Wyniki wyszukiwania - BazTech

1

Poszukiwanie obiektywnych ilościowych parametrów opisujących wpływ pola elektromagnetycznego na organizm człowieka

Kanclerz Gabriela, Popielak Jakub, Sołdaj Urszula, Lefek Sylwia, Kacprzyk Artur, Rok Tomasz, Pawlak Rafał, Tatoń Grzegorz

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

|

2022

|

nr 4

628--630

PL

Pola elektromagnetyczne obecne w otaczającym nas środowisku, prawdopodobnie nie pozostają obojętne dla naszego zdrowia. Ilościowy pomiar wpływu pola elektromagnetycznego na podstawie zmian w funkcjonowaniu czy morfologii ciała człowieka nie był do tej pory możliwy ze względu na brak miarodajnych metod. Potencjalnym narzędziem mogącym służyć do pomiaru efektów promieniowania elektromagnetycznego może być sakadometr.

EN

Electromagnetic fields, although present in our environment, are possibly not indifferent to our health. Quantitative measurement of the effect of electromagnetic radiation on the basis of changes in the functioning or morphology of the human body has not been possible so far due to the lack of reliable methods. A potential tool that can be used to measure the effects of electromagnetic radiation may be the saccadometer.

2

Electrovestibulography (EVestG) application for measuring vestibular response to horizontal pursuit and saccadic eye movements

Ashiri Mehrangiz, Lithgow Brian, Suleiman Abdelbaset, Mansouri Behzad, Moussavi Zahra

Biocybernetics and Biomedical Engineering

|

2021

|

Vol. 41, no. 2

527--539

EN

Vestibular effects linked to eye movements have been extensively investigated, however, the effect of eye movements on the vestibular is relatively unknown. In this study, vestibular responses to horizontal pursuit and saccadic eye movements were examined in healthy individuals. Visual stimuli were presented to nineteen participants (27.7 ± 5.74 (SD) years, 11 female) using a virtual reality headset whilst the vestibular responses were simultaneously recorded using Electrovestibulography (EVestG). The average field potentials (FP) of three segments 1) prior to (Pre-Background), 2) during (Movement), and 3) after ceasing the visual stimulus (Post-Background) were extracted and the action potential (AP) area used as one feature. Both pursuit and saccadic eye movements resulted in a smaller average AP area during the Movement compared to Pre-Background (P = 0.002). Pursuit and saccadic eye movements also resulted in significantly longer time intervals between the low frequency (approximately 10 Hz) modulations of FPs detected during Movement compared to the Pre-Background (P≤ 0.001). Moreover, a comparison between rightward and leftward saccades indicated no significant difference between the two directions for the FP and time interval features (P > 0.37). These findings suggest that pursuit and saccade eye movements inhibit the activity of both the central (postulated efferent pathways) and peripheral (afferent) vestibular system. We hypothesize that the purpose of this vestibular inhibition is to limit the vestibulo-ocular reflex and optokinetic response. Additionally, the insensitivity of the vestibular system to the saccade directions with a stationary head provides anecdotal evidence on the bilateral efferent projections to the vestibular afferent and hair cells.

3

Saccadometry and LATER model shed light on brain plasticity in aging

Coubard O. A.

Biocybernetics and Biomedical Engineering

|

2013

|

Vol. 33, no. 2

125--127

EN

As frequency of falls increases in older adults, understanding how motor training programs counteract motor decline is a challenging issue. This study examined ocular saccades to test the effects of fall prevention (FP) on central motor control of older fallers. Saccades were recorded using a saccadometer in twelve participants aged 64–91 years before and after 2.5-month training in FP. We performed LATER analysis enabling us to examine the changes in motor control. FP decreased saccade latency and increased left-right symmetry of motor responses. LATER analysis showed that FP modulated decisional thresholds extending our knowledge of FP influence on motor control.

4

Saccadometry and movement inhibition

Poitou T., Pouget P.

Biocybernetics and Biomedical Engineering

|

2012

|

Vol. 32, no. 2

33-47

EN

To reveal some functional constraints of the saccade inhibitory neuronal circuits, we investigated the influence of response monitoring in human. The subjects were instructed to perform a stop signal task in which the probability of stop trial occurrence was manipulated. The purpose of the work was to evaluate the time course necessary to adapt the behavior to changes in the occurrence of stop signal. Our results show that humans are capable to spatially monitor the relative probability event of stopping and to finely and quickly modulate their ability to inhibit a response. These results have important consequence to apprehend pathologies in which, an inaccurate control of inhibitory process results in a loss of fundamental capability of behavioral adaptation.

5

Bayesian model for multimodal sensory information fusion in humanoid

Wong W. K., Loo L. C., Neoh T. M., Liew Y. W., Lee E. K.

Journal of Automation Mobile Robotics and Intelligent Systems

|

2011

|

Vol. 5, No. 1

16-22

EN

In this paper, the Bayesian model for bimodal sensory information fusion is presented. It is a simple and biological plausible model used to model the sensory fusion in human’s brain. It is adopted into humanoid robot to fuse the spatial information gained from analyzing auditory and visual input, aiming to increase the accuracy of object localization. Bayesian fusion model requires prior knowledge on weights for sensory systems. These weights can be determined based on standard deviation (SD) of unimodal localization error obtained in experiments. The performance of auditory and visual localization was tested under two conditions: fixation and saccade. The experiment result shows that Bayesian model did improve the accuracy of object localization. However, the fused position of the object is not accurate when both of the sensory systems were bias towards the same direction.

6

Direction-dependent saccadic waveform asymmetry

Walecki P., Lasoń W., Gorzelańczyk E. J.

Bio-Algorithms and Med-Systems

|

2008

|

Vol. 4, no. 8

73--79

EN

This paper presents response direction-dependent saccadic velocity waveform asymmetry and direction-dependent difference between means of saccadic parameters of eyeball movement such as duration, latency, amplitude, peak velocity. The research was a preparatory study which aimed to determine repetitive patterns in saccadic velocity waveform (SW). The study also aimed to distinguish different types of SW and eyeball movement direction-dependent waveform asymmetry (SWA).

PL

W artykule przedstawiono zależną od kierunku ruchu oczu asymetrię w profilu prędkości sakad i zależną od kierunku ruchu oczu różnicę pomiędzy średnimi wybranych parametrów skokowych ruchów gałek ocznych tj.: czasem trwania, latencją , amplitudą , prędkością szczytową . Badanie ma charakter wstępnego studium, którego celem jest opisanie powtarzających się wzorców profilu prędkości sakad. Celem badania jest również wyodrębnienie różnych przebiegów profili prędkości sakad oraz ich asymetrii, która związana jest z kierunkiem ruchu oczu.