Channel Definition File Formats - Revision history

Jaehyun at 13:20, 5 May 2021

2021-05-05T13:20:57Z

Jaehyun at 15:27, 19 February 2018

2018-02-19T15:27:51Z

Jaehyun at 15:23, 19 February 2018

2018-02-19T15:23:38Z

Jaehyun at 08:12, 16 June 2017

2017-06-16T08:12:52Z

Robert at 14:06, 15 February 2017

2017-02-15T14:06:26Z

Harald at 15:02, 8 April 2016

2016-04-08T15:02:51Z

Robert: Initial creation of article

2016-04-08T14:34:37Z

Initial creation of article

New page

BESA Research can read 3 types of file to define channels. These are identified by different extensions:
• channel definition files containing labels and, optionally, channel types (ASCII, 1 label /line): *.ela
• channel definition files containing coordinates and, optionally, channel types and labels (ASCII): *.elp. This is the format of the file written by the ''Channel Configuration Dialog''.
• channel definition files stored by older versions of BESA Research (binary format): *.elb. This format can still be read, but is no longer written by BESA Research

=== Channel Label File Format ===
Files containing a list of channel labels are an alternative to editing electrode configurations in the application. These files can be edited using a standard text editor. Electrode label files (.ela) require a sequence of lines corresponding to the sequence of channels in the data. Each line contains one label and an optional identifier. The format is '[Identifier] {Label}', ('Identifier' can be omitted if the electrode label defines the type of signal)

'''Identifiers can be one of:'''
* EEG - scalp electrode
* SCP - scalp electrode
* POL - polygraphic channel
* PGR - polygraphic channel
* ICR - intracranial electrode
* MEG - MEG sensor
* REF - reference electrode (this can only occur once, and must be the last item in the file)

'''Examples:'''
* Fz (scalp electrode, coordinates assigned by default.ecd)
* Cz (scalp electrode, coordinates assigned by default.ecd)
* VEOG (vertical EOG, Polygraphic type is assigned by default)
* Exx (xx=01, 02.. electrode number, Polygraphic type is assigned by default)
* EEG xx (scalp electrode, coordinates must be assigned either by default.ecd or by a surface point (+.sfp) file. An alternative to the "EEG" prefix is "SCP".
* POL XX (identifier sets Polygraphic type -- an alternative to the "POL" prefix is "PGR")
* ICR A01 (identifier sets Intracranial type to electrode A01 - do not use A1!)
* ICR A02 (identifier sets Intracranial type to electrode A02 - do not use A2!)
* ICR A03 (identifier sets Intracranial type to electrode A03)
* MEG M01 (identifier sets MEG type to electrode M01 - do not use M1!)
* MEG M02 (identifier sets MEG type to electrode M02 - do not use M2!)
* REF Cz (the label is assigned to the electrode reference, no channel is associated with this entry. This must be the last line of the file!)

=== Channel Spherical Coordinate File Format ===
These files follow the same rules as the channel label files, with the addition of spherical coordinates (theta, phi) that follow the labels of EEG and MEG channels. Labels can also be omitted. In this case, BESA Research will assign labels according to the nearest coordinate defined in the ''default.ecd'' file. To indicate that the coordinates have been assigned, the label will have a tick, e.g. Fz' instead of Fz.
Channels of other types (polygraphic, intracranial) are defined exactly as in the channel label (*.ela) file.

@@ Line 2: / Line 2: @@
 |title = Module information
 |module = BESA Research Basic or higher
-|version = 5.2 or higher
+|version = BESA Research 5.2 or higher
 }}

@@ Line 8: / Line 8: @@
 * <span style="color:#ff9c00;">*.ela</span>: Channel definition files containing labels and, optionally, channel types (ASCII, 1 label/line).
-* <span style="color:#ff9c00;">*.elp</span>: Channel definition files containing coordinates and, optionally, channel types and labels (ASCII). This is the format of the file written by the ''Channel Configuration Dialog''.
+* <span style="color:#ff9c00;">*.elp</span>: Channel definition files containing coordinates and, optionally, channel types and labels (ASCII). This is the format of the file written by the [[Electrodes_and_Surface_Locations#Editing_the_channel_configuration | Channel Configuration Dialog]].
 * <span style="color:#ff9c00;">*.elb</span>: Channel definition files stored by older versions of BESA Research (binary format). This format can still be read, but is no longer written by BESA Research.
@@ Line 48: / Line 48: @@
 | Exx || xx=01, 02.. electrode number, '''Polygraphic''' type is assigned by default
 |-
-| EEG xx || '''scalp''' electrode, coordinates must be assigned either by '''default.ecd''' or by '''a surface point file (*.sfp)'''. An alternative to the "EEG" prefix is "SCP".
+| EEG xx || '''scalp''' electrode, coordinates must be assigned either by '''default.ecd''' or by [[Working_With_Additional_Files#sfp_.28surface_point_coordinate.29_file | '''a surface point file (*.sfp)''']]. An alternative to the "EEG" prefix is "SCP".
 |-
 | POL XX || identifier sets '''Polygraphic''' type - an alternative to the "POL" prefix is "PGR"

← Older revision		Revision as of 14:06, 15 February 2017
Line 40:		Line 40:
	Channels of other types (polygraphic, intracranial) are defined exactly as in the channel label (*.ela) file.		Channels of other types (polygraphic, intracranial) are defined exactly as in the channel label (*.ela) file.

−	[[Category:Preprocessing]]	+	[[Category:Preprocessing]] [[Category:Data Import/Export]]

@@ Line 6: / Line 6: @@
 BESA Research can read 3 types of file to define channels. These are identified by different extensions:
-=== Channel Label File Format ===
+* <span style="color:#ff9c00;">*.ela</span>: Channel definition files containing labels and, optionally, channel types (ASCII, 1 label/line).
-Files containing a list of channel labels are an alternative to editing electrode configurations in the application. These files can be edited using a standard text editor. Electrode label files (.ela) require a sequence of lines corresponding to the sequence of channels in the data. Each line contains one label and an optional identifier. The format is '[Identifier] {Label}', ('Identifier' can be omitted if the electrode label defines the type of signal)
+=== Channel Label File Format (<span style="color:#ff9c00;">*.ela</span>) ===
 '''Identifiers can be one of:'''
-* EEG - scalp electrode
-* SCP - scalp electrode
+{|
-* POL - polygraphic channel
+|-
-* PGR - polygraphic channel
+| width="100pt" | EEG || scalp electrode
-* ICR - intracranial electrode
+|-
-* MEG - MEG sensor
+| SCP || scalp electrode
-* REF - reference electrode (this can only occur once, and must be the last item in the file)
+|-
 '''Examples:'''
-=== Channel Spherical Coordinate File Format ===
+{|
-These files follow the same rules as the channel label files, with the addition of spherical coordinates (theta, phi) that follow the labels of EEG and MEG channels. Labels can also be omitted. In this case, BESA Research will assign labels according to the nearest coordinate defined in the <span style="color:#ff9c00;">default.ecd</span> file. To indicate that the coordinates have been assigned, the label will have a tick, e.g. '''<span style="color:#3366ff;">Fz'</span>''' instead of <span style="color:#3366ff;">Fz</span>.
+Channels of other types (polygraphic; intracranial) are defined exactly as in the channel label (*.ela) file.
-Channels of other types (polygraphic, intracranial) are defined exactly as in the channel label (*.ela) file.
 [[Category:Preprocessing]] [[Category:Data Import/Export]]

@@ Line 6: / Line 6: @@
 BESA Research can read 3 types of file to define channels. These are identified by different extensions:
-• channel definition files containing labels and, optionally, channel types (ASCII, 1 label /line): *.ela
+* channel definition files containing labels and, optionally, channel types (ASCII, 1 label /line): <span style="color:#ff9c00;">*.ela</span>
-• channel definition files containing coordinates and, optionally, channel types and labels (ASCII): *.elp. This is the format of the file written by the ''Channel Configuration Dialog''.
+* channel definition files containing coordinates and, optionally, channel types and labels (ASCII): <span style="color:#ff9c00;">*.elp</span>. This is the format of the file written by the ''Channel Configuration Dialog''.
-• channel definition files stored by older versions of BESA Research (binary format): *.elb. This format can still be read, but is no longer written by BESA Research
+* channel definition files stored by older versions of BESA Research (binary format): <span style="color:#ff9c00;">*.elb</span>. This format can still be read, but is no longer written by BESA Research
 === Channel Label File Format ===
 Files containing a list of channel labels are an alternative to editing electrode configurations in the application. These files can be edited using a standard text editor. Electrode label files (.ela) require a sequence of lines corresponding to the sequence of channels in the data. Each line contains one label and an optional identifier. The format is '[Identifier] {Label}', ('Identifier' can be omitted if the electrode label defines the type of signal)
@@ Line 37: / Line 38: @@
 === Channel Spherical Coordinate File Format ===
-These files follow the same rules as the channel label files, with the addition of spherical coordinates (theta, phi) that follow the labels of EEG and MEG channels. Labels can also be omitted. In this case, BESA Research will assign labels according to the nearest coordinate defined in the ''default.ecd'' file. To indicate that the coordinates have been assigned, the label will have a tick, e.g. Fz' instead of Fz.
 Channels of other types (polygraphic, intracranial) are defined exactly as in the channel label (*.ela) file.
 [[Category:Preprocessing]] [[Category:Data Import/Export]]