Creating feedback per trial that present latency

[Snir Barzilay]

Hello everyone,

In the practice phase of my task I want to insert during a 1 ms blank screen a feedback that displays user's input latency after every trial. 

For example:

Correct!

870 ms response time. 

How could I do that? also could I save the relevant data in one interaction and use it in the next interaction? 

I want to insert the feedbank when 'blankcorrect' or 'blankerror' is triggered.

Best,

Snir

API.addTrialSets('base_local',[{

input: [

{handle:'left',on:'keypressed',key:'left'},

{handle:'right',on:'keypressed',key:'right'}

],

interactions: [

/* Display the cue stimulus. */

{

conditions:[{type:'begin'}],

actions: [

{type:'showStim',handle: 'fixation'},

{type:'removeInput',handle : ['left','right']},

{type:'setInput',input:{handle:'showMyStim', on:'timeout',duration:1000}}

]

},

{

conditions:[{type:'inputEquals',value:'showMyStim'}],

actions: [

{type:'resetTimer'},

{type:'hideStim',handle: 'fixation'},

{type:'showStim', handle: 'cue'},

{type:'setInput',input:{handle:'end',on:'timeout',duration:1500}},

{type:'setInput',input:{handle:'right',on: 'keypressed', key:['p','P']}},

{type:'setInput',input:{handle:'left',on: 'keypressed', key:['q','Q']}}

]

},

// ### Error feedback

// Lets add error feedback to our task.

// Above, we created the error stimulus. This creates a stimulus that displays a orange X at the bottom of the screen.

// Now that we have the error stimulus in place we can add the instruction how to display it.

// On incorrect responses we will display the error feedback, and trigger the end of the trial only after another 250 miliseconds.

/* Correct response actions */

{

conditions: [

{type:'inputEqualsStim',property:'correct_local'}

],

actions: [

{type:'setTrialAttr', setter:{score:1}},

{type:'setTrialAttr', setter:{message:'Correct response'}},

{type:'log'},

{type:'hideStim',handle:'cue'},

{type:'removeInput',handle:['left','right']},

{type:'removeInput',handle:'time'},

{type:'trigger', handle:'blankcorrect'}

]

},

/* Incorrect response actions */

{

conditions: [

{type:'inputEqualsStim',property:'correct_local',negate:true},

{type:'inputEquals',value:['left','right']}

],

actions: [

{type:'setTrialAttr', setter:{score:0}},

{type:'setTrialAttr', setter:{message:'Incorrect response'}},

{type:'log'},

{type:'removeInput',handle:['left','right']},

{type:'removeInput',handle:'time'},

{type:'hideStim',handle:'cue'},

{type:'trigger', handle:'blankerror'}

]

},

// . error feedback screen

{

conditions: [

{type:'inputEquals',value:'blankerror'},

{type:'trialEquals',property:'group',value:'practice_local'}

],

actions: [

{type:'showStim',handle:'error'},

{type:'trigger', handle:'end',on:'timeout',duration:1000}

]

},

// . correct feedback screen

{

conditions: [

{type:'inputEquals',value:'blankcorrect'},

{type:'trialEquals',property:'group',value:'practice_local'}

],

actions: [

{type:'showStim',handle:'correct'},

{type:'trigger', handle:'end',on:'timeout',duration:1000}

]

},

/* End trial */

{

conditions: [{type:'inputEquals', value:'end'}],

actions:[

{type:'hideStim',handle:'All'},

{type:'removeInput',handle:['left','right']},

{type:'endTrial'}

]

}

]

}]);

[Elad Zlotnick]

MinnoJS does not support live updates to templates, so you can do that manually.

In the stimulus create a place holder ({{latnecy}}).

{media: 'Correct!{{latency}} ms response time', handle:'correct'}

In the actions you can replace the place holder with the current latency:

(The data-handle attribute of the stimulus needs to be set according to the stimulus handle)

The requestAnimationFrame clause prevents us from losing a frame to a redraw here.

{type:'custom', fn:function(condition, inputData){

    var el = document.querySelector('[data-handle="correct"]');

    requestAnimationFrame(function(){

        el.innerHTML = el.innerHTML.replace('{{latency}}', Math.floor(inputData.latency));

    });

}}

And then simply show the stimulus:

{type:'showStim', handle:'correct'}

[Snir Barzilay]

Excellent! this worked perfectly!

thank you.

[Yoav Bar-Anan]

I have another question related to this topic: Is there a similar method to change a value passed to an action?

My action is:

{type:'trigger', handle:'Wait', duration:'<%=trialData.stimDur%>'}

However,  I change the stimDur within the trial. Is there any way to dynamically change the duration of the trigger after the trial starts?

Thanks,

Yoav

[Elad Zlotnick]

Hi Yoav,

Yes there is, though it is a bit more involved.

You can create a custom action by replacing the action by a function.

You can get an idea for how actions work by looking in this file: https://github.com/minnojs/minno-time/blob/0.5/src/app/trial/interactions/actionList.js

What you are trying to do, is to slightly change the trigger action.

I'd try swapping the whole action with the following function:

    function(action, eventData, trial){

        trial.input.add({handle:action.handle, on:'timeout', duration:+trial.data.stimDur});

    },

best of luck,

Elad

[Yoav Bar-Anan]

Thanks Elad,  It worked well. Specifically, this is the code I used for the action:

        {type:'custom',fn:function(action,eventData,trial){ //Using a custom function allows us to set the duration on the fly.
             trial.data.stimDur = trial.data.minDur+Math.round((Math.random()*current.randRange)); //Compute a wait duration specifically for this trial
             trial.input.add({handle:'Wait', on:'timeout', duration:trial.data.stimDur}); //We want to trigger the input 'Wait' after a duration of trial.data.stimDur ms
   }}

Note that 'Wait' is the handle for the input I want to be called after the timeout. 

Yoav

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