Use Of Computer Interface Research Articles

EEG sensor system development consisting of solid polyvinyl alcohol–glycerol–NaCl contact gel and 3D-printed, silver-coated polylactic acid electrode for potential brain–computer interface use

The paper describes the development of a reusable electrode system for non-invasive brain–computer interface application with signal quality comparable to that of conventional wet Ag/AgCl electrodes. The innovative electrode system consists of a polyvinyl alcohol–glycerol–NaCl contact hydrogel and a 3D-printed, silver-coated polylactic acid electrode body. Advantageous features of the proposed system are the comfortable use, reusability, long shelf life, and alterable geometry. The electrical properties of freshly prepared and aged contact gels, as well as different gel/silver interfaces, were separately characterized, showing much lower impedance values than those measured at the electrode–skin interface with the complete electrode system. Acceptability limits relevant to electroencephalographic measurements, such as signal-to-noise ratio during steady-state visually evoked potential measurements and band ratio values during alpha wave detection, have proven the applicability of the system.

Brain-computer interface use is a skill that user and system acquire together.

A brain–computer interface (BCI) is a computer-based system that acquires, analyzes, and translates brain signals into output commands in real time. Perdikis and colleagues demonstrate superior performance in a Cybathlon BCI race using a system based on “three pillars”: machine learning, user training, and application. These results highlight the fact that BCI use is a learned skill and not simply a matter of “mind reading.”

СЕРЕДОВИЩЕ НАВЧАЛЬНО-ДОСЛІДНИЦЬКОЇ ДІЯЛЬНОСТІ УЧНІВ НА ОСНОВІ ПОЄДНАННЯ ОНТОЛОГІЧНОГО ІНТЕРФЕЙСУ І ГІС-ТЕХНОЛОГІЙ

У статті розглядаються питання застосування комп’ютерних онтологій і онтологічного інтерфейсу як ефективного засобу інтеграції, агрегації та візуалізації розподілених інформаційних ресурсів і систем на основі використання семантичних властивостей з метою створення і використання інформаційних середовищ у навчально-дослідницькій діяльності учнів. Описується підхід поєднання можливостей комп’ютерних онтологій і функцій геопросторового аналітичного інструментарію ГІС. Наводиться методика застосування онтологічного інтерфейсу на прикладі створення тематичних шарів карт у ГІС-середовищі на основі тематичної онтології.

Teaching RC and RL Circuits Using Computer–supported Experiments

We suggest the study of the charging and discharging processes in the capacitor in an RC circuit and the rise and decay of current processes in an RL circuit using computer–interfaced experiments. This approach enables students to understand functions of RC and RL circuits through the visualisation of the processes, understand the use of computer interface for data collection, and speed up the data collection and their analyses. Using Excel for data analysis enables the verification of Kirchhoff's loop rule for the RC and RL circuits for each instant of time and the determination of time constants for the circuits through the graphical analyses.

Motivation modulates the P300 amplitude during brain–computer interface use

This study examined the effect of motivation as a possible psychological influencing variable on P300 amplitude and performance in a brain-computer interface (BCI) controlled by event-related potentials (ERP). Participants were instructed to copy spell a sentence by attending to cells of a randomly flashing 7*7 matrix. Motivation was manipulated by monetary reward. In two experimental groups participants received 25 (N=11) or 50 (N=11) Euro cent for each correctly selected character; the control group (N=11) was not rewarded. BCI performance was defined as the overall percentage of correctly selected characters (correct response rate=CRR). Participants performed at an average of 99%. At electrode location Cz the P300 amplitude was positively correlated to self-rated motivation. The P300 amplitude of the most motivated participants was significantly higher than that of the least motivated participants. Highly motivated participants were able to communicate correctly faster with the ERP-BCI than less motivated participants. Motivation modulates the P300 amplitude in an ERP-BCI. Motivation may contribute to variance in BCI performance and should be monitored in BCI settings.

The use of computer interface in the rapid diagnostic breast clinic

The use of computer interface in the rapid diagnostic breast clinic

Children’s interactions and learning outcomes with interactive talking books

How do pairs of children interact when using a multimedia CD-ROM storybook (“talking books”), and do their patterns of interaction reflect the gender composition of the pair? Do different types of pairs interact differently and remember the activity differently? These questions were addressed with a classroom experiment in which 8 year old boy/boy, boy/girl and girl/girl pairs worked through the screenpages of a CD-ROM storybook prior to completing a cued-recall comprehension test and a free-recall story writing exercise. During the storybook activity measures of computer interface use and measures of verbal interaction were recorded. Differences between pairs of children were recorded in the use of the computer interface, and verbal interactions were related to interface activity. The comprehension test delivered no differences between pairs, but the free-recall story writing exercise found superior performance for girls who had previously worked together. The measures of verbal interaction taken during the storybook activity did not predict subsequent performance, although disputes over the control of the mouse were related to free-recall story writing.