In 1846, Ernst Heinrich Weber described the linear relationship between stimulus intensity and the perceived stimulus change. Assuming that this linear relationship is independent of the stimulus intensity, Gustav Theodor Fechner characterized the sensation of a stimulus with the aid of a logarithmic relationship between intensity strength and absolute threshold. Thereby Fechner regarded as the founder of psychophysics, which includes the sensory modalities of the absolute threshold, sensory intensity, stimulus identification and attraction scaling.
New GetSecs subfunction [getSecsClock, wallClock, syncErrorSecs] = GetSecs(‘AllClocks’); returns not only regular GetSecs() timestamp as ‘getSecsClock’, but also a wall clock timestamp ‘wallClock’ in UTC world time. This ‘wallClock’ time can be OS synchronized to external time references, ., via NTP, to synchronize it with the clocks of other computers. Measures seconds since some reference point, 00:00:00 UTC on Linux and OSX with microsecond resolution, seconds since 00:00:00 UTC on MS-Windows with millisecond resolution. This may come in handy for interoperation with EGI Netstation EEG systems.
The concepts of accuracy and precision have also been studied in the context of databases, information systems and their sociotechnical context. The necessary extension of these two concepts on the basis of theory of science suggests that they (as well as data quality and information quality ) should be centered on accuracy defined as the closeness to the true value seen as the degree of agreement of readings or of calculated values of one same conceived entity, measured or calculated by different methods, in the context of maximum possible disagreement.