Electroencephalographs - Revision history

BernardoDalSeno at 15:16, 18 October 2008

2008-10-18T15:16:07Z

BernardoDalSeno: Moved "Presets in Galileo" in the software page

2008-10-18T15:15:42Z

Moved "Presets in Galileo" in the software page

TizianoDalbis: /* Links */

2008-10-18T07:37:10Z

‎Links

TizianoDalbis at 07:32, 18 October 2008

2008-10-18T07:32:15Z

TizianoDalbis: /* Electrodes Cap */

2008-10-18T07:16:11Z

‎Electrodes Cap

TizianoDalbis at 07:15, 18 October 2008

2008-10-18T07:15:59Z

TizianoDalbis: /* How to set up BCI instrumentation */

2008-10-18T07:09:24Z

‎How to set up BCI instrumentation

TizianoDalbis: /* BeLight */

2008-10-18T07:08:12Z

‎BeLight

BernardoDalSeno: /* Booking */

2008-10-07T15:58:12Z

‎Booking

FrancescoAmenta at 07:26, 23 September 2008

2008-09-23T07:26:43Z

@@ Line 14: / Line 14: @@
 In order to book the electroencephalograph, please go to the [[IIT-Lab#Booking |IITLab page]], where you can update a table with your new bookings.
 === Electrodes ===
@@ Line 31: / Line 29: @@
 Please take into account also the time for electrode cleaning when you plan your EEG acquisitions.
 == Links ==

← Older revision		Revision as of 15:15, 18 October 2008
Line 34:		Line 34:


−	~~== Presets in Galileo ==~~

−	~~Description of the presets saved in the Galileo software.~~
−
−	~~===P300===~~
−	~~Used for P300 and ErrP recordings. There are 4 EEG channels, 1 EOG, 2 external signals in DC; sampling frequency is 512 Hz.~~
−	~~;Channels and connectors:~~
−	~~:'''EOG''': EOG, input "A"; the "+" input for the electrode above the eye, the "-" input for the one below~~
−	~~:'''Fz''': Fz, input 7~~
−	~~:'''Cz''': Cz, input 12~~
−	~~:'''Pz''': Pz, input 17~~
−	~~:'''Oz''': Oz, input 20 (labeled as "O1" on the amplifier)~~
−	~~:'''Sync''': phototransistor for stimulus synchronization; positive lead (red) in input 22, negative lead (black) in input NEP~~
−	~~:'''Button''': button, used for target signaling; positive lead in input 23, negative lead in input NEP. If it's not used, please short the input 23 with NEP.~~

	== Links ==		== Links ==

← Older revision		Revision as of 07:37, 18 October 2008
Line 52:		Line 52:

	* [[Brain-Computer Interface]] page on this Wiki		* [[Brain-Computer Interface]] page on this Wiki
−	* [[~~EEG Montage]] for instructions on how~~ to mount electrodes	+	* [[How to mount electrodes]]
		+	* [[How to setup BCI software]]

← Older revision		Revision as of 07:32, 18 October 2008
Line 33:		Line 33:


−	~~== How to set up BCI instrumentation ==~~
−
−	~~You’ll nedd:~~
−
−	* Electroencephalograph (with PCMCIA connector)
−	* Laptop (ensures that the AC adapter is NOT connected, for safety reasons)
−	* Electrodes or an Electrodes Cap (designed for the 10-20 system)
−	* Conductive gel and/or abrasive electrode-gel
−	* Tape measure to put in the correct position the electrodes
−	* Adhesive tape (if using single electrodes to fix them)
−	* Syringe (if using electrodes cap, to insert the conductive gel into the electrodes hole)
−	* Fototransistor (if necessary)
−
−	~~Before starting, be sure that the Electroencephalograph AC adapter is far away from the patient because 50Hz can interfere and destroy EEG signal.~~
−	~~Mobile phones can be another source of noise: it is better to switch them off before while performing the acquisition.~~
−	~~In order to acquire the brain signal, it is possible to use an electrodes cap, or a set of separated single electrodes.~~
−
−	~~=== Electrodes cap ===~~
−
−	~~Choose the suitable size for the patient, and then put the cap on his head in the correct position:~~
−
−	* measure his head size (from the nasion NS to the inion) this is the 100% of the measure
−	* now you can put the CZ electrode at 50% of the entire measure, and check the positions of the other electrodes (i.e. FP1 and FP2 should be at 10% of the measure from nasion) .
−	* fill in the electrodes with conductive gel (use the syringe), take care that hair don’t disturb the skin-electrode contact.
−	* remember to fill with condutictive gel also to electrodes cabled in red (NE=Neutral Electrode) and green (ISOGND=Isolated Ground) that are used respectively as reference (RF) and ground values in the measurements.
−	* connect the cable to the Electroencephalograph.
−
−	~~=== Separeted electrodes ===~~
−
−	~~If you haven’t got an electrodes cap you can position them one by one following this figure, with the relatives measures of each electrode:~~
−
−	~~[[Image:10-20System.jpg]]~~
−
−
−	~~Connect the reference electrode to the forehead and the GND electrode to the right earlobe.~~
−	~~Before connecting one electrode, put a little bit of abrasive gel on a cotton fioc and scratch the portion of patient’s skin where you’ll put the electrode.~~
−	~~Fill in the electrode with a little bit of conductive gel, and put it on the skin, in the correct position.~~
−	~~Fix the cable with adhesive tape, and connect it to the Electroencephalograph.~~
−
−	~~=== EOG ===~~
−
−	~~If you want to eliminate EOG artefacts from your data acquisitions, you would record EOG signal putting 2 more electrodes, near the patient eye.~~
−	~~One electrode just over the eyebrow and one under the eye (REF) , like in the picture:~~
−
−	~~[[Image:ElectrodesEyes.png]]~~
−
−	~~Connect the EOG cables to the A-Channel of the Electroencephalograph.~~
−
−	~~=== Impedance check ===~~
−
−	~~Now you can start Galileo Software and check if the correct values of impedance are measured.~~
−	~~Click on the button “OHMMETER” in the upper toolbar, and the system will display the calculated value for each electrode, both in “graphical” form and in “numerical” one.~~
−	~~Values under 10 KOhm are acceptable, values under 5 KOhm are very good.~~
−	~~If your values aren’t under 10KOhm try to decrease them, filling the electrodes with more conductive gel until you reach acceptable values.~~
−
−	~~== BCI2000 and Galileo ==~~
−
−	~~[http://www.bci2000.org BCI2000] is a general-purpose software system for BCI research developed by the Wadsworth Center of the New York.<br/>~~
−	~~In our project BCI2000 is used for:~~
−	* data storage,
−	* stimulus presentation,
−	* on-line feedback applications.
−
−	~~Since our EEG amplifier is not directly supported by BCI2000, data acquisition is performed instead by ''Galileo'' that is the software provided with the EEG amplifier. <br/>~~
−	~~Galileo and BCI2000 communicate by means of two components:~~
−	* AirBat: a custom plugin for Galileo that sends the acquired data to GalileoSource through a pipe,
−	* GalileoSource: the data source seen by the other modules of BCI2000.
−
−	~~BCI2000 implements a client server architecture. When the server (operat) is launched it starts waiting for all the others modules to connect:~~
−	* the data source (in our case it is GalileoSource);
−	* the filter;
−	* the application.
−	~~When all these components are ready it is possible to start modifying the configuration parameters and finally run the application. <br>~~
−	~~Note that GalileoSource will be ready only when the connection with AirBat is correctly established. <br/>~~
−	~~Thus the correct order in which the components should be launched is the following:~~
−	~~# start operat;~~
−	~~# start GalileoSource;~~
−	~~# start the filter component;~~
−	~~# start the application component;~~
−	~~# from Galileo start a new data acquisition with the AirBat plugin.~~

	== Presets in Galileo ==		== Presets in Galileo ==

@@ Line 50: / Line 50: @@
 In order to acquire the brain signal, it is possible to use an electrodes cap, or a set of separated single electrodes.
-=== Electrodes Cap ===
+=== Electrodes cap ===
 Choose the suitable size for the patient, and then put the cap on his head in the correct position:

@@ Line 88: / Line 88: @@
 If your values aren’t under 10KOhm try to decrease them, filling the electrodes with more conductive gel until you reach acceptable values.
-== Presets ==
+== BCI2000 and Galileo ==
 Description of the presets saved in the Galileo software.

@@ Line 33: / Line 33: @@
-=== How to set up BCI instrumentation ===
+== How to set up BCI instrumentation ==
 You’ll nedd:
@@ Line 50: / Line 50: @@
 In order to acquire the brain signal, it is possible to use an electrodes cap, or a set of separated single electrodes.
-==== Electrodes Cap ====
+=== Electrodes Cap ===
 Choose the suitable size for the patient, and then put the cap on his head in the correct position:
@@ Line 60: / Line 60: @@
 * connect the cable to the Electroencephalograph.
-==== Separeted electrodes ====
+=== Separeted electrodes ===
 If you haven’t got an electrodes cap you can position them one by one following this figure, with the relatives measures of each electrode:
@@ Line 72: / Line 72: @@
 Fix the cable with adhesive tape, and connect it to the Electroencephalograph.
-==== EOG ====
+=== EOG ===
 If you want to eliminate EOG artefacts from your data acquisitions, you would record EOG signal putting 2 more electrodes, near the patient eye.
@@ Line 81: / Line 81: @@
 Connect the EOG cables to the A-Channel of the Electroencephalograph.
-==== Impedance check ====
+=== Impedance check ===
 Now you can start Galileo Software and check if the correct values of impedance are measured.

@@ Line 13: / Line 13: @@
 === Booking ===
-<!-- Please keep the table lines ordered by time (nearest bookings first); add new entries like this:
+In order to book the electroencephalograph, please go to the [[IIT-Lab#Booking |IITLab page]], where you can update a table with your new bookings.
----CUT---
-| Monday 13 March || 11:00-18:00 || Donald Duck
-|-
----CUT---
-Use abbreviations, if you like.
-Please remove old entries.
--->
-−
-{| border="1"
-! Day !! Time !! Person
-|-
-| Wednesday 24 September || 09:00-13:00 || Rossellla
-|-
-| Thursday 25 September || 10:00-19:00 || Bernardo
-|}
 === Electrodes ===