Cognionics CGX Mobile-128 User manual

Mobile-128
This manual contains general operating instructions, precautionary measures,
maintenance instructions, and information for use of the CGX Mobile-128.
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
Description
The Mobile-128 is a wireless, high
density gel EEG system.
The amplifier provides wireless
acquisition of recorded EEG signals.
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 Mobile-128 provides research
grade signal quality and is ideally
suited for high-density EEG and
ERP research in laboratory and field
environments.

2
Warnings
TheMobile-128isintendedtobeused
toacquiretheelectroencephalogram
(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
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 the product.
• The Mobile-128 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.
FollowTheseAdvisoriesToKeepYour
Mobile-128InGoodWorkingOrder
• Do not immerse in liquid.
• Do not expose 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 damaged.
• Do not use when wet.
• Do not use caustic or abrasive cleaners
on the headset or sensors.
AlwaysUseSuppliedAccessories
Using accessories other than those
supplied with your Mobile-128 system may
result in damage or diminished ecacy of
the system.
DeviceOverview
Mobile-128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 Mobile-128 system includes a
EEG Cap following the 10-5 standard
for EEG. The 10-5 EEG Caps derive
their name from measurements of 5%
of the distance between landmarks on
the head, specically, the depression
above the bridge of the nose (nasion),
the bump at the back of the head (inion),
and the depressions in front of each ear
(preauricular points).
Sensors are labeled with a combination
of letters and numbers indicating their
respective locations, with even numbers on
the right and odd numbers on the left side
of the head. Midline locations are marked
with a “z” for “zero.” For instance, Fz sits on
the frontal midline, while F3 sits left of and
F4 sits right of Fz.
The Mobile-128 comes standard with caps
at 54 cm, 56 cm, and 58 cm. Other sizes
are available upon request.

3
DeviceOverview
ThePackageContainsThe
FollowingItems
Mobile-128 Amplier
Mobile-128 Electrodes
Mobile-128 Electrode Breakout Box
3 EEG Caps (54 cm, 56 cm, 58 cm)
Harness
Bluetooth Dongle
2 Syringes
3 Tubes EEG SignaGel
2 Rechargeable Li-Ion Batteries
1 Charger
Carrying Case
Manual
Breakout
Box and
detachable
Amplier
Harness holds the
Breakout Box and
Amplier
Mobile-128Headset
Electrodes
Chin Strap
Electrode
Bundle

4
Preparation
1.InstallTheSoftware

Note:CGXAcquisitionsoftwarerunsonWindows
only.
• Navigate to CGXSystems.com
• Select Downloads from the top navigation menu.
• Select ClickHereFor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.
2.AttachElectrodeBreakoutBoxToHarness
Use the velcro strips to hold the Electrode Breakout Box
snug against the harness.
3.AttachElectrodesToTheCap
Slide electrodes into their housings. Use the montage map
to locate each channel.
ElectrodeColorGuide
Green Electrodes: 20 channels in a traditional 10-20
montage.
Blue Electrodes: 48 additional channels creating a 10-10
64-channel montage.
Purple Electrodes: 64 additional channels creating a 10-5
128-channel montage.
See printed HeadmapInsert for electrode locations.
4.ChargeandInserttheBatteriesIntoTheAmplifier
Allow the batteries to fully charge before each use. Place
batteries in the Amplier.
5.SnapTheAmplifierOntoTheBreakoutBox
Carefully push at the center of the Mobile-128 Amplier
when installing.
Download the latest software
from CGXSystems.com
Slide electrodes into housing
until you hear a snap.
64 Channel
128 Channel
20 Channel
ElectrodeColorGuide
Slide batteries into
compartment.
Attach Amplier to Electrode
Bundle Breakout Box.

5
Preparation
6.CheckPowerStatus,TriggerStatus,andBattery
StatusLightsOnTheAmplifier
Power
Off Headset O
Green Headset On
Yellow Low Battery
Red Critically Low Battery (replace immediately)
Trigger
Off Trigger Out Of Range
Blue Trigger In Range
Flashing Blue Triggers Received
Battery
Off Battery OK
Red Battery Low
FlashingRed Battery Critically Low
7.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 Mobile-128 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
8.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Mobile-128under DiscoveredDevices.
If you do not see the name CGX Mobile-128, remove
and re-insert the dongle and restart the software.
Power Trigger Battery
Green Idling
Purple Searching For Device
Blue Device Found
FlashingBlue Data
Transmission
IndicatorLightsOnDongle

6
Preparation
ImpedanceMap
UnderTheChannelsTab
Marginally
Acceptable Unacceptable
Acceptable
Click the device name in this window to select the
Mobile-128 and click Connect.
You should now see the device conguration window.
If you do not, double check to make sure the
Mobile-128 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.
9.PlaceTheEEGCapOnTheSubject’sHead
• Pull the cap down onto the subject’s head aligning with
these head landmarks:
Cz on the crown of the head
Fp1/Fp2 ~1cm above browline
Ears through cutouts in cap
• Ensure cap is centered on the head, with Fpz, Fz, FCz,
down the midline.
• Connect straps under chin to keep headset securely in
place.
• Apply a small amount of gel to Reference and Ground
positions behind the ears and gently press these
positions to activate impedance check. This will cause
all channels to display red and only 3 ACC channels to
appear in the main window.
• Apply a small amount of gel to each position on the head.
10.OptimizeSensorContact
After properly positioning the headset on the subject,
obtain direct contact on all sensors before recording.
Note: Gel may take up to a minute to warm up and soak
through hair. Apply gel to all channels rst. Gently press
on locations that have not connected. If necessary, apply
more gel, and gently rotate the applicator inside the sensor
against the scalp to move hair.
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 (>100 kΩ default)
LightGreen Impedance at top end of range (50 - 100
kΩ default)
DarkGreen Impedance at bottom end of range (<50 kΩ
default)
20 Channels Shown For Clarity

7
PreventativeCareToMaintainSafetyAndEffectiveness
To avoid cross-subject contamination, follow the cleaning
instructions to clean sensors and headset after each use.
This device is not intended to be sterilized in an autoclave.
CleaningTheMobile-128Amplifier
• Use hand sanitizer or alcohol wipes to the Mobile-128.
CleaningTheElectrodeBreakoutBox
• Remove Amplier from Electrode Breakout Box.
• Remove excess gel.
• Use hand sanitizer or alcohol wipes.
Storage
• Always remove batteries when headset is not in use.
• Transport headset in the case.
• Store headset without the batteries.
DoNotLetTheHeadsetComeIntoContactWith
Liquid
Immediately take the batteries out and let the headset dry
before resuming use.
KeepSoftwareUpdated
Make sure software is up to date. Go to CGXSystems.com
for latest updates.
DisposalInstructions
To protect the environment, always follow local law, rules,
and policies regarding electronic and battery disposal. You
may also return the headset to CGX for proper disposal.
11.AdjustElectrodesIfRequired
• Use the impedance check to make sure impedances are
within acceptable thresholds.
• If channels do not appear shortly after applying gel, check
left ear (Ref) and AFz (Gnd) contact and add more gel if
necessary.
12.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.
13.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.
Preparation

8
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.
Mobile-128 sensor locations
lie within 1.0 centimeters on
the vast majority of hand-
measured 10-5 placements
on heads sized from 52-62
centimeters.

9
UnderstandingReadings(20ChannelsShownForClarity)
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

10
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(20ChannelsShownForClarity)
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

11
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(20ChannelsShownForClarity)
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

12
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. Unsecured
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(20ChannelsShownForClarity)
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
Mobile-128 shields the
sensors from environmental
noise, but issues can still
occur with poor skin contact.
If power line artifacts appear
on all channels, lightly wet A1
Reference Drypad Ear Sensor.
StrongPowerLineArtifact

13
UnderstandingReadings(20ChannelsShownForClarity)
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

14
UnderstandingReadings(20ChannelsShownForClarity)
When the reference channel
is touched or jostled, all
channels will be aected.
Avoid disrupting the A1
Reference earclip 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 A1
Ground earclip during use.
For best results, lightly wet A1
Reference Drypad Ear Sensor.
ImproperSetup:GroundDisruption

15
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

16
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.

17
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 A1.
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

18
SoftwareReference
MarkersTab
ReceivedTriggers
• The box shows all of the received triggers chronologically.
• If no trigger is in range, value received will be 47831 (in
hex: 0xBAD7).
• ClearHistoryThis button will clear all of the triggers in the
box. It will not delete triggers from the recording itself.
InsertManualTriggers
• You have the option to select any one of eight trigger
codes to insert into the recording. These will be inserted
in the same way as a normal trigger sent from our
Wireless StimTrigger. However, we recommend only using
the trigger for precision event marking, and to use these
software triggers for general annotation.
TCPTriggers
• PortNumber Allows you to choose which port to receive
triggers.
• StartTCPReceiver Starts the receiving service.
• Do not use for precision event marking.
• For general annotation only.

19
SoftwareReference
StatusTab
Transmission
• DataRate Allows you to see the bandwidth being used
for the data being sent.
• CompressionRatio Shows you the ratio at which data is
being compressed and sent to the computer.
• LostPacketsShows the amount of information dropped
in communications between the headset and the
computer, increasing as the headset moves away from
the computer.
• AIMSensors (not applicable)
• BatteryLevel Battery status is displayed at the bottom of
this tab. The Mobile-128 only uses Batt: A.

Specifications
CoveredbyPatentsissuedand/orpendingunderlicensefromCognionics,IncUS9314183B2,
US9615761B2, US9935726B2, US8798710B2, and International patents. © 2021 CGX, LLC. Doc: M128010121
8445 Camino Santa Fe, #213
San Diego, CA 92121
858-864-9400
[email protected]
CGX A Cognionics Company
Imported By:
Brain Products GmbH
Zeppelinstrasse 7
82205 Gilching, Germany
www.brainproducts.com
Mobile-128Headset
3 year warranty on manufacturing defects.
90 day warranty on accessories and
disposable parts. Warranty is void if the
device has been opened or tampered with.
Returns
All units returned to CGX for repair must
have an RA number issued by CGX.
WarrantyandService
CGX will pay outbound shipping costs only.
Ship all returns with an RA number to:
CGX
Attn:Service
8445CaminoSantaFe,#213
SanDiego,CA92121
A/DResolution 24-bit simultaneous sampling
analog-to-digital converters
SamplingRate 500 samples per second
Bandwidth 0-131 Hz with true DC
coupling
Accelerometer 3-axis measures head motion
Range 10 meters
Noise <1.0 μV RMS from 1-50 Hz,
shorted inputs
Storage microSD
Sensors Active electrodes with
sintered Ag/AgCl contacts,
WirelessType Bluetooth
API Full access to raw data via
real-time streaming API
Impedance
Check
Continuous impedance
check, real-time monitoring
of all channels simultaneous
with EEG
ExportTo EDF, BDF, CSV
Compatible
With
NeuroPype, LabStreaming
Layer, EEGLAB, BCILAB,
MATLAB, BCI2000,
OpenViBE, Neuroguide and
more
BatteryType Lithium-ion
BatteryLife 4 hours wireless
10 hours with micfroSD
UseWith CGX Wireless StimTrigger
AppliedPart Type BF
Weight System: 1000g
Amplier Only: 98g
FitsHeads
Includes 3 caps for heads
sized 54, 56, and 58cm.
Optional caps available for
head sizes from 48 to 62cm.
Dimensions Amplier: 9 x 6 x 2 cm