OpenViBE forum
http://openvibe.inria.fr/forum/

using LSL to send both data and stimulus
http://openvibe.inria.fr/forum/viewtopic.php?f=6&t=9421
Page 1 of 1

Author:  HA3 [ Fri Feb 27, 2015 4:04 pm ]
Post subject:  using LSL to send both data and stimulus

I've try to send both data and stimulus on LSL export box in openViBE, but I can't understand how to recieve the stimulus, I have write a matlab code, which is shown below to recieve the data and the stimulus, but it's recieve the data and additional row, which is always has the value zero. for example if I have 4 channels I will receive (444 4445 4446 1478 0) where the first four values is the values of channels and the last one always has the value zero.

I expect the last value or the additional row is the stimulus value, but why it's always has the value zero! I have applied many stimulus by the keyboard stimulus but it's still give me zero ! could you help me to know how to recieve the stimulus?

Code:
disp(Loading the library...');
lib = lsl_loadlib();
disp('Resolving an EEG stream...');
result = {};

while isempty(result)
    result = lsl_resolve_byprop(lib,'type','EEG'); end

% create a new inlet
disp('Opening an inlet...');
inlet = lsl_inlet(result{1});

disp('Now receiving data...');
while true
    [vec] = inlet.pull_sample();
    disp('new data : ')
    fprintf('%.2f\t\n',vec);
    % Ex : vec  = [9987 4452 1147 7777 0]
end

Author:  jtlindgren [ Mon May 04, 2015 9:16 am ]
Post subject:  Re: using LSL to send both data and stimulus

Hello,

if I understand correctly, the LSL Export box you're talking about (in 1.0 its called 'LSL Export (Gipsa)') is supposed to append the stimuli as a number in the last column, with 0 meaning there is no stimulation at the time corresponding to that sample.

In 1.0, you can also try the other LSL Export box which encodes stimulations in a separate integer stream.


Happy hacking,
Jussi

Author:  jtlindgren [ Tue May 19, 2015 9:17 am ]
Post subject:  Re: using LSL to send both data and stimulus

Btw, I've posted a brief documentation about using LabStreamingLayer in OpenViBE 1.0.0 here,

http://openvibe.inria.fr/how-to-use-lab ... -openvibe/


Cheers,
Jussi

Author:  faturita [ Mon Jul 23, 2018 10:16 pm ]
Post subject:  Re: using LSL to send both data and stimulus

We have the same exact issue when the "Stimulator Input" for "LSL Export (Gipsa)" is connected to the "Stimulator Output" of the Acquisition Server.
The only way to fix it was to connect it to a different Stimulator output.

Page 1 of 1 All times are UTC
Powered by phpBB® Forum Software © phpBB Group
https://www.phpbb.com/