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The goal of this work is to present new progress in the Brazilian Cesium fountain Br-CsF, which is currently back to operation after improvements in its optical system. The first result of this new stage is the Ramsey fringe showed in Figure 5. The central oscillation has a FWHM of 1.5 Hz with cycle time of 2 s and with signal noise ratio of 200. This fringe was obtained loading ∼109 atoms into a...
This paper presents a comparison between two different technologies of acquisition systems (BrainNet36 and Emotiv Epoc) for an Independent-BCI based on Steady-State Visual Evoked Potential (SSVEP). Two stimuli separated by a viewing angle < 1° were used. Multivariate Synchronization Index (MSI) technique was used as feature extractor and five subjects participated in the experiments. The class...
This work presents a robotic wheelchair that can be commanded by a Brain Computer Interface (BCI) through Steady-State Visual Evoked Potential (SSVEP), Motor Imagery and Word Generation. When using SSVEP, a statistical test is used to extract the evoked response and a decision tree is used to discriminate the stimulus frequency, allowing volunteers to online operate the BCI, with hit rates varying...
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