Subject Preparation: EEG - Revision history

Amnamyst: /* Applying Electrolyte */

2022-01-26T20:20:49Z

Applying Electrolyte

← Older revision		Revision as of 16:20, 26 January 2022
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	<br>		<br>
			'''NOTE:''' You are not required to use Ten/20 paste, however care should be take when selecting an electrolyte solution/paste for use in MEG. Many solutions, if not prepared specifically for use in MEG, may have magnetic contaminants.
			*CTF released the following advisement: [[Image:pdf.png]] [[Media:TA-031-EEG Gel Magnetic Contaminants.pdf\| EEG Gel Magnetic Contaminants]]

	==Electrode Impedance Meter Check==		==Electrode Impedance Meter Check==

Amnamyst: /* Electrode Impedance Meter Check */

2022-01-26T20:08:41Z

Electrode Impedance Meter Check

← Older revision		Revision as of 16:08, 26 January 2022
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	==Electrode Impedance Meter Check==		==Electrode Impedance Meter Check==
	[[File:Grass_Impedance_Meter.jpg\|frameless\|right\|Grass Impedance Meter]]		[[File:Grass_Impedance_Meter.jpg\|frameless\|right\|Grass Impedance Meter]]
	'''The Grass S88 Impedance Meter measures AC impedance (resistance and capacitance). An impedance check should be performed on all electrodes used for EEG or EMG. When two or more electrodes are plugged into the electrode switch positions, all electrodes except the one selected electrode being measured are connected together and provide the reference for the one being measured.~~'''~~		'''The Grass S88 Impedance Meter measures AC impedance (resistance and capacitance).''' An impedance check should be performed on all electrodes used for EEG or EMG. When two or more electrodes are plugged into the electrode switch positions, all electrodes except the one selected electrode being measured are connected together and provide the reference for the one being measured.

	::1. The Electrode Selector Switch should be at Jack position 1 or 2.		::1. The Electrode Selector Switch should be at Jack position 1 or 2.

Amnamyst: /* Applying Electrolyte */

2022-01-21T22:29:41Z

Applying Electrolyte

← Older revision		Revision as of 18:29, 21 January 2022
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	==Applying Electrolyte==		==Applying Electrolyte==


	[[File: Ten_20_Paste_Picture1.png.jpg\|frameless\|right\|Ten/20 Conductive Paste]]		[[File: Ten_20_Paste_Picture1.png.jpg\|frameless\|right\|Ten/20 Conductive Paste]]
	'''Ten/20 Conductive Cream ~~are~~ opaque white, water soluble ~~electrolytes~~ ~~substances~~ used as a conductive and/or fixing/adhering ~~mediums~~ to attach electrodes. Removed with warm water.'''		'''Ten/20 Conductive Cream is an opaque white, water soluble electrolyte substance used as a conductive and/or fixing/adhering medium to attach electrodes. Removed with warm water.'''
		⚫	:'''*If using Ten/20''' - scoop paste into a cup electrode (this paste is too thick to squirt from a syringe).

		⚫	::*Press firmly on the skin.
	::'''*If using Elifix or Abralyt''' - fill a syringe with the cream.
			:'''*If using a liquid electrolyte like Electrogel, Elifix or Abralyt'''
⚫	::~~::-~~ Squirt into the middle of each electrode opening.
			::*Fill a syringe with the solution.
⚫	::'''*If using Ten/20''' - scoop paste into a cup electrode (this paste is too thick to squirt from a syringe).
		⚫	::*Squirt into the middle of each electrode opening.
⚫	::~~::-~~ Press firmly on the skin.
	::'''*Completely fill the electrode space (the space from the skin to the electrode) with cream / paste so that there are no air pockets and the electrolyte makes good contact with the skin.		::'''*Completely fill the electrode space (the space from the skin to the electrode) with cream / paste so that there are no air pockets and the electrolyte makes good contact with the skin.

Amnamyst at 03:40, 21 January 2022

2022-01-21T03:40:46Z

← Older revision		Revision as of 23:40, 20 January 2022
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	\| Reference \|\| Linked Mastoids \|\| Ref (red)		\| Reference \|\| Linked Mastoids \|\| Ref (red)
	\|}		\|}

			== Next Steps ==
			If using EOG, proceed to [[Subject Preparation: EOG\| Subject Preparation: EOG]].
			Otherwise, proceed to ACQ setup and confirm the EEG connections in the ACQ software.

Amnamyst: /* MEG DSQ 3500 Amplifier Setup */

2022-01-21T03:31:47Z

MEG DSQ 3500 Amplifier Setup

← Older revision		Revision as of 23:31, 20 January 2022
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	[[File: MEG DSQ 3500 Amplifier.jpg\|frameless\|right\| MEG DSG 3500 Amplifier]]		[[File: MEG DSQ 3500 Amplifier.jpg\|frameless\|right\| MEG DSG 3500 Amplifier]]

	~~'''~~Located inside the MSR on the table near the MEG machine. The DSQ 3500 Amplifier has inputs for:~~'''~~		Located inside the MSR on the table near the MEG machine. The DSQ 3500 Amplifier has inputs for:

	::*'''Fiducial Coils''' - Nasion, Left Ear, Right Ear, Inion(unused) and Vertex(unused);		::*'''Fiducial Coils''' - Nasion, Left Ear, Right Ear, Inion(unused) and Vertex(unused)
		⚫	::*'''Ground Jack''' - labeled 'Z'
⚫	::*'''21 ~~Unipolar Jacks~~''' - ~~there are 21~~ unipolar channels which measure the difference between an electrode and a common reference channel. The reference channel is common to all of the EEG unipolar channels;
		⚫	::*'''Reference Jack''' - labeled 'REF'
⚫	::*'''8 Bipolar Channels''' - ~~that~~ measure the potential difference between two individual electrodes. These channels are labelled A - G on the jackbox, however, the channels are numbers 56 to 62 in the parameters;
		⚫	::*'''Unipolar channels (21 jacks)''' - unipolar channels which measure the difference between an electrode and a common reference channel. The reference channel is common to all of the EEG unipolar channels
⚫	::*'''ZIF Connector/Jig Connector''' - for the EEG EasyCap System which can accommodate up to 56 electrode positions;
		⚫	::*'''Bipolar Channels (8 jacks)''' - bipolar channels which measure the potential difference between two individual electrodes. These channels are labelled A - G on the jackbox, however, '''the channels are numbers 56 to 62''' in the ACQ parameters
⚫	::*'''Ground Jack''' - Z;
		⚫	::*'''ZIF Connector/Jig Connector''' - connection for the EEG EasyCap System which can accommodate up to 56 electrode positions
⚫	::*'''Reference Jack''' - ~~Ref.~~

	~~'''~~''Please note: There is a Static Dissipation Button which you must touch before touching anything else on the amplifier and before plugging any electrodes into the amplifier~~'''~~''.		''Please note: There is a Static Dissipation Button which you must touch before touching anything else on the amplifier and before plugging any electrodes into the amplifier''.

	<br>		<br>
	::'''If ~~Performing~~ EEG:'''		'''Procedure for EEG:'''
	::Place cerebral electrodes in the numbered jacks / unipolar channels or plug the EasyCap JIF Connector into the input module on the amplifier.		:*Place cerebral electrodes in the numbered jacks / unipolar channels or plug the EasyCap JIF Connector into the input module on the amplifier.

	::*Plug FPz into the ground (Z / green) electrode position.		:*Plug FPz into the ground (Z / green) electrode position.

	::*Plug the both Mastoids into a Linked Electrode Adaptor (Y Connector) then place the single end of the adaptor into the Ref (red) position to link the mastoids together.		:*Plug the both Mastoids into a Linked Electrode Adaptor (Y Connector) then place the single end of the adaptor into the Ref (red) position to link the mastoids together.

	::::{\| class="wikitable"		::::{\| class="wikitable"

Amnamyst: /* EEG Reference Electrode Setup */

2022-01-21T03:02:51Z

EEG Reference Electrode Setup

@@ Line 2: / Line 2: @@
 ==EEG Reference Electrode Setup==
-Reference Electrodes / Mastoid Placement: Used to define the electronics common point.
+Reference electrodes are used to define the common point for the electronics.
-*Clean the skin behind the left and right ear with alcohol and Nuprep Skin Cleaner.  Wipe the skin to remove the gritty residue.
+Attach the reference electrodes to the left and right mastoids (the bone prominence behind each ear).
 <br>

Amnamyst: /* Reducing Skin Impedances */

2022-01-21T02:17:16Z

Reducing Skin Impedances

← Older revision		Revision as of 22:17, 20 January 2022
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	==Reducing Skin Impedances==		==Reducing Skin Impedances==
	[[File: NUPREP_Picture.jpg\|frameless\|left\| Nuprep]]		[[File: NUPREP_Picture.jpg\|frameless\|left\|200px\|Nuprep]]
		⚫	Nuprep is a topical abrasive used for reducing skin impedance. It cleans the skin by removing any natural or applied oil, lotions and/or dead skin. Remove with water.
	[[File: Lemon_Prep_Picture_cropped.jpg\|frameless\|left\|Lemon Prep]]
⚫	~~'''~~Nuprep or ~~Lemon~~ ~~Prep can~~ be used for reducing skin impedance. ~~Both~~ ~~are topical abrasives used to clean~~ the skin to ~~remove~~ any natural or applied oil, lotions and/or dead skin. Remove with water.~~'''~~
	*Insert the wooden end of a cotton swab through the opening of the electrode to push hair aside (in one direction) until the skin is clearly visible.		*Insert the wooden end of a cotton swab through the opening of the electrode to push hair aside (in one direction) until the skin is clearly visible.
	*If the hair is long, lift up the electrode a little and let it down again while moving back the swab to grab a new bunch of hair (this will prevent the hair from slipping back).		*If the hair is long, lift up the electrode a little and let it down again while moving back the swab to grab a new bunch of hair (this will prevent the hair from slipping back).
	*Dip the swab into the Nuprep ~~(or other skin prep)~~ and insert through the electrode opening.		*Dip the swab into the Nuprep and insert through the electrode opening.
	*Twirl the swab against the skin using the thumb and index finger.		*Twirl the swab against the skin using the thumb and index finger.

Amnamyst: /* Reducing Skin Impedances */

2022-01-21T01:55:33Z

Reducing Skin Impedances

← Older revision		Revision as of 21:55, 20 January 2022
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	==Reducing Skin Impedances==		==Reducing Skin Impedances==
			[[File: NUPREP_Picture.jpg\|frameless\|left\| Nuprep]]
	<gallery mode="packed">
		⚫	[[File: Lemon_Prep_Picture_cropped.jpg\|frameless\|left\|Lemon Prep]]
	NUPREP_Picture.jpg\|
⚫	Lemon_Prep_Picture_cropped.jpg \|
	Ten_20_Paste_Picture1.png.jpg
	</gallery>

	'''Nuprep or Lemon Prep can be used for reducing skin impedance. Both are topical abrasives used to clean the skin to remove any natural or applied oil, lotions and/or dead skin. Remove with water.'''		'''Nuprep or Lemon Prep can be used for reducing skin impedance. Both are topical abrasives used to clean the skin to remove any natural or applied oil, lotions and/or dead skin. Remove with water.'''
	*Insert the wooden end of a cotton swab through the opening of the electrode to push hair aside (in one direction) until the skin is clearly visible.		*Insert the wooden end of a cotton swab through the opening of the electrode to push hair aside (in one direction) until the skin is clearly visible.

Amnamyst at 01:07, 21 January 2022

2022-01-21T01:07:13Z

← Older revision		Revision as of 21:07, 20 January 2022
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	==Reducing Skin Impedances==		==Reducing Skin Impedances==
			<gallery mode="packed">
⚫	[[File: ~~NUPREP_Picture~~.jpg\|frameless\|right\| ~~Nuprep~~]]
			NUPREP_Picture.jpg\|
	~~[[File:~~ Lemon_Prep_Picture_cropped.jpg\|~~frameless\|right\| Lemon Prep]]~~		Lemon_Prep_Picture_cropped.jpg \|
			Ten_20_Paste_Picture1.png.jpg
		⚫	</gallery>

	'''Nuprep or Lemon Prep can be used for reducing skin impedance. Both are topical abrasives used to clean the skin to remove any natural or applied oil, lotions and/or dead skin. Remove with water.'''		'''Nuprep or Lemon Prep can be used for reducing skin impedance. Both are topical abrasives used to clean the skin to remove any natural or applied oil, lotions and/or dead skin. Remove with water.'''
	*Insert the wooden end of a cotton swab through the opening of the electrode to push hair aside (in one direction) until the skin is clearly visible.		*Insert the wooden end of a cotton swab through the opening of the electrode to push hair aside (in one direction) until the skin is clearly visible.
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	==Applying Electrolyte==		==Applying Electrolyte==


	[[File: Ten_20_Paste_Picture1.png.jpg\|frameless\|right\|Ten/20 Conductive Paste]]		[[File: Ten_20_Paste_Picture1.png.jpg\|frameless\|right\|Ten/20 Conductive Paste]]
	'''Ten/20 Conductive Cream are opaque white, water soluble electrolytes substances used as a conductive and/or fixing/adhering mediums to attach electrodes. Removed with warm water.'''		'''Ten/20 Conductive Cream are opaque white, water soluble electrolytes substances used as a conductive and/or fixing/adhering mediums to attach electrodes. Removed with warm water.'''
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	==MEG DSQ 3500 Amplifier Setup==		==MEG DSQ 3500 Amplifier Setup==
		⚫	[[File: MEG DSQ 3500 Amplifier.jpg\|frameless\|right\| MEG DSG 3500 Amplifier]]

	'''Located inside the MSR on the table near the MEG machine. The DSQ 3500 Amplifier has inputs for:'''		'''Located inside the MSR on the table near the MEG machine. The DSQ 3500 Amplifier has inputs for:'''
	::::{\| class="wikitable"
	\|-
	\| <gallery>
	MEG DSQ 3500 Amplifier.jpg
⚫	</gallery>
	\|}


	::*'''Fiducial Coils''' - Nasion, Left Ear, Right Ear, Inion(unused) and Vertex(unused);		::*'''Fiducial Coils''' - Nasion, Left Ear, Right Ear, Inion(unused) and Vertex(unused);

Amnamyst at 00:55, 21 January 2022

2022-01-21T00:55:08Z

← Older revision		Revision as of 20:55, 20 January 2022
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	==Applying Electrolyte==		==Applying Electrolyte==
		⚫	[[File: Ten_20_Paste_Picture1.png.jpg\|frameless\|right\|Ten/20 Conductive Paste]]
	'''Ten/20 Conductive Cream are opaque white, water soluble electrolytes substances used as a conductive and/or fixing/adhering mediums to attach electrodes. Removed with warm water.'''		'''Ten/20 Conductive Cream are opaque white, water soluble electrolytes substances used as a conductive and/or fixing/adhering mediums to attach electrodes. Removed with warm water.'''

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	::'''*Completely fill the electrode space (the space from the skin to the electrode) with cream / paste so that there are no air pockets and the electrolyte makes good contact with the skin.		::'''*Completely fill the electrode space (the space from the skin to the electrode) with cream / paste so that there are no air pockets and the electrolyte makes good contact with the skin.

		⚫	''If the electrodes are closely spaced, be careful to avoid electrical bridging. This happens when electrolyte from adjacent electrodes pools together. To avoid this, draw back the syringe concurrently to prevent electrolyte from swelling underneath the electrode rim and bridging to the adjacent electrodes. When using Ten/20 do not allow the paste from adjacent electrodes to touch''

	::::{\| class="wikitable"
	\|-
	\| <gallery>
⚫	Ten_20_Paste_Picture1.png.jpg\|Ten/20 Conductive Paste
	</gallery>
	\|}

⚫	''If the electrodes are closely spaced, ~~when~~ ~~using~~ ~~Elifix~~ or ~~Abralyt,~~ in ~~order~~ to ~~prevent~~ ~~"electrode~~ ~~bridging"~~ draw back the syringe concurrently to prevent electrolyte from swelling underneath the electrode rim and bridging to the adjacent electrodes. When using Ten/20 do not allow the paste from adjacent electrodes to touch''



	<br>		<br>
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	::4. Press the Red ON Button to activate the impedance check. The power will automatically shutoff after approximately 2 minutes. (There is no OFF button.)		::4. Press the Red ON Button to activate the impedance check. The power will automatically shutoff after approximately 2 minutes. (There is no OFF button.)

	::5. If the impedance is too high - take a cotton tip swab dipped in Nuprep (~~Abralyt~~ or other skin prep) and twirl against the skin until impedance is at an appropriate level. Then re-insert Elifix electrolyte.		::5. If the impedance is too high - take a cotton tip swab dipped in Nuprep (or other skin prep) and twirl against the skin until impedance is at an appropriate level. Then re-insert Elifix electrolyte.