Easycap-M43 montage (#11744)

Co-authored-by: Stefan Appelhoff <[email protected]>

doc/changes/latest.inc

@@ -25,6 +25,7 @@ Enhancements
 ~~~~~~~~~~~~
 - Add ``cmap`` argument for the :func:`mne.viz.plot_sensors` (:gh:`11720` by :newcontrib:`Gennadiy Belonosov`)
 - When failing to locate a file, we now print the full path in quotation marks to help spot accidentally added trailing spaces (:gh:`11718` by `Richard Höchenberger`_)
+- Add standard montage lookup table for ``easycap-M43`` (:gh:`11744` by :newcontrib:`Diptyajit Das`)
 - Added :class:`mne.preprocessing.eyetracking.Calibration` to store eye-tracking calibration info, and :func:`mne.preprocessing.eyetracking.read_eyelink_calibration` to read calibration data from EyeLink systems (:gh:`11719` by `Scott Huberty`_)
 
 Bugs

doc/changes/names.inc

@@ -120,6 +120,8 @@
 
 .. _Dinara Issagaliyeva: https://github.com/dissagaliyeva
 
+.. _Diptyajit Das: https://github.com/dasdiptyajit
+
 .. _Dirk Gütlin: https://github.com/DiGyt
 
 .. _Dmitrii Altukhov: https://github.com/dmalt

mne/channels/_standard_montage_utils.py

@@ -124,6 +124,7 @@ def _mgh_or_standard(basename, head_size, coord_frame="unknown"):
     "EGI_256": _egi_256,
     "easycap-M1": partial(_easycap, basename="easycap-M1.txt"),
     "easycap-M10": partial(_easycap, basename="easycap-M10.txt"),
+    "easycap-M43": partial(_easycap, basename="easycap-M43.txt"),
     "GSN-HydroCel-128": partial(_hydrocel, basename="GSN-HydroCel-128.sfp"),
     "GSN-HydroCel-129": partial(_hydrocel, basename="GSN-HydroCel-129.sfp"),
     "GSN-HydroCel-256": partial(_hydrocel, basename="GSN-HydroCel-256.sfp"),

mne/channels/data/montages/easycap-M43.txt

@@ -0,0 +1,65 @@
+Site	Theta	 Phi
+1	      23  	  90
+2 	      23 	  30
+3 	      23 	 -30
+4 	      23 	 -90
+5 	     -23	  30
+6 	     -23	 -30
+7 	      46	  74
+8 	      46	  41
+9 	      46	   8
+10 	      46	 -25
+11 	      46	 -57
+12 	      46	 -90
+13 	     -46	  57
+14 	     -46	  25
+15 	     -46	 -8
+16 	     -46	 -41
+17 	     -46	 -74
+18 	      69	  76
+19 	      69	  49
+20 	      69	  21
+21 	      69	 -7
+22 	      69	 -35
+23 	      69	 -62
+24 	      69	 -90
+25 	     -69	  62
+26 	     -69	  35
+27 	     -69	   7
+28 	     -69	 -21
+29 	     -69	 -49
+30 	     -69	 -76
+31 	      92	  90
+32 	      92	  62
+33 	      92	  34
+34 	      92 	   6
+35 	      92 	 -21
+36 	      92 	 -49
+37 	      92 	 -76
+38 	     -92 	  76
+39 	     -92 	  49
+40 	     -92 	  21
+41 	     -92 	 -6
+42 	     -92 	 -34
+43 	     -92 	 -62
+44 	     115 	  35
+45 	     115 	  10
+46 	     115 	 -15
+47 	     115 	 -40
+48 	     115 	 -65
+49 	     115 	 -90
+50 	    -115	  65
+51 	    -115 	  40
+52 	    -115 	  15
+53 	    -115 	 -10
+54 	    -115 	 -35
+55 	     138 	  23
+56 	     138 	 -15
+57 	     138 	 -40
+58 	     138 	 -65
+59 	     138 	 -90
+60 	    -138 	  65
+61 	    -138 	  40
+62 	    -138 	  15
+63 	    -138 	 -23
+Ref	      0 	   0

mne/channels/montage.py

@@ -139,6 +139,10 @@ class _BuiltinStandardMontage:
         name="easycap-M10",
         description="EasyCap with numbered electrodes (61 locations)",
     ),
+    _BuiltinStandardMontage(
+        name="easycap-M43",
+        description="EasyCap with numbered electrodes (64 locations)",
+    ),
     _BuiltinStandardMontage(
         name="EGI_256",
         description="Geodesic Sensor Net (256 locations)",

mne/channels/tests/test_montage.py

@@ -1915,7 +1915,7 @@ def test_read_dig_hpts():
 
 def test_get_builtin_montages():
     """Test help function to obtain builtin montages."""
-    EXPECTED_COUNT = 27
+    EXPECTED_COUNT = 28
 
     montages = get_builtin_montages()
     assert len(montages) == EXPECTED_COUNT