizing the direction of gravity. Their function is crucial for keeping postural stability during stand and walk. The ability to recognize the geophysical vertical is failing if the vestibular system is impaired. There are the subjective visual vertical (SVV), the subjective postural vertical (SPV) and the subjective haptic vertical (SHV) which can be tested in humans. This study is interested in SVV, its pathophysiology and measuring. We are comparing the accuracy of measurement of SVV by the Bucket method and a mobile application Visual Vertical in healthy subjects in our experiment.
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Changes in perception of subjective vertical in cerebrovascular accident patients
Kříž, Petr ; Čakrt, Ondřej (advisor) ; Bitnar, Petr (referee)
Cerebro-vascular accident often affects parts of brain responsible for spatial orientation. Optimal integration of afference from visual, somatosensory and vestibular system is necessary for maintaining balance and often in the end for the functional indepencence of the patient. Examination of subjective vertical is a sensitive signifier for spatial orientation and the ability to discern graviception. By using clinical examination of subjective visual vertical it is possible to objectify and quantify graviception disorder excluding visual context. Current level of understanding in this field is briefly summarized in theoretical part of this study. In practical part subjective visual vertical examination by bucket-method was for statistically comparison of 29 patients after a cerebro- vascular accident with 34 healthy seniors. Hypotheses about the influence of a side of a lesion and a time elapsed since the lesions were also tested. The study concludes that the perception of verticality in patients after cerebro- vascular accident can be severely affected. Additionally, the study highlights the reliability of examination of patients after cerebro-vascular accident using clinically practical bucket-method.
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Perception of subjective visual vertical
Radvanská, Edita ; Čakrt, Ondřej (advisor) ; Kučerová, Klára (referee)
Postural balance system is a multisensory-organized complex using afference of exteroceptors, enteroceptors, proprioceptors and the visual and the vestibular system. The utriculus and the sacculus are otolith organs placed in the vestibular labyrinth and they are capable of recognizing the direction of gravity. Their function is crucial for keeping postural stability during stand and walk. The ability to recognize the geophysical vertical is failing if the vestibular system is impaired. There are the subjective visual vertical (SVV), the subjective postural vertical (SPV) and the subjective haptic vertical (SHV) which can be tested in humans. This study is interested in SVV, its pathophysiology and measuring. We are comparing the accuracy of measurement of SVV by the Bucket method and a mobile application Visual Vertical in healthy subjects in our experiment.
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The inpluence of age on the perception of verticality in healthy individuals
Kmeť, Jan ; Čakrt, Ondřej (advisor) ; Slabý, Kryštof (referee)
INTRODUCTION - The ability to maintain stability while standing given by function of multisenzory system consists of vision, somatosensory and vestibular system and integration of the CNS. Due to aging there is a decrease of functional capacity of the organism, including these systems, resulting in a deterioration of the balance. Examination of subjective visual and haptic vertical is sensitive diagnostic criterion for functionality of these systems. OBJECTIVE - To compare the ability of verticality perception in young and elderly. METHODS - We examined 64 probands in visual and haptic subjective vertical. The first group consisted of 30 subjects aged 20 to 30 years. In the second group there were 34 people aged over 60. RESULTS - The values of the subjective visual vertical not differ between groups (0.1 ± 0.75 ř for the young and 0.1 ± 1.91 ř for seniors). Results of subjective haptic vertical differed on the significance level of p = 0.004 (0.8 ± 3.67 in the young and 3.7 ± 4.15 for seniors). CONCLUSION - Because subjective haptic vertical is diagnostic criterion mainly for the somatosensory system, we can assume that this particular system is responsible for a decrease in functional capacity and deterioration of stability in the elderly.
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Changes in perception of subjective vertical in cerebrovascular accident patients
Kříž, Petr ; Čakrt, Ondřej (advisor) ; Bitnar, Petr (referee)
Cerebro-vascular accident often affects parts of brain responsible for spatial orientation. Optimal integration of afference from visual, somatosensory and vestibular system is necessary for maintaining balance and often in the end for the functional indepencence of the patient. Examination of subjective vertical is a sensitive signifier for spatial orientation and the ability to discern graviception. By using clinical examination of subjective visual vertical it is possible to objectify and quantify graviception disorder excluding visual context. Current level of understanding in this field is briefly summarized in theoretical part of this study. In practical part subjective visual vertical examination by bucket-method was for statistically comparison of 29 patients after a cerebro- vascular accident with 34 healthy seniors. Hypotheses about the influence of a side of a lesion and a time elapsed since the lesions were also tested. The study concludes that the perception of verticality in patients after cerebro- vascular accident can be severely affected. Additionally, the study highlights the reliability of examination of patients after cerebro-vascular accident using clinically practical bucket-method.
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Compensation of the subjective visual vertical in patients after surgery of the vestibular schwannoma
Kmeť, Jan ; Čakrt, Ondřej (advisor) ; Pospíšilová, Mariana (referee)
In patients with the vestibular schwannoma balance disorders are common symptom. Problems can appear before a surgery, because of an oppression of the nerve the afferents from vestibular system of affected side is aborted. But it is often that patients have no problems with balance until the operation. After the operation they have a balance disorder, a vertigo and a change in the perception of the vertical. Thanks to the rest of the afferent systems and the otherside vestibular system it comes to a slowly compensation and to a new setting of the verticality in the central nervous system. This bachelor thesis studies our sense of the verticality and a function of each receptor, which participate in modelation of this sense. In practical part we handle the subjective visual vertical, which is a result of the vestibular function. We also observe progress and velocity of SVV compensation in patients after a removal of the vestibular schwannoma and we compare it with the state before the operation.
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