[Eeglablist] Channel locations lost after re-referencing

Sat Mar 3 19:01:23 PST 2018

I'm going to pick this thread back up, as I believe that the source of the issue with losing channel locations is pop_reref(), rather than the function I referred to below.

Channel locations are displayed as "Yes" when I add channel location info using pop_chanedit().  However, when I re-reference to the average signal using the line of code below, channel locations changes to No (labels only).

EEG = pop_reref(EEG, []);

I've tried moving pop_chanedit() to after pop_reref(), but this doesn't seem to solve the problem.  The channel location file I'm using is GSN-HydroCel-128.sfp, and I'm running EEGLab v. 14.1.1.

________________________________
From: lmm226
Sent: Saturday, March 3, 2018 12:55:44 AM
To: Ramón Martinez
Cc: eeglablist at sccn.ucsd.edu
Subject: Re: [Eeglablist] Channel locations lost after re-referencing

Thanks for the clarification--I'll be sure to do that.  I sometimes get confused about which functions belong to which package!

________________________________
From: Ramón Martinez <nucleuscub at gmail.com>
Sent: Friday, March 2, 2018 5:21:27 PM
To: lmm226
Cc: eeglablist at sccn.ucsd.edu
Subject: Re: [Eeglablist] Channel locations lost after re-referencing

Dear Laura,
pop_eegchanoperator is not an EEGLAB function. This function belongs to ERPLAB, which we do not develop at the SCCN. You may want to ask directly to ERPLAB developers regarding this problem.
 Hope this helps,
Ramon

On Thu, Mar 1, 2018 at 2:54 PM, lmm226 <laura.morett at yale.edu<mailto:laura.morett at yale.edu>> wrote:

As the title of this message suggests, for some reason, the channel locations for some subjects are lost when I re-reference.  This is not the case for all subjects, and I'm unsure of what differentiates subjects for whom channels are lost during re-referencing from subjects for whom they aren't. I checked the channels being used for the re-referencing as well as new channels created during these steps, but they all look fine to me.  Below is the code I'm using to re-reference:

        EEG = pop_eegchanoperator( EEG, [home_path 'chan_averaging_combined.txt'], 'ErrorMsg', 'popup', 'Warning', 'off' );

        EEG.setname = [EEG.setname '_reref'];

        if (save_files)

            EEG = pop_saveset(EEG, 'filename', [EEG.setname '.set'], 'filepath', data_path);

        end

Below are the contents of chan_averaging_combined.txt.  Any suggestions as to what may be causing this problem and how to fix it would be greatly appreciated.  TIA!

nch1 = ch1 - ( (ch57+ch101)/2 ) Label E1
nch2 = ch2 - ( (ch57+ch101)/2 ) Label E2
nch3 = ch3 - ( (ch57+ch101)/2 ) Label E3
nch4 = ch4 - ( (ch57+ch101)/2 ) Label E4
nch5 = ch5 - ( (ch57+ch101)/2 ) Label E5
nch6 = ch6 - ( (ch57+ch101)/2 ) Label E6
nch7 = ch7 - ( (ch57+ch101)/2 ) Label E7
nch8 = ch8 - ( (ch57+ch101)/2 ) Label E8
nch9 = ch9 - ( (ch57+ch101)/2 ) Label E9
nch10 = ch10 - ( (ch57+ch101)/2 ) Label E10
nch11 = ch11 - ( (ch57+ch101)/2 ) Label E11
nch12 = ch12 - ( (ch57+ch101)/2 ) Label E12
nch13 = ch13 - ( (ch57+ch101)/2 ) Label E13
nch14 = ch14 - ( (ch57+ch101)/2 ) Label E14
nch15 = ch15 - ( (ch57+ch101)/2 ) Label E15
nch16 = ch16 - ( (ch57+ch101)/2 ) Label E16
nch17 = ch17 - ( (ch57+ch101)/2 ) Label E17
nch18 = ch18 - ( (ch57+ch101)/2 ) Label E18
nch19 = ch19 - ( (ch57+ch101)/2 ) Label E19
nch20 = ch20 - ( (ch57+ch101)/2 ) Label E20
nch21 = ch21 - ( (ch57+ch101)/2 ) Label E21
nch22 = ch22 - ( (ch57+ch101)/2 ) Label E22
nch23 = ch23 - ( (ch57+ch101)/2 ) Label E23
nch24 = ch24 - ( (ch57+ch101)/2 ) Label E24
nch25 = ch25 - ( (ch57+ch101)/2 ) Label E25
nch26 = ch26 - ( (ch57+ch101)/2 ) Label E26
nch27 = ch27 - ( (ch57+ch101)/2 ) Label E27
nch28 = ch28 - ( (ch57+ch101)/2 ) Label E28
nch29 = ch29 - ( (ch57+ch101)/2 ) Label E29
nch30 = ch30 - ( (ch57+ch101)/2 ) Label E30
nch31 = ch31 - ( (ch57+ch101)/2 ) Label E31
nch32 = ch32 - ( (ch57+ch101)/2 ) Label E32
nch33 = ch33 - ( (ch57+ch101)/2 ) Label E33
nch34 = ch34 - ( (ch57+ch101)/2 ) Label E34
nch35 = ch35 - ( (ch57+ch101)/2 ) Label E35
nch36 = ch36 - ( (ch57+ch101)/2 ) Label E36
nch37 = ch37 - ( (ch57+ch101)/2 ) Label E37
nch38 = ch38 - ( (ch57+ch101)/2 ) Label E38
nch39 = ch39 - ( (ch57+ch101)/2 ) Label E39
nch40 = ch40 - ( (ch57+ch101)/2 ) Label E40
nch41 = ch41 - ( (ch57+ch101)/2 ) Label E41
nch42 = ch42 - ( (ch57+ch101)/2 ) Label E42
nch43 = ch43 - ( (ch57+ch101)/2 ) Label E43
nch44 = ch44 - ( (ch57+ch101)/2 ) Label E44
nch45 = ch45 - ( (ch57+ch101)/2 ) Label E45
nch46 = ch46 - ( (ch57+ch101)/2 ) Label E46
nch47 = ch47 - ( (ch57+ch101)/2 ) Label E47
nch48 = ch48 - ( (ch57+ch101)/2 ) Label E48
nch49 = ch49 - ( (ch57+ch101)/2 ) Label E49
nch50 = ch50 - ( (ch57+ch101)/2 ) Label E50
nch51 = ch51 - ( (ch57+ch101)/2 ) Label E51
nch52 = ch52 - ( (ch57+ch101)/2 ) Label E52
nch53 = ch53 - ( (ch57+ch101)/2 ) Label E53
nch54 = ch54 - ( (ch57+ch101)/2 ) Label E54
nch55 = ch55 - ( (ch57+ch101)/2 ) Label E55
nch56 = ch56 - ( (ch57+ch101)/2 ) Label E56
nch57 = ch57 Label E57
nch58 = ch58 - ( (ch57+ch101)/2 ) Label E58
nch59 = ch59 - ( (ch57+ch101)/2 ) Label E59
nch60 = ch60 - ( (ch57+ch101)/2 ) Label E60
nch61 = ch61 - ( (ch57+ch101)/2 ) Label E61
nch62 = ch62 - ( (ch57+ch101)/2 ) Label E62
nch63 = ch63 - ( (ch57+ch101)/2 ) Label E63
nch64 = ch64 - ( (ch57+ch101)/2 ) Label E64
nch65 = ch65 - ( (ch57+ch101)/2 ) Label E65
nch66 = ch66 - ( (ch57+ch101)/2 ) Label E66
nch67 = ch67 - ( (ch57+ch101)/2 ) Label E67
nch68 = ch68 - ( (ch57+ch101)/2 ) Label E68
nch69 = ch69 - ( (ch57+ch101)/2 ) Label E69
nch70 = ch70 - ( (ch57+ch101)/2 ) Label E70
nch71 = ch71 - ( (ch57+ch101)/2 ) Label E71
nch72 = ch72 - ( (ch57+ch101)/2 ) Label E72
nch73 = ch73 - ( (ch57+ch101)/2 ) Label E73
nch74 = ch74 - ( (ch57+ch101)/2 ) Label E74
nch75 = ch75 - ( (ch57+ch101)/2 ) Label E75
nch76 = ch76 - ( (ch57+ch101)/2 ) Label E76
nch77 = ch77 - ( (ch57+ch101)/2 ) Label E77
nch78 = ch78 - ( (ch57+ch101)/2 ) Label E78
nch79 = ch79 - ( (ch57+ch101)/2 ) Label E79
nch80 = ch80 - ( (ch57+ch101)/2 ) Label E80
nch81 = ch81 - ( (ch57+ch101)/2 ) Label E81
nch82 = ch82 - ( (ch57+ch101)/2 ) Label E82
nch83 = ch83 - ( (ch57+ch101)/2 ) Label E83
nch84 = ch84 - ( (ch57+ch101)/2 ) Label E84
nch85 = ch85 - ( (ch57+ch101)/2 ) Label E85
nch86 = ch86 - ( (ch57+ch101)/2 ) Label E86
nch87 = ch87 - ( (ch57+ch101)/2 ) Label E87
nch88 = ch88 - ( (ch57+ch101)/2 ) Label E88
nch89 = ch89 - ( (ch57+ch101)/2 ) Label E89
nch90 = ch90 - ( (ch57+ch101)/2 ) Label E90
nch91 = ch91 - ( (ch57+ch101)/2 ) Label E91
nch92 = ch92 - ( (ch57+ch101)/2 ) Label E92
nch93 = ch93 - ( (ch57+ch101)/2 ) Label E93
nch94 = ch94 - ( (ch57+ch101)/2 ) Label E94
nch95 = ch95 - ( (ch57+ch101)/2 ) Label E95
nch96 = ch96 - ( (ch57+ch101)/2 ) Label E96
nch97 = ch97 - ( (ch57+ch101)/2 ) Label E97
nch98 = ch98 - ( (ch57+ch101)/2 ) Label E98
nch99 = ch99 - ( (ch57+ch101)/2 ) Label E99
nch100 = ch100 - ( (ch57+ch101)/2 ) Label E100
nch101 = ch101 Label E101
nch102 = ch102 - ( (ch57+ch101)/2 ) Label E102
nch103 = ch103 - ( (ch57+ch101)/2 ) Label E103
nch104 = ch104 - ( (ch57+ch101)/2 ) Label E104
nch105 = ch105 - ( (ch57+ch101)/2 ) Label E105
nch106 = ch106 - ( (ch57+ch101)/2 ) Label E106
nch107 = ch107 - ( (ch57+ch101)/2 ) Label E107
nch108 = ch108 - ( (ch57+ch101)/2 ) Label E108
nch109 = ch109 - ( (ch57+ch101)/2 ) Label E109
nch110 = ch110 - ( (ch57+ch101)/2 ) Label E110
nch111 = ch111 - ( (ch57+ch101)/2 ) Label E111
nch112 = ch112 - ( (ch57+ch101)/2 ) Label E112
nch113 = ch113 - ( (ch57+ch101)/2 ) Label E113
nch114 = ch114 - ( (ch57+ch101)/2 ) Label E114
nch115 = ch115 - ( (ch57+ch101)/2 ) Label E115
nch116 = ch116 - ( (ch57+ch101)/2 ) Label E116
nch117 = ch117 - ( (ch57+ch101)/2 ) Label E117
nch118 = ch118 - ( (ch57+ch101)/2 ) Label E118
nch119 = ch119 - ( (ch57+ch101)/2 ) Label E119
nch120 = ch120 - ( (ch57+ch101)/2 ) Label E120
nch121 = ch121 - ( (ch57+ch101)/2 ) Label E121
nch122 = ch122 - ( (ch57+ch101)/2 ) Label E122
nch123 = ch123 - ( (ch57+ch101)/2 ) Label E123
nch124 = ch124 - ( (ch57+ch101)/2 ) Label E124
nch125 = ch125 - ( (ch57+ch101)/2 ) Label E125
nch126 = ch126 - ( (ch57+ch101)/2 ) Label E126
nch127 = ch127 - ( (ch57+ch101)/2 ) Label E127
nch128 = ch128 - ( (ch57+ch101)/2 ) Label E128
nch129 = ch128 - ch17 Label HEOG-R
nch130 = ch17 - ch125 Label HEOG-L
nch131 = ch127 + ch126 - (((ch21+ch25)/2) + ((ch14+ch8)/2)) Label biVEOG

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--
_____________________________________________________
Ramon Martinez-Cancino
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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