Use different timelines depending on trial condition

[SRJongman]

Hi,

I have an experiment where a sentence can end either in a word or a picture. To present the word and picture I use different plugins as they require different responses (word: one button press to end trials, picture: type answer until trial duration runs out), so they have different timelines. These types of trials are randomized. I have added task: word/pic to the variable information. How can I add an if-statements that says if task = word then run word timeline, else run picture timeline. I have played with the conditional timelines and I see how that works based on a given response using jsPsych.data.get() to get the last response, but not how to use this at the start of a trial.

Kind regards,

Suzanne

[jodeleeuw]

Hi Suzanne,

If I'm understanding correctly you've got a timeline variable that specifies word or pic. You can access timeline variables in the conditional_function of a timeline. So something like this should work:

var word_timeline = {
	timeline: [word_trial],
	conditional_function: function(){
		if(jsPsych.timelineVariable('word_or_pic', true) == 'word') {
			return true;
		} else {
			return false;
		}
	}
}

var pic_timeline = {
	timeline: [pic_trial],
	conditional_function: function(){
		if(jsPsych.timelineVariable('word_or_pic', true) == 'pic') {
			return true;
		} else {
			return false;
		}
	}
}

var word_or_pic = {
	timeline: [word_timeline, pic_timeline],
	timeline_variables: [
		{word_or_pic: 'word'},
		{word_or_pic: 'pic'}
	]
}

[SRJongman]

Hi Josh,

Thanks for your help! I got it to work as follows:

var word_timeline = {
	timeline: [word_trial],
	conditional_function: function(){
		if(jsPsych.timelineVariable('word_or_pic', true) == 'word') {
			return true;
		} else {
			return false;
		}
	}
}
var pic_timeline = {
	timeline: [pic_trial],
	conditional_function: function(){
		if(jsPsych.timelineVariable('word_or_pic', true) == 'pic') {
			return true;
		} else {
			return false;
		}
	}
}
var word_or_pic = {
    timeline: [word_timeline, pic_timeline],
    timeline_variables: stimuli
}