Carlos Alberto Stefano Filho edited section_Introduction_One_of_the__.tex  over 8 years ago

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Nonetheless in EEG, due to the large size of the electrodes and the distorting and attenuating effects of the soft and hard tissues between the source and the measurement, the signal is spatiotemporally smoothed, and it is considered to be the result of integrating over an area of 10 cm² of sources \cite{22595786} Also, since EEG records from the scalp of a subject, it is better for detecting surfacing potentials, predominantly the ones generated in the cortex layer of the brain, where the synchronization and regular spatial arrangement of the tissue makes it possible for the superposition of many small sources into a measurable macroscopic signal. Therefore, potentials from inner regions in the brain are negligible in a typical EEG signal recording. [Niedermeyer and da Silva, 2005].  EEG apparatus are quite common due to their portability, low cost and high temporal resolution. EEG has been widely used in various clinical and research environments.]. environments.  Moreover, as a noninvasive and secure technique, EEG has been extensively used in various clinical and research environments. In the clinical sense it is the most used technique for studying sleeping disorders [Campbell, 2009]. There are plenty of other relevant applications, such as locating areas of brain damage, monitoring cognitive functions, testing drug's effects and searching for epilepsy seizure origin and signal acquisition for brain-computer interfaces (BCIs) [Teplan, 2002; Bickford, 1987].