The Set up tab is displayed by default when starting the Emotiv Xavier SDK. The main function of this panel is to display contact quality feedback for the neuroheadset's EEG sensors and provide guidance to the user in fitting the neuroheadset correctly. It is extremely important for the user to achieve the best possible contact quality before proceeding to the other Emotiv Xavier tabs. Poor contact quality will result in poor Emotiv detection results.
The image on the left is a representation of the sensor locations when looking down from above onto the user's head. Each circle represents on sensor and its approximate location when wearing the Insight SDK headset. The color of the sensor circle is a representation of the contact quality. To achieve the best possible contact quality, all of the sensors should show as green.
Other sensor colors indicate:
Black No signal
Red Bad signal
Orange Poor signal
Green Good signal
The setup procedure used to achieve good contact quality is outlined below. Only after the neuroheadset sensor contact quality has been verified, should you move on to other Emotiv Xavier tabs.
Achieving Good Signal Quality
**Note to SDK Developers: This section is not required, but may be useful to understand how contact quality information may need to be conveyed to the user for standalone, Emotiv-enabled applications.
Step 1: Switch on the neuroheadset and verify that the built in battery is charged and is providing power by looking for the blue LED located near the power switch at the back of the headset. If the headset battery needs charging, then set the power switch to the off position, and plug the headset into the Emotiv battery charger using the mini-USB cable provided with the neuroheadset. Allow the neuroheadset battery to charge for at least 15 minutes before trying again. **Do not charge the headset while wearing it.
Step 2: Verify that the Wireless Signal reception is "good" by looking at the EPOC Status area in the EPOC Status Pane. If the Wireless Signal status is "Bad" or "No Signal" then make sure that the Emotiv Wireless USB Receiver is inserted into a USB port on your computer and that the single LED on the top half of the receiver is on continuously or flickering very rapidly. If the LED is blinking slowly or is not illuminated, then remove the receiver from the computer, reinsert it, and try again. Remove any metallic or dense physical obstructions located near the receiver or the neuroheadset, and move away from any powerful sources of electromagnetic interference such as a microwave oven, large motor, or high powered radio transmitters.
Step 3: Put on the neuroheadset by gently pulling apart the headband and lowering the sensor arms onto your head from the top down, near the rear of the skull. Next, slide the headset forward, until the sensors closest to the headset pivot points are located directly above your ears and as close to the hairline as possible. Adjust the fit so that the rectangular compartments at the front ends of the headband sit comfortably just above and behind your ears. Tilt the headset so that the two lowest, frontmost sensors are symmetric on your forehead and positioned 2 to 2.5 inches above your eyebrows. Finally, check that all sensors are touching your head, and if not, then fine tune the headset fit by gently sliding the headset in small increments until an ideal fit has been achieved.
Step 4: Repeat for each of the remaining sensors until all of the sensors have adequate contact quality (i.e. are predominantly showing green).
If at any time, the reference sensors (located just above and behind your ears) no longer have a good connection (i.e. not showing green), immediately restore these sensors to green before proceeding further.