An easy-to-use platform for EEG experimentation in the classroom
streaming jsPsych marker with lsl
authored by
Yury Shevchenko
and committed by
Teon L Brooks
977a9c6b
7714c36a
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app/utils/jspsych/functions.js
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app/utils/jspsych/functions.js
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// create and open an outlet to stream data
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const info = lsl.create_streaminfo(
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'Dummy',
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'jsPsych',
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'Marker', // type
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1, // number of channels
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10, // sample rate in 1 sec.
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0, // irregular sample rate
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lsl.channel_format_t.cft_float32,
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'Dummy Marker Device'
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'jspsych_brainwaves' // source_id
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);
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const desc = lsl.get_desc(info);
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lsl.append_child_value(desc, 'manufacturer', 'Random Inc.');
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lsl.append_child_value(desc, 'manufacturer', 'BrainWaves');
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const channels = lsl.append_child(desc, 'channels');
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const channel = lsl.append_child(channels, 'channel');
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lsl.append_child_value(channel, 'type', 'Marker');
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if (trial.id === 'trial') {
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return {
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...trial,
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on_start: e => {
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if (e) {
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const correctResponse = parseFloat(e.correct_response);
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lsl.push_sample_ft(
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outlet,
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new lsl.FloatArray([correctResponse]),
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lsl.local_clock()
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);
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}
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on_start: () => {
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const eventType = jsPsych.timelineVariable('eventTypeVar')() || 0;
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lsl.push_sample_ft(
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outlet,
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new lsl.FloatArray([eventType]),
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lsl.local_clock()
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);
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eventCallback(
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jsPsych.timelineVariable('eventTypeVar')(),
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new Date().getTime()