An easy-to-use platform for EEG experimentation in the classroom
experimenting with lsl
Co-authored-by: Yury Shevchenko <shevchenko_yury@mail.ru>
authored by
Yury Shevchenko
Yury Shevchenko
and committed by
Teon L Brooks
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app/package.json
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app/package.json
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app/utils/jspsych/functions.js
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app/utils/jspsych/functions.js
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import { jsPsych } from 'jspsych-react';
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import * as path from 'path';
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import { readdirSync } from 'fs';
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import lsl from 'node-lsl';
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import { EXPERIMENTS } from '../../constants/constants';
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import { buildOddballTimeline } from './timelines/oddball';
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import { buildN170Timeline } from './timelines/n170';
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Trial,
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ExperimentParameters
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} from '../../constants/interfaces';
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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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'Marker', // type
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1, // number of channels
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10, // sample rate in 1 sec.
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lsl.channel_format_t.cft_float32,
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'Dummy Marker Device'
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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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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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const outlet = lsl.create_outlet(info, 0, 360);
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// loads a normalized timeline for the default experiments with specific callback fns
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export const loadTimeline = (type: EXPERIMENTS) => {
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if (trial.id === 'trial') {
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return {
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...trial,
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on_start: () => {
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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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eventCallback(
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jsPsych.timelineVariable('eventTypeVar')(),
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new Date().getTime()