Spot certain channels on a topography

Discussions
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1

Hello
I have a topography with 64 channels and I would like to mark only some of them with black dots on the topography.
Is this possible and if so how, please?

2

Hi @EmmanuelleKris, you can take advantage of the fact that selected channels are painted in red. Check this snippet:

% 1. Open the topography figure
% 2. Display the sensors (electrodes)
% 3. Select the desired electodes, these will become red
% 4. Change the color for those red electrodes
% Find patch object for sensors
hSensorsPatch = findobj(gcf, 'Tag', 'SensorsPatch');
% Change red [1, 0.3, 0] sensors to black [0, 0, 0]
VerticesColors = get(hSensorsPatch, 'FaceVertexCData');
iSelected = find(ismember(VerticesColors, [1, 0.3, 0], 'rows'));
VerticesColors(iSelected, :) =repmat([0, 0, 0], length(iSelected), 1);
% Set new colors
set(hSensorsPatch, 'FaceVertexCData', VerticesColors);

If you want to select the channels programatically, you can use:
bst_figures('SetSelectedRows', SensorNames);
with SensorNames being a cell array of the sensor names