CGX Dev Kit User manual

Dev Kit
This manual contains general operating instructions, precautionary measures,
maintenance instructions, and information for use of the CGX Dev Kit.
Please read this manual carefully and familiarize yourself with the controls and
accessories before using the product.
Note
• This is an investigational device designed for research and development eorts.
• It is not an FDA-approved medical device.
• There are no known side eects from the use of this product.
CGX A Cognionics Company
The Dev Kit is a portable development-
oriented, dry EEG system. The kit
includes an 8-channel amplifier and
individual leads terminating in snap
connectors. Also included are Drypad,
Flex, and HydroFlex sensors, and
a fabric headband for aid in sensor
placement.
Wireless technology allows the subject
to move about while real-time data is
collected and displayed.
EEG channels are sampled at a time
resolution of 500Hz and converted to
digital data at 24 bits of resolution.
The Dev Kit provides research-grade
signal quality and is ideally suited
for general-purpose EEG and ERP
research in laboratory and field
environments.
Description

2
Warnings
TheDevKitisintendedtobeusedto
acquiretheelectroenchephalogram
(EEG)andtransmititwirelesslytoa
computer.
ThisDeviceIsIntendedForResearchOnly.
ItIsNotIntendedForTheFollowingUses:
• monitoring of patients in a clinical
environment
• use in medical diagnosis
• on subjects undergoing surgery
• use in sterile environments
• use with sleeping subjects
DoNotUseThisProductInThese
Situations:
• near high-frequency surgical equipment
• if exposed to ionizing radiation
• in oxygen-rich environments (concentration
> 25% at 1 atm)
• in wet environments
• in the presence of ammable anesthetics
or gases
PrecautionsForThePractitioner
• Do not drop, sit on, or step on the amplier
or sensors.
• Check if your subject has a sensitive
dermatological condition causing sensor
intolerance.
• Avoid cross-subject contamination. Do not
use with subjects having open wounds or
scalp infections.
• The Dev Kit headset is not a diagnostic
tool. Any medical diagnosis related to
the EEG should be derived by a certied
physician.
SubjectConsiderations
• This device is intended for human use only.
• Subject should have a healthy scalp.
• Do not use with infants or neonates.
• Test subjects may or may not have hair.
• All sensors must be able to contact the
subject’s scalp.
• The entire headset may come into contact
with the subject’s skin.
FollowTheseAdvisoriesToKeepYour
DevKitInGoodWorkingOrder
• Do not immerse the amplier, sensors, or
leads in liquid.
• Do not expose the system to direct
sunlight or heat source, moisture, vibration,
mechanical shock, excessive dust, or
humidity.
• Do not open, modify or disassemble the
amplier — this will void the warranty.
• Do not use if the amplier or any
accessories are damaged.
• Do not use when amplier or leads are wet.
• Do not use caustic or abrasive cleaners on
the system or sensors.
AlwaysUseSuppliedAccessories
Using accessories other than those supplied
with your Dev Kit system may result in
damage or diminished ecacy of the system.
The Dev Kit uses an internal Lithium-ion
rechargeable battery.
AvoidCross-SubjectContamination
Clean the device and clean or replace
sensors after use following the cleaning
instructions to avoid cross-subject
contamination.

3
DeviceOverview
DevKitOverview
EEG is the measurement — through the use of sensors and
ampliers — of scalp surface electrical potentials arising
from activity in the cortex.
The Dev Kit is exible and adaptable to a wide variety
of custom EEG experiments. The eight sensor leads
can be placed anywhere around the head, and the
fabric headband keeps sensors in place around the
circumference of the head.
The Dev Kit meets the
mechanical, electrical, and
sensor needs required to
make an eective dry EEG
system.
Conventional wet systems
rely on electrolytic gels
to penetrate hair, contact
the skin, and provide a
conductive path. The gel
serves as a buer lling in
gaps between the sensor
and skin.
No conductive gel is used in a
dry system. The benets are
obvious: faster set-up, and no
after-use clean-up required.
Dry systems are subject to
several challenges. First, the
sensor must directly touch the
scalp or skin, even through
thick hair. Second, the sensor
must remain securely in place
to minimize artifacts and
noise. Finally, the electronics
must tolerate impedances up
to 200 times higher than wet
systems — while rejecting
noise and interference. A
high-end dry solution — like
the Dev Kit — balances
sensors, mechanics and
electronics achieving virtually
the same signal quality as a
traditional wet cap for most
EEG applications.

4
DeviceOverview
ThePackageContains
TheFollowingItems
Dev Kit Amplier
Bluetooth Dongle
1 Passive Ground Lead Wire
9 Active Lead Wires
10 Flex Sensors
10 Drypad Sensors
10 HydroFlex Sensors
30 Skintact Sensors
Headband
Wall Charger
Carrying Case
Manual
DevKitwithHeadband
Sensors
Active Lead Wires
Amplier
Headband
Optional AurisDK in-
ear sensors available
separately.

5
DeviceOverview
Amplifier
Wireless amplier
collects signals
and transmits to
Bluetooth Dongle.
BluetoothDongle
High-speed receiver
dongle plugs into
your computer’s
USB port.
ActiveLeadWires PassiveGround
LeadWire
Active lead wire
(3.5mm connector)
for EEG channels.
Passive lead
wire (touchproof
connector) for
Ground.
HydroFlexSensor
HydroFlex
sensors are extra
comfortable for
direct skin contact
and through-hair
applications.
FlexSensor
Flex sensors slide
through hair for
high-quality scalp
contact.
DrypadSensor
Drypad sensors
make direct
skin contact for
ECG and EEG
recordings.
AurisDKIn-Ear
Sensors
Optional in-ear
sensor with
replaceable foam
inserts.

6
Preparation
1.InstallTheSoftware

Note:CGXAcquisitionsoftwarerunsonWindows
only.
• Navigate to CGXSystems.com
• Select Software from the top navigation menu.
• Select DownloadunderCGXAcquisitionSoftware
• Choose the latest version link under “Downloading and
Installing the Software.”
• Extract the zipped le to your desktop.
• Run CGX Setup and follow the instructions.
• If you see a security warning, select MoreInfo and Run
Anyway
• The software will create a shortcut on your desktop.
Download the latest software
from CGXSystems.com
2.ChargetheInternalBattery
Allow your Dev Kit to fully charge before each use. The
device has a charging indicator light:
• The charging status light is red when the battery is
charging.
• The charging status light is green when the battery is fully
charged.
3.CheckPowerStatusandTriggerStatusLightsOn
TopOfAmplifier
Power
Off Headset O
Green Headset On
Yellow Low Battery
Red Critically Low Battery (replace immediately)
Trigger
The Trigger Status Light is for use with the optional CGX
Wireless StimTrigger, and indicates when the headset is
receiving trigger signals from the StimTrigger unit.
Off Wireless StimTrigger Out Of Range
Blue Wireless StimTrigger In Range
Charging
Charger
Input
Charging
Status Light
Amplifier
Power Button
Power Status
Light
Status light for optional
Wireless StimTrigger

7
Preparation
4.InsertBluetoothDongle
Plug the dongle into your computer and Windows should
automatically install the correct drivers. Verify driver
installation by checking the Device Manager for problems,
marked by a yellow exclamation mark.
• The dongle is specic to each headset.
• For best performance, ensure a clear line of sight
between the dongle and the front of the headset
If Windows did not successfully install the driver for the
dongle, refer to the FTDI driver installation manual on
our website.
Each Dev Kit is permanently paired to a receiver dongle.
The pair automatically discover and initiate a connection
when both are powered on and within a 10m range.
The light on the dongle indicates its current state:
Green Power On, Not Paired
Purple Searching For Device
Blue Device Found
FlashingBlue Data Transmitting
5.StartTheAcquisitionSoftware
Once you’ve established a connection, data should begin
to stream.
Double click on the CGX Acquisition software icon. You
should see CGXDevKitunder DiscoveredDevices.
If you do not see the name CGX Dev Kit, remove and
re-insert the dongle and restart the software.
1. First, click the device name in this window to select the
Dev Kit
2. Then click Connect.
You should now see the device conguration window.
If you do not, double check to make sure the
Dev Kit is powered on.
Click StartDevice.
You will now see data streaming into the display. Click the
Channels tab on the top right-hand side of the program.
This will bring you to the impedance check. You are now
ready to use the device.
Dongle
Status Indicator Light

8
Preparation
6.SelectSensors
Drypad Sensors
Use Drypad sensors in positions where the subject has no
hair (forehead and bald areas).
Flex Sensors
Use Flex sensors to penetrate hair. On most subjects, these
are all the positions except Fp1, Fp2, F7 and F8.
HydroFlex Sensors
Use moistened HydroFlex sensors to penetrate hair, and
with sensitive subjects. Moistening with a dab of water prior
to use improves signal quality in dry environments.
Skintact Sensors
Use Skintact sensors for direct skin contact.
AurisDK In-Ear Sensors (optional)
Use AurisDK sensors for in-ear measurements.
7.Typical8-ChannelMontageUsingTheHeadband
This is a typical circumferential montage, with Reference at
the mastoid, and Ground set where convenient.
1. Insert the headband through the mounting slots on the
amplier.
2. Plug the passive touchproof ground connector into the
GGround port.
3. Plug an active 3.5mm lead into the RReference port.
4. Attach Skintact sensors to the Reference and Ground
leads. Ensure good contact between these sensors and
the skin.
Note: Reference and Ground contacts are essential to
the functioning of the device.
5. Connect as many leads as desired to the Dev Kit and
attach the sensor of your choosing to the end of each
lead.
6. Place the sensors around the head using the headband
to secure the leads in place.
Drypad Sensor for
direct skin contact
Flex Sensor for hair
HydroFlex Sensor for
sensitive subjects
AurisDK In-Ear Sensors
available separately
It may require extra pressure
to insert a sensor due to
variability in surface coating.
Try that sensor in an alternate
pod location in case of a
particularly tight t.
AttachSensorToLead

9
8.OptimizeSensorContact
After properly positioning the sensors on the subject, obtain
direct contact on all sensors before recording.
Bring up the impedance check in the CGX Data Acquisition
software under the Channels tab. The impedance check
presents a color-coded map of the sensors on the device,
corresponding to contact level:
Red Impedance out of range
(>5,000 kΩ default)
Light Green Impedance at top end of range
(2,500-5,000 kΩ default)
Dark Green Impedance at bottom end of range
(<2,500 kΩ default)
The range of impedances with dry sensors may be higher
than what you are accustomed to when working with
conventional wet sensor ampliers. CGX devices utilize
a combination of advanced electronics, shielding, and
mechanics to obtain EEG signals even when contact is
poor, and can tolerate sensor impedance up to 5,000 kΩ.
9.AdjustSensors,IfRequired,ToImprove
ImpedanceMeasurements
Check for acceptable impedance measurements on each
channel.
To ensure good impedance measurements:
• Lift the sensor slightly to move hair aside.
• Lower the sensor back in place, keeping the sensor
aligned to the subject’s head.
• Lightly press down, holding for 5 seconds, then gently
release the sensor.
10.RecordAnEEG
After you have acceptable impedance levels, click Record
under the Device tab to begin your recording. To end the
recording, under the same tab, click StopRecording.
11.EndTheSession
Close out the current le in the software if one is active and
exit the program. Press the power button once to turn o
the device.
DonningInstructions
Ground must be applied for
impedance check to operate.
ImpedanceMap
UnderTheChannelsTab
Marginally
Acceptable Unacceptable
Acceptable
PositionOfTheSubject
DuringEEG
Use the Dev Kit headset
for subjects in an upright
position. Do not let the
subject lie or sleep on the
sensors. It may damage the
system.

10
CleaningAndMaintenance
To avoid cross-subject contamination, follow the cleaning
instructions to clean sensors, amplier, and headband after
each use.
This device is not intended to be sterilized in an autoclave.
CleaningSensors
• Use hand sanitizer or 70% isopropyl-based alcohol wipes
to clean Drypad and Flex sensors according to cleaning
agent instructions.
• Do not use 90% or 99% alcohol. These solutions will
damage the sensors.
• Check sensors regularly. Sensor functionality is important
to maintaining signal quality. Replace sensors if signal
quality degrades.
• Contact CGX for replacement sensors.
CleaningTheLeadsandAmplifier
• Use 70% isopropyl-based alcohol wipes to clean the
leads and amplier.
• Do not use 90% or 99% alcohol. These solutions will
damage the system.
Storage
• Transport system in the case.
• Store in a temperature and humidity controlled room.
DoNotLetTheAmplifierComeIntoContact
WithLiquid
Immediately turn o the system out and let the amplier dry
completely before resuming use.
DisposalInstructions
To protect the environment, always follow local law, rules,
and policies regarding electronic and battery disposal. You
may also return the device to CGX for proper disposal.

11
The most important aspect of EEG recording is that
output data is only as good as the recording input. While
algorithms exist to remove artifacts, poorly recorded data
cannot be xed in post processing.
Recording good EEG data requires preparation of the
participant for optimal sensor contact:
1. Participants should have their hair recently washed
and fully dried before recording. Wet hair, hair gel,
conditioners, and hair spray may cause interference and
degrade signal quality.
2. Clean each sensor location on the head with a cotton
swab soaked with alcohol.
3. In the event of diculty establishing good contact, apply
a small amount of water between the sensor and scalp
to create an electrical bridge.
4. It is important for subjects to reduce tension in the
head, neck, and shoulders during readings.
ObtainingCleanEEGData
TypicalCleanDataRecording
This is a representation of a
clean data recording.

12
UnderstandingReadings
Traces are thin and deviate
minimally from the axis.
CleanDataAtDefaultScale
Eye blinks will generate
muscle artifacts in the
frontopolar locations (Fp1
and Fp2) and less so in
frontal sensors (F3/F4, F7/F8),
overshadowing brain activity
in EEG recordings.
Blinks
Moving the eyes will generate
muscle artifact in the forehead
and front of the head. A high
concentration of neurons
in the eyes generate strong
electromagnetic elds, so eye
movement causes disruptions
in the EEG recording.
EyeMovement

13
Jaw clenching may aect
most or all channels,
especially if clenching hard.
Light jaw clenching or
tightness can be observed
in F7/F8, T3/T4. Take note
of any temporomandibular
joint disorders: these can
cause artifact without typical
clenching.
The tongue is a large
polarized muscle, with the
tongue’s tip negative with
respect to the base of the
tongue. When the tongue
moves around the mouth,
it generates a moving eld
causing recording disruptions.
Disruptions may be seen
down the midline (Fz, Cz, Pz).
Tongue movement during
talking can be seen on many
channels.
UnderstandingReadings
MuscleArtifact:JawClench
MuscleArtifact:TongueMovement
Swallowing invokes
movement of several muscles
in the mouth, including the
tongue, causing disruption
of many channels. Ignore
swallowing if infrequent, but
frequent swallowing may limit
usable data.
MuscleArtifact:Swallowing

14
Neck tension may aect
channels on the back of the
head, predominantly O1/O2,
but also in parietal sensors
(Pz/P3/P4, P7/P8). Subjects
should be comfortably seated,
with appropriate bracing at
the back and neck. Avoid
slouching.
Brief disruptions in contact
between sensor and scalp
may cause “sensor pops” on
recordings. Occasional pops
can usually be ignored in
processing, but if the problem
persists, check the contact
between the sensor and
scalp. Wipe popping locations
with a small amount of alcohol
on the sensor.
MuscleArtifact:NeckTension
HeadsetOrElectrodeDisruptions:SensorPops
UnderstandingReadings
Excess or quick movement
of the head may disrupt
connection between sensors
and scalp causing data
artifacts as shown.
HeadsetOrElectrodeDisruptions:HeadMovement

15
EEG sensors are sensitive
enough to detect small
electrical signals on the
cortex. Occasionally, sensors
may lie directly atop a blood
vessel. When this occurs,
sensors may detect the
subject’s pulse. Slightly move
the sensors to reduce pulse
artifacts.
Power lines operate between
50 and 60 Hz. Unsecure
power sources may leak
electromagnetic frequencies.
Because EEG records
frequencies from 1hz to about
40hz, power line noise may
negatively impact recordings
on all channels. This is
especially the case when
connection between sensor
and scalp is poor.
UnderstandingReadings
PulseArtifact
MildPowerLineArtifact
To avoid power line artifacts,
have subjects sitting at
least 3 feet from power
cords, plugged-in devices,
and lighting or overhead
uorescent lights. The
Dev Kit shields the sensors
from environmental noise,
but issues can still occur with
poor skin contact.
StrongPowerLineArtifact

16
UnderstandingReadings
There are a multitude of
recording errors when the
A1 reference earclip is not
connected to the subject.
The most common are:
• Impedances match or
nearly match at a low value
but do not appear on the
display or in the impedance
head map. (g. 1)
• No traces appear and
impedance values are zero.
(g. 2)
• No traces appear and
impedance values are high.
(g. 3)
ImproperSetup:NoConnectedReference
g. 1
g. 2
g. 3

17
UnderstandingReadings
When the reference channel
is touched or jostled, all
channels will be aected.
Avoid disrupting the
Reference position during
use.
When the reference is
disconnected, all channels will
disconnect as well.
ImproperSetup:ReferenceContact
ImproperSetup:ReferenceDisruption
If the ground has poor
contact, all channels will be
impacted. Avoid disrupting
the connection of the Ground
lead during use.
ImproperSetup:GroundDisruption

18
SoftwareReference
DeviceConfiguration
• DiscoveredDevicesConnected dongles will be listed
here. Select the device name of your system and hit
Connect.
• The software automatically connects to your device to
retrieve stored settings.
• The DeviceConfigurationwindow is only for your
information; changing the settings will not change the
conguration of the device. If you need to change device
conguration, contact support at CGX.
DataRecording
• Record Click to open a le dialog. Select the desired
location, le name, and le type. (CSV les have a time
stamp built in). Recording begins when you press OK.
• ToStopRecordinghit the button again. Elapsed time is
shown in the box above the button.
• StartLabStreamingLayerHit the Start
LabStreamingLayerbutton.
• StartRDAServer To use the BCI2000 software with the
Data Acquisition Software, click on this button. Then,
connect to the application in BCI2000.
• Timer The timer allows you to limit le recording to a
specic length.
DeviceTab

19
SoftwareReference
DisplayTab
The display tab controls
scaling and other viewing
parameters for the signals.
Scaling:Headset
• Time sets the x axis time window. By default, it is set to 2
seconds.
• Scale(EEG) sets the y axis vertical gain for the EEG
channels on the head.
• Scale(ACC) sets the y axis vertical gain for the
accelerometer channels.
• Channels sets the maximum number of channels
displayed per screen. To ip through the pages of
channels, use the option below.
• ShowPage switches between dierent pages of
channels.
Scaling:AIM-2(Optional)
Filtering
• HighPass sets the oor (removes osets and slow
signals) corner frequency for the display.
• Lowpass sets a ceiling (removes high frequency signals
and noise) corner frequency for the display.
• Note: ltering is for display only. Data les are saved
raw and unltered to preserve the maximum amount of
information.
MaskHi-ZChannels
Threshold hides channels with sensor impedances above
the specied threshold from the display.

20
SoftwareReference
The top half of the Channels
tab contains a table
displaying information about
each channel in the system
including its number, name,
contact impedance (Z (kΩ))
and sensor oset (O (mV)).
The oset is calculated
relative to the reference
channel.
ChannelsTab
The bottom half is a graphical map of sensor contact
quality. Red circles indicate poor contact, whereas light
green circles indicate acceptable contact. Dark green
circles indicate ideal contact.
The threshold for this contact quality is, by default:
Red Above 5000 kΩ
LightGreen Between 2500-5000 kΩ
DarkGreen Below 2500 kΩ
This threshold can be changed with the Mask Hi-Z menu
on the display tab.
Red 100% or greater of Hi-Z threshold
LightGreen Between 50%-100% of Hi-Z threshold
DarkGreen Below 50% of Hi-Z threshold