Millisecond Forums

Greetings, 

I am new to Inquisit and I am still finding ways to come to terms with not having the ability to use variables in the sense I am used to, and I am trying to do what I can with the values attribute.

Goal: I am creating a memory encoding task whereby I would like either a green or red fixation cross to appear on the screen within a trial, when a subject makes the correct or incorrect response respectively. I am unsure how to implement this however what I have tried here is to create two values before the trial, which are then imputed with the latency / 20 rounded - to convert latency to a stimulus frames number - and then this value is used as input to the stimulusframes field to be used as the fixation cross text element onsets within the trial. 

Problem: The code below attempts to implement this concept, yet it does not run as I am unsure if this means of imputing a value for stimulusframes is permissible. Is there a way to get this implementation to run? Or otherwise is there a better way to implement this feature of the task? When I try to run the code below I get the following error, yet I am not sure what this is indicating. Error: Missing ',' or '-' before 'varFrameCor'.

Please let me know if any further code or elaboration would be helpful. Many thanks!
Thomas

<block enc1block>
/ trials = [1-4 = sequence(enc1)]
/ preinstructions = (encinstruc1)
/ errormessage = false
/ postinstructions = (encfeedbackpage1)
</block>

<values>
/ varFrameCor = 0
/ varFrameIncor = 0
</values>

<trial enc1>
/ validresponse = ("a","s","d","j","k","l")
/ beginresponsetime = 0
/ numframes = 250
/ responseinterrupt = frames
/ branch = [
  if (computer.scancodetochar(trial.enc1.response) == list.answersCorr1.nextvalue)
    values.varFrameCor = round(trial.enc1.latency / 20);
  else if (computer.scancodetochar(trial.enc1.response) == list.answersCorrTS1.nextvalue)
    values.varFrameIncor = round(trial.enc1.latency / 20);
  else
    values.varFrameIncor = round(trial.enc1.latency / 20);
]
/ stimulusframes = [varFrameCor=fixationGreen; varFrameIncor=fixationRed; 1=encObjects1; 250=blank; 1=L1reminderenc; 1=L2reminderenc; 1=L3reminderenc; 1=R1reminderenc; 1=R2reminderenc; 1=R3reminderenc]
</trial>

<text fixationRed>
/ items = ("+")
/ color = red
/ txbgcolor = (transparent)
/ fontstyle = ("Arial", 20pt)
</text>

<text fixationGreen>
/ items = ("+")
/ color = green
/ txbgcolor = (transparent)
/ fontstyle = ("Arial", 20pt)
</text>