By TDeramus - 10/9/2014
Hello all.
I'm attempting to make a 4 point likert scale in response to pictures presented in an MRI scanner.
The participant won't have access to a mouse or keyboard, and our joystick only reads keyboard responses of 6, 7, 8, and 9.
I'd like to map the likert to the keyboard so that 1 = 6, 2 = 7, 3 = 8, and 4 = 9, but I don't see exactly how to do that from the element page.
Does anyone know how to map button presses to the likert command or would I be better off making response images?
-Thomas
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By Dave - 10/9/2014
You would not use the <likert> element in this particular use case, but set this up using standard <trial> etc. elements instead.
Something along the lines of
<values> / scalevalue = 0 </values>
<data> / columns = [date,time,subject,blocknum,blockcode,trialnum,trialcode,latency,response,values.scalevalue, ...] </data>
<block myblock> / trials = [1=customlikert] </block>
<trial customlikert> / ontrialend = [if (trial.customlikert.response == 7 || trial.customlikert.response == 77) values.scalevalue = 1] / ontrialend = [if (trial.customlikert.response == 8 || trial.customlikert.response == 71) values.scalevalue = 2] / ontrialend = [if (trial.customlikert.response == 9 || trial.customlikert.response == 72) values.scalevalue = 3] / ontrialend = [if (trial.customlikert.response == 10 || trial.customlikert.response == 73) values.scalevalue = 4] / stimulusframes = [1=one, two, three, four] / validresponse = ("6", "7", "8", "9") / responsemessage = ("6", onehl, 500) / responsemessage = ("7", twohl, 500) / responsemessage = ("8", threehl, 500) / responsemessage = ("9", fourhl, 500) </trial>
<text one> / items = ("1") / size = (100px, 100px) / position = (35%, 60%) / txcolor = (white) / txbgcolor = (black) </text>
<text two> / items = ("2") / size = (100px, 100px) / position = (45%, 60%) / txcolor = (white) / txbgcolor = (black) </text>
<text three> / items = ("3") / size = (100px, 100px) / position = (55%, 60%) / txcolor = (white) / txbgcolor = (black) </text>
<text four> / items = ("4") / size = (100px, 100px) / position = (65%, 60%) / txcolor = (white) / txbgcolor = (black) </text>
<text onehl> / items = ("1") / size = (100px, 100px) / position = (35%, 60%) / txcolor = (black) / txbgcolor = (grey) </text>
<text twohl> / items = ("2") / size = (100px, 100px) / position = (45%, 60%) / txcolor = (black) / txbgcolor = (grey) </text>
<text threehl> / items = ("3") / size = (100px, 100px) / position = (55%, 60%) / txcolor = (black) / txbgcolor = (grey) </text>
<text fourhl> / items = ("4") / size = (100px, 100px) / position = (65%, 60%) / txcolor = (black) / txbgcolor = (grey) </text>
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