Millisecond Forums

Hey all, 

I have a bit of code and I am not sure I'm understanding it correctly. I am basing my experiment on someone else's work, so am slowly figuring out how it works. Find the relevant code below (and my questions underneath that).

<text Intrusion>
/ items = ("How <b>often</b> did you <b>think</b> about the <b>scene</b>?
    <center><br><br><b>NEVER ---- BRIEFLY ---- OFTEN</b>
    <center><br> (1) ----------- (2) ----------- (3) </b>"
    )
/ position=(50%, 50%)
/ color = white
/ txbgcolor = white
/ txcolor = black
/ fontstyle = ("Arial", 3%)
</text>


<trial Intrusion>
/ stimulustimes = [1=Intrusion]
/ trialduration = 2500
/ inputdevice=keyboard
/ correctresponse=("1","2","3")
/ recorddata = true // check response given before 2000 ms and if present blank screen
if (trial.Intrusion.responselatency > 0 && trial.Intrusion.responselatency < trial.Intrusion.trialduration)
screencolor = "black"
endif
/ posttrialpause = (500)
</trial>

Questions:
- Am I correct in interpreting that the trial is always 2500ms, but if there is a response the screen goes blank (e.g. if the response is given after 1000ms, then the trial lasts another 1500ms but with a blank screen, followed by 500ms trial pause). In the data file I see that the latency is 2000ms when there is no response (and when there is a response the reaction time simply is logged). Trial duration is always logged as 2500ms.
- Does this mean that a trial is always 3000ms (2500 intrusion + 500 posttrialpause) regardless of how quickly someone responds (within the intrusion trial)?
- I don't follow why the recorddata element somehow checks if a response is given before 2000ms (because it simply seems to be a programmer's note). It is not defined anywhere in the script. Is this maybe an Inquisit default setting? 
- There is a screencolor black element in the if code, but that does not seem to be called upon (not that I want it to do that), but I simply wondered if I could remove it without 'breaking' anything'.
- Finally, the 'if' element is presented in bold and purple, but the endif is not. Is this an issue?

Thanks for any help in advance!

Kevin