Count Button Presses in Trial with Fixed Duration

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Count Button Presses in Trial with Fixed Duration

Count Button Presses in Trial with Fixed Duration

Author	Message
Pete	Pete posted 7 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 2, Visits: 6	Hi everyone, I'm trying to create a trial lasting 3 min in which participants have to press the spacebar every time they come up with an idea. I would like to count how many times the participant presses the spacebar and if possible at what exact points in time during the 3 min interval the presses took place. I would really appreciate any help as I seem to be stuck.
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Dave	Dave posted 7 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 12K, Visits: 98K	+x Pete - Monday, November 20, 2017 Hi everyone, I'm trying to create a trial lasting 3 min in which participants have to press the spacebar every time they come up with an idea. I would like to count how many times the participant presses the spacebar and if possible at what exact points in time during the 3 min interval the presses took place. I would really appreciate any help as I seem to be stuck. You can achieve this using /isvalidresponse: <block ideablock> / trials = [1=ideatrial] </block> <trial ideatrial> / stimulusframes = [1=ideatext] / validresponse = (57) / isvalidresponse = [if (trial.ideatrial.response == 57) {values.spacebarcount +=1; values.keypresstimes = concat(concat(values.keypresstimes, trial.ideatrial.latency), ";"); false}] / timeout = 30000 </trial> <values> / spacebarcount = 0 / keypresstimes = "" </values> <text ideatext> / items = ("Press the spacebar whenever you have an idea.") </text> <data> / columns = [date time subject group blocknum blockcode trialnum trialcode stimulusitem response latency values.spacebarcount values.keypresstimes] / separatefiles = true </data> You'll find the total number of spacebar presses logged in values.spacebarcount; you'll find a list of the exact times when the presses occurred in values.keypresstimes (in milliseconds, measured from the start of the trial).
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Pete	Pete posted 7 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 2, Visits: 6	Thank you very much! Works perfectly!
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