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Öğe Appropriate image selection with virtual reality in vestibular rehabilitation: Cross-sectional study(JMIR Publications Inc., 2023) Ersin, Kerem; Gürlek, Emre; Güler, Hakan; Kalaycık Ertugay, Çi?dem; Şerbetçio?lu, Mustafa BülentBackground: While vestibular rehabilitation with virtual reality (VR) is becoming more popular every day, the disadvantages of this method are not yet clear. Objective: The aim of this study is to examine the effect of the image to be used in vestibular rehabilitation with VR on the systems that provide body posture. Methods: The study was carried out with 36 participants (18 women and 18 men) aged 18 to 30 years. To assess balance control components separately, a sensory organization test was administered to the participants in the presence of stressful and relaxing environment images with VR technology. The State-Trait Anxiety Inventory survey was also used to measure the stress values in the created environments. Results: The State-Trait Anxiety Inventory survey revealed that while stressful videos significantly increased stress, relaxing videos reduced stress. Among measurements obtained in the presence of VR, significant decreases were observed mostly in the visual system data. A significant increase in vestibular system data (P=.01) was observed with a decrease in visual system data (P<.001) when the relaxing image was presented. Additionally, there was a significant difference in the somatosensory (P=.001), composite (P=.002), and visual system (P[removed]Öğe Comparison of dynamic-static balance parameters of elite ice hockey players and normal individuals(Karger, 2022) Kara, Eyyüp; Kara, Halide; Acar, Melda; Ersin, Kerem; Yasak, İlknurIntroduction: Our study aimed at stressing the significance of the vestibular system for ice hockey players, meanwhile focusing on the relation between the vestibular system and ice hockey for which balance is a significant factor. Our main aim was to compare the balance parameters of hockey players and normal individuals. Methods: Our experimental group consisted of 37 professional elite ice hockey players, and our control group consisted of 37 young males who have not previously been involved in sports as professionals. Participants had been subject to sensor organization test, adaptation test, weight-bearing/squat, unilateral stance, rhythmic weight-shifting tests of computerized dynamic posturography device. Results: Overall results indicate no significant difference between the control group and ice hockey players in the sensor organization test, which is caused by control group’s comprising adolescents with amateur sport involvement. In adaptation test and unilateral stance test, a significant difference was found between experimental and control groups. Discussion/Conclusions: This study determined the dynamic and static balance characteristics of ice hockey players. For this reason, it is useful to test the balance abilities of ice hockey players in static and dynamic conditions to evaluate their performance level. After testing individuals with vestibular problems with dynamic balance tests, appropriate sports exercises can be given to improve dynamic and static balance.Öğe Investigation of the effects of auditory and visual stimuli on attention(Elsevier Ltd, 2021) Ersin, Kerem; Gündoğdu, Oğulcan; Kaya, Sultan Nur; Aykırı, Dilşad; Şerbetçioğlu, Mustafa BülentAttentional resources limit our perceptual capacities. One vital point is whether these resources are allotted severally to every sense or shared between them. We addressed this problem via means of topics to carry out a dual-task, both in the same modality or other modalities (visual and auditory). The primary task is to count the number of passes of the participants while watching the video that requires visual and auditory attention. Concurrently, they were also asked to notice the pure tones and visual events in the song during the video while counting their pass numbers. The results show that while the auditory task reduced the detection ability visual events task, the dual-task had a significant effect. Previous studies support that tasks requiring simultaneous auditory and visual attention affect each other. Our results have clear implications for showing that performance decreases in dual-task as the perceptual load increases.Öğe Preliminary study: The test technique for the evaluation on spatial navigation in the absence of visual data in healthy individuals(Tehran University of Medical Sciences, 2024) Yılmaz, Oğuz; Kurtuluş, Ceren; Ersin, Kerem; Gündoğdu, Oğulcan; Eti, Serkan; Şerbetçioğlu, Mustafa BülentBackground and Aim: Path integration refers to the capability of utilizing self-motion information produced by one’s own bodily movements to accurately determine and maintain one’s position in space. Typically, path integration mechanisms come into play when visual information is limited or absent. The objective of this study was to develop a path integration test that relies solely on self-motion cues derived from body movements, without the involvement of visual cues. Methods: The study involved 157 volunteers (86 females and 71 males) aged between 18 and 70 years. Participants were asked to walk on a coordinated ground with their closed eyes and follow the six different commands. They were, after that, requested to return their initial position. Movement time was manually measured by the stopwatch. The distance between the original reference point and estimated starting point was recorded. Results: The second command that showed the lowest standard deviation out of the six commands given to the participants was observed as the more reliable test among the other commands (47.51±33.75). In addition, the completion time of the second command increased with increasing age (p[removed]Öğe Somatosensöriyel sistemin vestibüler sistem üzerine etkisi(İstanbul Medipol Üniversitesi Sağlık Bilimleri Enstitüsü, 2019) Ersin, Kerem; Şerbetçioğlu, Mustafa BülentBu çalışma somatosensöriyel sistemin vestibüler sistem üzerine etkisini incelemek amacıyla yapılmıştır. İstanbul Medipol Üniversitesi'nde okuyan, yaşları 18-25 arası değişen 27 kadın ve 27 erkek olmak üzere 54 birey üzerinde yapılmıştır. Bu kişilere Video Baş İttirme Testi (vHIT) ve Vestibüler Uyarılmış Kas Potansiyeli (VEMP) testi uygulanmıştır. Bu testler sırasıyla oturarak, ayakta ve sünger üzerinde ayakta yapılmıştır. Ayrıca bireylere çalışma esnasında kendilerini dengeli hissedip hissetmedikleri anket yoluyla sorulmuştur. Veriler SPSS 22.0 istatistik paket programı ile değerlendirilmiştir. Çalışmaya katılan bireylerin yaklaşık olarak yüzde 33'ü doldurdukları anket sonuçlarına göre süngerde kendilerini dengede hissetmediğini, yaklaşık yüzde 8'i de ayakta kendi dengeli hissetmediğini belirtmiştir. vHIT sonuçlarına göre oturarak-ayakta VOR kazançları arasında hem sağ hem de sol tarafta, ayakta- sünger üstünde ayakta vHIT karşılaştırması ise sağ posterior kanal VOR kazancında anlamlı bir farklılık gözlenmiştir (p<0.05). vHIT sonuçlarında lateral ve anterior kanal VOR kazançlarının karşılaştırmalarında anlamlı bir fark gözlenmemiştir. VEMP sonuçlarında ise sağ tarafta ayakta ve sünger üzerinde ayakta P1-N1 amplitüdü karşılaştırmasında istatistiksel olarak anlamlı bir fark gözlenmiştir (p<0.05). Bunun dışında kalan VEMP parametrelerinden latans, asimetri ve geri kalan amplitüd karşılaştırmalarında anlamlı bir fark bulunamamıştır. Ayağa kalkma ve sünger üzerinde ayakta durma sırasında değişen somatosensöriyel girdinin, inferior vestibüler sinir aracılığıyla posterior kanal VOR değişikliğine sebep olduğu düşünülmüştür. VEMP sonuçlarının yalnızca sağ tarafta anlamlı fark oluşturması ise, vestibüler-somatosensör multisensör duyuların baskın olduğu hemisfer tarafı (sağ) ile uyumlu çıkmıştır. Sonuç olarak bu iki sistemin birbirleriyle uyumlu çalışması ve birbirlerinin yerini doldurabilmesi; aynı zamanda bu özellikleri sayesinde mekânsal algı ve ağrı gibi genel duyular üzerinde ortak etkilenim yaratmaları, vestibüler rehabilitasyon konusunda somatosensöriyel sistemin önemini daha iyi vurgulamıştır.Öğe The effect of somatosensorial system on vestibular system(Springer, 2022) Ersin, Kerem; Şerbetçioğlu, Mustafa Bülent; Öztürk, Şeyma Tuğba; Yılmaz, OğuzThe aim of this study was to investigate the effects of the somatosensory system on the vestibular system and the interconnected ways they work together to maintain balance. The study was conducted on 54 individuals (27 females and 27 males), aged between 18–25 years. vHIT as well as cVEMP tests were used to evaluate the participants. Tests were carried out while sitting, standing on firm surface and standing on foam respectively. According to the posterior vHIT results, there was a significant difference between VOR gains obtained while sitting and standing on firm surface in right side as well as on the left side (p < 0,01). Moreover, when VOR gains in standing on firm and standing on foam results were compared to each other, statistical significance was found right and left posterior canals (p < 0,05). Concerning the results obtained from VEMP, a statistically significant difference was seen in the comparison of P1-N1 amplitudes of the right side on firm surface and standing on foam (p < 0,01). When the inputs from somatosensorial system are disturbed, the parts of the vestibular system that are primarily affected are the posterior SSC, saccule and inferior vestibular nerve. This can be interpreted as the inferior vestibular nerve being more affected than the superior vestibular nerve when posture is disturbed due to somatosensory cues being unavailable or unstable.Öğe The impact of optical illusions on the vestibular system(Korean Audiological Society, 2021) Öztürk, Şeyma Tuğba; Şerbetçioğlu, Mustafa Bülent; Ersin, Kerem; Yılmaz, OğuzBackground and Objectives: Balance control is maintained in stationary and dynamic conditions, with coordinated muscle responses generated by somatosensory, vestibular, and visual inputs. This study aimed to investigate how the vestibular system is affected in the presence of an optical illusion to better understand the interconnected pathways of the visual and vestibular systems. Subjects and Methods: The study involved 54 young adults (27 males and 27 females) aged 18-25 years. The recruited participants were subjected to the cervical vestibular evoked myogenic potentials (cVEMP) test and video head impulse test (vHIT). The cVEMP and vHIT tests were performed once each in the absence and presence of an optical illusion. In addition, after each test, whether the individuals felt balanced was determined using a questionnaire. Results: cVEMP results in the presence of the optical illusion showed shortened latencies and increased amplitudes for the left side in comparison to the results in the absence of the optical illusion (p <= 0.05). When vHIT results were compared, it was seen that the right lateral and bilateral anterior canal gains were increased, almost to 1.0 (p<0.05). Conclusions: It is thought that when the visual-vestibular inputs are incompatible with each other, the sensory reweighting mechanism is activated, and this mechanism strengthens the more reliable (vestibular) inputs, while suppressing the less reliable (visual) inputs. As long as the incompatible condition persists, the sensory reweighting mechanism will continue to operate, thanks to the feedback loop from the efferent vestibular system.
