Collecting Data with Biosemi Active Two After the informed consent has been signed, the white noise has been started and the lights have been adjusted

1. Start the data acquiring program on the control room testing computer

2. In the control room, start the LabView program (Biosemi) that collects the data.

Switch to the Electrode Offsets page

3. TELL the subject what is about to happen at each step. Then follow the steps below to prepare the participant.

Place the cap on their head and get them to help by holding it in place on their forehead and getting it to fit well.

Leave the participant's ears underneath the cap.  You will not get a read from the two electrodes over the ears.

 Fill all the electrode wells with gel and insert the correct electrode into each well. BE GENTLE WITH THE ELECTRODES and WIRES.

Turn the video switch in the lab to EEG to see the data from these electrodes - you should be seeing a series of bar graphs for each electrode.

If all electrodes are too high, wiggle the DRL and CMR electrodes. If this doesn't reduce the noise, remove those two electrodes and refill them with gel, then replace them.

If one electrode is too high, wiggle it to reduce the noise level. Refill and replace if necessary.

When all of the electrodes are below 50, change the Labview program to Monopolar Display and Triggers. Now the subject can see their brain activity.

Have them blink and explain what's happening. Have them grit their teeth and also tell them about these artifacts.

Switch the video back to the participant's computer (CONTROL).

GIVE THE SUBJECTS THE INSTRUCTIONS FOR THE STUDY

6. In the control room, begin storing data.

Specify the file name and start storing

7. In the subject room, continue the program the subject will be using.

8. Close the door, go to the LabView computer and notify the participant that the study is beginning.