Inserting the sensors into the cap
Since the saline sensors are a little larger than the gel sensors, you need to stretch the material of the cap around the sensors, this wont damage the cap but will stretch out the holes.
With the saline felt pad facing inwards, place it over the sensor hole into which you wish it to fit. Flipping the Cap inside out, stretch the hole over the sensor, letting the material pop into place into the plastic groove.
Most of the sensor should be on the outside, while the felt should protrude towards the inside, where it will be resting against the scalp when the cap is in place. Repeat this step for all sensors.
Adding the rubber skirts (optional)
If you are taking long recordings, we have supplied rubber skirts to reduce evaporation of saline solution over time. These skirts should be fitted on the underside of the cap – easiest option is to do this once all the sensors are already in place and wires tided up. Rotating the sensor in the cap could lead to the skirt falling off.
Placing the control box in position
The control box can be placed in one of two pockets located at the top or rear of the cap. The top position is recommended for those doing studies on people who need headrests on a chair (in wheelchairs, for example), or in studies where people are lying down (sleep studies).
In the rear head position, the EMOTIV logo should be right way up, with the switch and cable ports along the lower edge. In the top position, the switch and cable ports should be along the rear edge.
Plug the cables into the control box
Plug the white connector (attached to all your red cables) into the right hand side of the control box. The connector only fits in one way, so if it fits in, then you have successfully connected your control box!
Repeat the same process the left side (blue cables). Double check all your cables are in the right place – you are almost ready for recording!
Tidying Up your wires
If you need to tidy up your wires, use the black tagger pins and the needle provided to lock your cables down and prevent any unwanted movement. This is like “sewing” the tagger pins into the material. These pins are the same as used to put price tags on clothing, if you have access to a tag gun you can use this to tie the wires in place too. Provided in the kit is also two cable ties as pictured below for bunching all the wires before the connector.
Repeating the process as before, push the needle all the way through 2 layers of material.
Slowly pulling the needle back and out, the black “T” should begin to slide out of the needle, keep pulling the needle out until the cable is attached on both sides of the wires. If it does not work the first time, we have included plenty if spare tagger pins.
When you are ready to record, hydrate your sensors
Saline sensors should be hydrated when you are ready for recording. It is recommended your first hydration should be done directly from the underside of the cap, directly onto the felt pads. Alternatively, you can put all the felts into a glass and soak them in saline solution, squeeze them gently to remove excess fluid and then fit them into each sensor location.
If the sensors dry out or you have a particularly long recording, you can re-hydrate the sensors through the hole in the top of the sensor. When the CQ starts to drop from green to orange it is time to top up.
Note: that the Flex Saline system includes skirts which may be fitted to the inside of each sensor. These skirts reduce evaporative loss and reduces the tendency of the fluid to spread out if excess fluid is applied.