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In-Depth Information
Fig. 9.2
Experimentation
rooms.
a
Control room.
b
Room of the participant.
1
Recording computer.
2
Computer devoted to the
relaxation process.
3
Control
computer linked to the control
camera.
4
Participant.
5
Control camera
9.2.2 Procedure
The experiment was conducted individually in a soundproof room, where the
participant was comfortably seated in front of the computer screen (see Figs.
9.2
and
9.4
).
It takes approximately 2 h and a half to place the EEG cap, to perform the
experiment and to have a
final explanatory interview with the participant. This
interview occurred at the end of the whole data acquisition procedure to not affect
EEG records. Data collection was controlled by the acquisition system Coherence
3NT (Deltamed,
http://www.natus.com/
)
. The data acquisition procedure is com-
posed of
five steps which are represented in Fig.
9.3
:
1. First EEG: the participant has to look at a cross (
(fixation point) at the center of
the screen to reduce eye movements. This
first recording corresponds to the
reference state, considered as the normal vigilance state of the participant. A
photograph of a member of our team, took to represent the conditions of an EEG
recording, is given in Fig.
9.4
.
Fig. 9.3
Diagram of the data acquisition procedure
