Auditory Evoked Potentials
Tactile Evoked Potentials
Auditory Evoked Potentials
Tactile Evoked Potentials
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mindBEAGLE automatically creates event-related potentials (ERPs) from the EEG data from each run (top right corner). The user can select the channel shown in this window by clicking on the corresponding position on the brain on the left side. The green line represents the averaged ERPs elicited by target stimuli, while the blue line shows the ERPs resulting from nontarget stimuli. The shaded green areas in the averaged plot mark the periods with a significant difference between the two lines.
The colored brain map in the left (Auditory P300 experiment) also shows the distribution of peak amplitude of the target stimuli, with green as the highest value and blue as the lowest value. The control accuracy could be seen in the bottom right plot. The plot evaluates how many stimuli need to be taken into account to reach a certain level of control accuracy. In these example, the control accuracy reached 100 after about 4 stimuli (auditory) and 100 after about 11 stimuli (vibrotactile).
Figure 3 presens different analyses from the motor imagery sessions. The four rectangular plots (called ERDS plots) in the top left show the activation and deactivation of motor neurons during motor imagery. The activation is shown for two different positions, one on the left (C3) and one on the right side (C4) of the brain. Two plots are shown for each electrode site. The two upper plots represent the imagination of right hand motor movements, and the two lower plots show left hand motor imagination. The x-axis represents the time during imagination, the y-axis show different frequency bands from 8Hz to 30Hz. A blue color indicates deactivation of motor neurons, and red color reflects activation.
The two colored brains to the right of the result plots show the spatial distribution of neural activations.
The accuracy plot on the bottom displays the control accuracy, averaged over all motor imaginations, within one session. The blue line represents the averaged control accuracy from all of the patients’ runs with right hand movement imagination, and the yellow like reflects left hand imagination. The green line presents the average accuracy from both hands.
The mission is to test objectively if the patient can understand conversations and to provide a system for communication with DOC and LIS patients.