Configuring your sensor placement

The EPOC Flex cap has 72 openings that you can fit sensors to your own montage. The wire lengths for channels A-H are 32cm and best for pre-frontal (Fp), frontal (F) and temporal (T) sensors because of the extra length. Channels J-Q are 16cm in length and recommended for placing at parietal (P) or occipital (O) positions. The cap openings are universal 10-20 system positions as shown below.

There are 32 sensorsthat you can fit into the cap (you can remove unused sensors if needed). Before attaching sensors to the EEG cap, it is best to position the channels (A-Q) that you intend to use for your specific experiment, this will be needed to be copied in EmotivPRO later. We recommend trying to keep the left and right as a mirror image because this makes fitting and checking easier.

When your sensors are positioned, use the configuration option in EmotivPRO software package to allocate the correct labels to each sensor. Your headset must be connected to access the configuration page. Configurations may be saved for future use. The configuration will be retained until a change is made.

I am using EPOC Flex

Flex Saline (felt) sensors

The sensors are labelled A-Q and the references (CMS and DRL) on the cable next to the sensor as shown in the image. The crimped end of the wire has already been fitted into the corresponding position of the connector.

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.

With the EMOTIV logo facing outwards, stretch the fabric into the groove around the circular part of the control box securing the box in place.

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.

Flex Gel Sensors

The A-Q labels are written next to the sensor itself, where the cable is attached

Note: The cables labeled A-H are 32 cm long. J-Q are 16 cm and designed to be placed closer to the control box (towards the back of the head). Keep this in mind when fitting the sensors to the cap.

Cables A-Q as well as the DRL reference (right) and CMS reference (left) are labelled on the cables themselves and will match the designated positions on the control box when you insert the connectors after fitting the sensors to the cap.

Inserting the sensors into the cap

Holding on the underside of the cap, stretch the material in all directions around the hole you intend to fit, then wedge the sensor into the hole, pushing upwards first and then letting the material go to fix the bottom half. Adjust the material until the sensor is fully fixed. Repeat this step for all sensors in your desired configuration.

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.

With the EMOTIV logo facing outwards, stretch the fabric into the groove around the circular part of the control box securing the box in place.

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 – Get your gel sensors ready

For the participant, fit the cap and then:

  1. Place the Cap on the participant’s head, aligning Cz according to the 10-20 System (halfway between the Nasion and Inion)
  2. With a cotton wool bud, clean the skin below the sensor opening with a degreasing agent such as alcohol (dip the cotton end of a wooden swab in alcohol and degrease the skin by rotating on the spot).
  3. With the cotton swab, dipped in abrasive gel, abrade the skin by rotating the swab in the hole of the ring-shaped electrodes.
  4. Using a syringe, apply a generous amount of electrolyte gel through the hole, onto the scalp that you just prepared.
  5. Repeat for all sensors, check your signal quality in EmotivPRO after each sensor to check that contact quality shows green.

Note: As most electrolyte gels permeate the skin, it is best to fill all electrodes before checking signal quality. Most problems result from insufficient contact between skin and gel or gel and sensor. Note: Signal quality will not be visible until both CMS and DRL reference sensors are fitted and at least one other sensor. You may need to improve both the references and the first sensor until at least one GREEN indicator is shown. Subsequently, you should only need to improve the sensor that you are working.

For more help regarding the usage of EMOTIV Epoc Flex, please consult the manual or contact customer support.

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