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Avoiding False Collects on the BART

JDC — Sun, 15 Jun 2014 19:36:11 GMT

Hi,

I'm using the Balloon Analogue Risk Task (BART) template from the Inquisit Task Library, but I'm having a problem with it - if a participant presses Collect twice in a row (which is easy to do by accident), then they are recorded as having made zero button presses for that balloon, which artificially drags down the adjusted average (as the balloon is not considered to have exploded either).

I'd like to modify the template so that the Collect button cannot be pressed until the Pump button has been pressed at least once on each balloon, but I'm having difficulty with this (my solutions have mostly involved the / validresponse expression but if it considers every Collect press to be invalid then it breaks the program).

Does anybody know of a solution to this problem?

Thank-you for your time,

James

RE: Avoiding False Collects on the BART

RH — Sun, 15 Jun 2014 19:36:11 GMT

Thanks for your help :)

RE: Avoiding False Collects on the BART

Dave — Sun, 15 Jun 2014 16:19:19 GMT

As the post says, you add it somewhere in <trial choice>. Exactly where does not matter in this case, but I would put it in the vicinity of / below the existing /validresponse attribute.

RE: Avoiding False Collects on the BART

RH — Sun, 15 Jun 2014 15:45:13 GMT

Hi Dave,

This is great advice. When inserting this into the script where would you put it? (I am sorry if this is really obvious it is my first time working with a program like this).

<trial choice>
/ ontrialbegin = [values.countchoice += 1]
/ ontrialbegin = [values.pumpresult = list.pumpresult.nextvalue]

/ontrialbegin = [if (values.pumpsound == 1) trial.choice.insertstimulustime(sound.inflatesound,0)]
/ontrialbegin = [values.pumpsound = 0]

/ stimulustimes = [1=collectbutton, balloon, pumpbutton, totalearnings, pumpcount, potentialearnings, ballooncount]
/ inputdevice = mouse
/ validresponse = (collectbutton, pumpbutton)
/ monkeyresponse = ("collectbutton", "pumpbutton", "pumpbutton", "pumpbutton", "pumpbutton", "pumpbutton", "pumpbutton", "pumpbutton", "pumpbutton",
"pumpbutton", "pumpbutton", "pumpbutton", "pumpbutton", "pumpbutton", "pumpbutton", "pumpbutton", "pumpbutton", "pumpbutton", "pumpbutton")

/ ontrialend = [if (trial.choice.response == "pumpbutton" && values.countchoice == 1)
      values.timebefore1stpump = trial.choice.latency ]
/ ontrialend = [if (trial.choice.response == "pumpbutton" && values.countchoice > 1)
      {values.timebtwpumps = trial.choice.latency;
      values.sum_timebtwpumps += values.timebtwpumps }]
/ ontrialend = [if (trial.choice.response == "collectbutton" && values.countchoice == 1)
      values.timebeforecollectwithoutpump = trial.choice.latency ]
/ ontrialend = [if (trial.choice.response == "collectbutton" && values.countchoice > 1)
      values.timebtwlastpumpandcollect = trial.choice.latency ]

/ ontrialend = [if (trial.choice.response == "pumpbutton") picture.balloon.width += values.balloonsizeincrement]
/ ontrialend = [if (trial.choice.response == "pumpbutton")picture.balloon.height += values.balloonsizeincrement]
/ ontrialend = [if (trial.choice.response == "pumpbutton")shape.blank.width = picture.balloon.width]
/ ontrialend = [if (trial.choice.response == "pumpbutton")shape.blank.height = picture.balloon.height]
/ ontrialend = [if (trial.choice.response == "pumpbutton")values.pumpcount += 1]

/ ontrialend = [if (trial.choice.response == "pumpbutton")values.totalpumpcount += 1]
/ ontrialend = [if (trial.choice.response == "pumpbutton" && values.ballooncount < 11) values.totalpumpcount_10 += 1]
/ ontrialend = [if (trial.choice.response == "pumpbutton" && values.ballooncount > 10 && values.ballooncount <21 ) values.totalpumpcount_20 += 1]
/ ontrialend = [if (trial.choice.response == "pumpbutton" && values.ballooncount > 20 && values.ballooncount <31 ) values.totalpumpcount_30 += 1]

/ ontrialend = [if (trial.choice.response == "pumpbutton" && values.pumpcount >1) values.mean_timebtwpumps = values.sum_timebtwpumps / (values.pumpcount-1) ]

/ontrialend = [trial.choice.resetstimulusframes()]

/ branch = [if (values.pumpresult == 1 && trial.choice.response == "pumpbutton") trial.pop]
/ branch = [if ( trial.choice.response == "pumpbutton") {values.pumpsound = 1; trial.choice}]
/ branch = [if ( trial.choice.response == "collectbutton") trial.collect]

/ recorddata = true
</trial>

Thank you,

Rachel

RE: Avoiding False Collects on the BART

JDC — Wed, 20 Feb 2013 21:56:08 GMT

Excellent, thanks very much for your help Dave, that worked perfectly!

- James

RE: Avoiding False Collects on the BART

Dave — Tue, 19 Feb 2013 15:21:18 GMT

You could add

/ isvalidresponse = [values.pumpcount<1 && trial.choice.response=="pumpbutton"]
/ isvalidresponse = [values.pumpcount>=1 && trial.choice.response=="pumpbutton"]
/ isvalidresponse = [values.pumpcount>=1 && trial.choice.response=="collectbutton"]

to <trial choice>, which will basically disable the collectbutton for the 1st pump trial. I.e., subjects have to pump at least *once* before they can collect.

Regards,

~Dave