Task

// We've been slowly pulling the stroop task together, now is the time for a few last touches, just to get the feel for how things work. define(['pipAPI'], function(APIconstructor) { var API = new APIconstructor(); API.addSettings('canvas',{ textSize: 5 }); API.addStimulusSets('red',[ {media:'Red', css:{color:'red'}}, {media:'Blue', css:{color:'red'}}, {media:'Green', css:{color:'red'}} ]); API.addStimulusSets('blue',[ {media:'Red', css:{color:'blue'}}, {media:'Blue', css:{color:'blue'}}, {media:'Green', css:{color:'blue'}} ]); API.addStimulusSets('green',[ {media:'Red', css:{color:'green'}}, {media:'Blue', css:{color:'green'}}, {media:'Green', css:{color:'green'}} ]); API.addStimulusSets('error',[ {handle:'error',media:'X', css:{fontSize:'2em',color:'#FF0000'}, location:{top:70}} ]); API.addTrialSets('base',[{ input: [ {handle:'red',on:'keypressed',key:'1'}, {handle:'blue',on:'keypressed',key:'2'}, {handle:'green',on:'keypressed',key:'3'} ], layout: [ {media:'1',location:{left:2,top:2},css:{background:'red',padding:'2%',fontSize:'1.5em'}}, {media:'2',location:{top:2},css:{background:'blue',padding:'2%',fontSize:'1.5em'}}, {media:'3',location:{right:2,top:2},css:{background:'green',padding:'2%',fontSize:'1.5em'}} ], interactions: [ /* Display the target stimulus. */ { conditions:[{type:'begin'}], actions: [{type:'showStim', handle: 'target'}] }, // ### Error feedback // Lets add error feedback to our task. // Above, we created the error stimulus. This creates a stimulus that displays a red 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:'inputEqualsTrial',property:'group'} ], actions: [ {type:'setTrialAttr', setter:{score:1}}, {type:'log'}, {type:'trigger', handle:'ITI'} ] }, /* Incorrect response actions */ { conditions: [ {type:'inputEqualsTrial',property:'group',negate:true}, {type:'inputEquals',value:['red','blue','green']} ], actions: [ {type:'setTrialAttr', setter:{score:0}}, {type:'log'}, {type:'showStim', handle:'error'}, {type:'removeInput',handle:['red','blue','green']}, {type:'trigger', handle:'ITI', duration:500} ] }, // There are several changes done here to achieve this task. // First, all the end trial actions have move into an interaction of their own (see below), that is activated when `ITI` is triggered. // Second, the correct response now triggers the ITI immediately. // Third, The incorrect response first displays the error feedback (`showStim`) and only after 500 milliseconds triggers the ITI. // You should also note that the `hideStim` action within the ITI interaction uses the handle `'All'`. When you want to refer to all the stimuli in a trial you can use the handle `'All'` and all stimuli will be affected. // ### Inter trial interval // We add an inter trial interval (ITI). // The way we are going to do this is by adding a set interval to the end of each trial. // Instead of directly calling the `endTrial` action, we will trigger a timeout, and end the trial from it. // While waiting for the trial to end we want to prevent users from responding again. // Note that we only need to do this to the *base* trial, all other trials inherit everything from it... /* Inter trial interval */ { conditions: [{type:'inputEquals', value:'ITI'}], actions:[ {type:'hideStim',handle:'All'}, {type:'removeInput',handle:['red','blue','green']}, {type:'trigger', handle:'end',duration:500} ] }, // We've added three actions to each of the responses. // `hideStim` hides the target stimulus so that we see a blank screen as soon as a response is made. // `removeInput` removes the input listeners that have the handles *red*, *blue* and *green*, this prevents users from giving any further responses. // `trigger` triggers an internal player event as if the user has committed an action. // In this case, it triggers an event with the input handle `end` after a `duration` of 500 milliseconds. // Furthermore, we've added an interaction that responds to the `end` event, that ends the trial. // Note that the users can not trigger the `end` event directly, only through the events that were exposed to them using the `keypressed` input. /* End trial */ { conditions: [{type:'inputEquals', value:'end'}], actions:[ {type:'endTrial'} ] } ] }]); // Finaly, we need to add it to each of the specific color trials. // We can't add it to the *base* trial because the specific color trials make changes to `stimuli` and would overwrite it. API.addTrialSets('red',[{ inherit:'base', data: {group:'red'}, stimuli: [ {inherit:{set:'red',type:'exRandom'}, handle:'target'}, {inherit:'error'} ] }]); API.addTrialSets('blue',[{ inherit:'base', data: {group:'blue'}, stimuli: [ {inherit:{set:'blue',type:'exRandom'}, handle:'target'}, {inherit:'error'} ] }]); API.addTrialSets('green',[{ inherit:'base', data: {group:'green'}, stimuli: [ {inherit:{set:'green',type:'exRandom'}, handle:'target'}, {inherit:'error'} ] }]); // ### Sequence API.addSequence([ { mixer: 'random', data: [ { mixer: 'repeat', times: 20, data: [ {inherit:'red'}, {inherit:'blue'}, {inherit:'green'} ] } ] } ]); // Return script return API.script; });