Sábado 17 Fevereiro 2018

Electroencephalogram

Method concept and applications

The electroencephalogram (EEG) is a measure that allows to view the general activity of the cerebral cortex. The method is non-invasive and not painful and uses about 32 electrodes placed on the head with conductive adhesive in standard positions and connected to amplifiers and systems of record.  The EEG records the brain waves and measure small voltage fluctuations between selected pairs of electrodes, examining the different brain regions. For this, it is necessary the contribution from the small voltages of thousands of neurons, activated together, to have a sufficiently strong signal and be detected on the surface of the skull.

The cables of the pairs of electrodes are connected to amplifiers, which in turn command a pen register that form a set of simultaneous irregular hairstroke. The EEG rhythms vary and relate to certain states of behavioral and pathologies. As a result, it can be used to measure the cognitive functions, diagnosis and assessment of the effectiveness of treatments. Our research group uses EEG to study cognitive function, behavior and dynamics of pain processing, verifying the specific brain circuits involved in chronic pain conditions such as neuropathic pain and central sensitization.

Figure 1: Electrode placements of 32 channels according to the international 10–20 system.

eletrodos de 32 canais

Source: Lin YP, Yang YH, Jung TP. Fusion of electroencephalographic dynamics and musical contents for estimating emotional responses in music listening. Front Neurosci, 1;8:94, 2014 May.

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