Investigamos, no Experimento, se o estímulo precedente, que captura a atenção quando existem demarcações, deixa de capturar a atenção na ausência de demarcações por ter seu processamento filtrado precocemente. Além disso, investigamos, nos experimentos 2, 3 e 4, se alterações no fundo da tela, que gerassem maior competição no processamento dos estímulos presentes na cena visual, poderiam levar à captura da atenção, mesmo sem a presença das demarcações classicamente utilizadas. Observamos que quando a intensidade dos estímulos competidores presentes na tela era alta, o estímulo precedente passou a capturar a atenção. Explicamos esse resultado com a hipótese de que as demarcações são importantes por adicionarem ruído ao processamento dos estímulos apresentados, influenciando a representação desses estímulos e, portanto, a possibilidade de um estímulo capturar a atenção. Por fim, no Experimento 5, investigamos se os resultados da tarefa de escolha de local seriam replicados em uma tarefa de discriminação de forma. / In Experiment 1 we investigated if a peripheral stimulus, which is able to capture attention when there are placeholders on the screen, is no longer able to capture attention in the absence of placeholders because is early filtered. In Experimento 2, 3 and 4 we investigated if changes on screen background, which would generate stronger processing competition between stimuli, could lead to attentional capture even in absence of placeholders. Accorging to our results the peripheral stimuli is able to capture attention when competing stimuli of high intensity are presented togueter on screen. Our explanation is that placeholders are important because they add noise to stimuli processing, affecting stimuli representation and, therefore, the probability that a stimulus will capture attention. Lastly, in Experimento 5 we investigated if similar results would be obtained in a form discrimination task.

In recent years cognitive methods for lie detection has appeared. This with an increased need for digital tools for aiding professionals in the pursuit of detecting deceit. This study attempts to build and test a software agent to see if it can detect lies using reaction time (RT). In extension to this the study also asked which strategy would be best to find an unknown item if the agent was able to detect lies. 21 participants (mean age 30) were gathered online by the means of a link to a webpage with the software agent and a card prediction game on it. The study can thereby be viewed as a correlation study in the category of human computer interaction. The procedure was that the software agent would try to predict a card shown to the participant by asking questions. But the participant would try to deceive the software agent and make it fail. The participant was also instructed to answer as quickly as possible. The participant would do this while mixing truths and lies. The result of the study was that the software agent was unable to learn to distinguish between truths and lies using RT. It could therefore not be established what could have been an appropriate strategy. But an interesting finding might have been made. As the results suggest that it might be better to ignore truth as a category and instead use the RT of the task itself as the comparison for if the participant was lying. / Denna studie testade att använda en mjukvare agent för att upptäcka lögner med hjälp av reaktionstid (RT). Studien försökte även svara på vilken strategi som skulle vara optimal för att hitta ett okänt objekt ifall mjukvare agenten lyckades förutse ifall en människa ljuger. Studien hade 21 deltagare (medelålder 30 år). Dessa deltagare blev samlade online och utförde experimentet från sina hemdatorer utan översikt. Experimentet var en korrelationstudie där mjukvare agenten försökte förutse ett kort från en standard kortlek som visats för deltagaren. Därefter så skulle deltagaren svara så snabbt som möjligt på datorns frågor genom att klicka på tangentbordet. Detta medan deltagaren blandade att svara sant eller falskt. Resultatet var att mjukvare agenten förblev oförmögen att kunna förutse ifall en människa ljög eller inte. Därav bekräftades ej studiens frågeställningar. Men ett intressant fynd kan ha upptäckts. Resultatet pekar på att det kan vara bättre att använda sig av RT för handlingen istället för RT för sanning för att upptäcka ifall någon ljuger.

This diploma thesis deals with driver’s reaction time in regular road traffic. The theoretical part of this work focuses on reaction time, such as various definitions, structuring of reaction time, methods of measuring or publications made by other authors. The practical part of this diploma thesis includes proposal and realization of experiment, based on analysis of the current state by the author of this diploma thesis, which focuses on driver’s reaction time in regular road traffic (various traffic situations). At the end, the practical part presents the results evaluation based on various traffic situations or headway.

This paper deals with the preparation, implementation, and basic assessment of the motorists’ response times to simple optical and complex – other than optical - stimuli. Driving tests conducted partly under regular traffic conditions and partly on a test track are completed with findings on how drivers react when they use their phones during driving. Knowledge of the actual technically achievable reaction time is necessary in performing analyses and consequent assessments of the causes and developments of road traffic accidents.

The aim of this work is to evaluate current procedures and to refine assessment of impact connected to the drivers' age and traffic accidents. The theoretical part describes senior drivers, traffic accident rate of seniors and decreased ability to drive influenced by age. The practical part is case report of traffic accidents caused by senior drivers, measuring reaction time and the evaluation of these measurements. I have developed some proposals for seniors to prevent the risk of the occurrence of traffic accidents.

abstract: The human brain controls a person's actions and reactions. In this study, the main objective is to quantify reaction time towards a change of visual event and figuring out the inherent relationship between response time and corresponding brain activities. Furthermore, which parts of the human brain are responsible for the reaction time is also of interest. As electroencephalogram (EEG) signals are proportional to the change of brain functionalities with time, EEG signals from different locations of the brain are used as indicators of brain activities. As the different channels are from different parts of our brain, identifying most relevant channels can provide the idea of responsible brain locations. In this study, response time is estimated using EEG signal features from time, frequency and time-frequency domain. Regression-based estimation using the full data-set results in RMSE (Root Mean Square Error) of 99.5 milliseconds and a correlation value of 0.57. However, the addition of non-EEG features with the existing features gives RMSE of 101.7 ms and a correlation value of 0.58. Using the same analysis with a custom data-set provides RMSE of 135.7 milliseconds and a correlation value of 0.69. Classification-based estimation provides 79% & 72% of accuracy for binary and 3-class classication respectively. Classification of extremes (high-low) results in 95% of accuracy. Combining recursive feature elimination, tree-based feature importance, and mutual feature information method, important channels, and features are isolated based on the best result. As human response time is not solely dependent on brain activities, it requires additional information about the subject to improve the reaction time estimation. / Dissertation/Thesis / Masters Thesis Electrical Engineering 2019

Title: Effect of Alkaline Water Consumption on Sports Performance Objectives: The aim of the work was to find out the differences in performance after three days of intake of alkaline water in comparison with intake of water with normal pH. Methods: The thesis is conceived as an experimental study. A total of 12 participants aged 19-28 participated in the study. Volunteers were students of the UK FTVS military field. The testing included repeated crate outputs (Step-test), reaction rate tests on visual and auditory stimuli. Before and after exercise, blood lactate value, specific urine weight, and body diagnostics were recorded using a bio-impedance device. The study lasted a total of 3 weeks. Testing was performed with weekly spacing in controlled drinking regime of common or alkaline drinking water, always 2 days before testing. The obtained data were then analyzed and processed. Results: The average power of the Step-test participants in the first part of the measurement for both tests after the use of plain water is 718,8 W, compared to the average power of the participants after the use of alkaline water, which is higher and reaches 848,8 W. The test was 15,7 % with placebo and -0,9 % with alkaline water. The average perception of fatigue after drinking alkaline water was lower than that of...

No description available.

No description available.

No description available.