D2.1 Requirements and Specification - CORBYS
D2.1 Requirements and Specification - CORBYS
D2.1 Requirements and Specification - CORBYS
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<strong>D2.1</strong> <strong>Requirements</strong> <strong>and</strong> <strong>Specification</strong><br />
Figure 40: EEG Dry Devices<br />
On the other h<strong>and</strong>, clinical acquisition systems for dry devices are not available on the market, instead, several<br />
commercial offerings have been made that could fulfil BCI requirements. An important key feature is that<br />
these systems are focussed on every day use of EEG equipment over a long-term period. For that reason,<br />
particular attention is paid to the headset design which has to be lightweight, comfortable <strong>and</strong> at the same time<br />
ensures coverage in the area of interest. One of the main key points of these systems is that they are portable<br />
since they incorporate wireless connection link with a computer. For instance, the Enobio system (Figure<br />
40(b)) developed by Starlab, is a device with 4 dry active digital electrodes placed on the forehead, it shows<br />
similar responses compared to Active Two system from Biosemi (gel based device) (Cester et al, 2008; Riera<br />
et al, 2008;, Starlab, n.d). A Neural Impulse Actuator (NIA) (Figure 40(e)) is also available, a OCZ<br />
Technology product, it uses three carbon-fibre sensors placed in the forehead (OCZ Technology, n.d); instead,<br />
NeuroSky provides with MindSet (Figure 40(d)) a sensor system with just one single dry sensor at EEG<br />
position FP1 (International 10-20 system) (NeuroSky, n.d). These are wearable wireless devices, however all<br />
of them have constrained in EEG research possibilities since the sensor location do not cover the areas of<br />
interest in the BCI community (like the sensory-motor cortex) <strong>and</strong> they sense the active in the prefrontal areas<br />
focalising in mental activity such as attention <strong>and</strong> meditation. So far, Epoch (Figure 40(a)), commercialised<br />
by Emotiv, is the most complete in fulfilling BCI requirements: it collects data from 14 saline sensors (they<br />
eliminate the electrolytic gel of wet electrodes but a saline solution has to be used) placed in a wearable<br />
wireless neuroheadset, located at AF3, AF4, F3, F4, F7, F8 FC5, FC6, T7, T8, P7, P8, O1 <strong>and</strong> O2. P300<br />
experiments were already conducted (Campbell et al, 2010). Unfortunately the Epoch neuroheadset does not<br />
support experiments involving motor cortex (brain area widely used in BCI) (Emotiv, n.d).<br />
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