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Shaobin-Jiang avatar Shaobin-Jiang commented on June 2, 2024 1

Of course it is possible, but not with jsPsych's API. I think you would have to write your own keyboard listeners, like the example below:

let jsPsych = initJsPsych({
    on_finish: function () {
        jsPsych.data.displayData();
    },
});

let trial = {
    type: jsPsychHtmlKeyboardResponse,
    stimulus: 'Press F',
    choices: 'NO_KEYS',
    on_load: function () {
        let time_start = performance.now();
        let key_down, key_up;

        function keydown_listener(ev) {
            if (ev.key.toLowerCase() === 'f' && !ev.repeat) {
                key_down = performance.now() - time_start;
            }
        }

        function keyup_listener(ev) {
            if (ev.key.toLowerCase() === 'f' && typeof key_down !== 'undefined') {
                key_up = performance.now() - time_start;
                jsPsych.finishTrial({key_down, key_up});
                document.body.removeEventListener('keydown', keydown_listener);
                document.body.removeEventListener('keyup', keyup_listener);
            }
        }

        document.body.addEventListener('keydown', keydown_listener);

        document.body.addEventListener('keyup', keyup_listener);
    },
};

jsPsych.run([trial]);

from jspsych.

simonstentTRI avatar simonstentTRI commented on June 2, 2024

Ah I see, thanks a lot for your help @Shaobin-Jiang !

from jspsych.

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