How to code parallel tasks?

[Kate Cox]

Hi Eric
I am very new to creating tasks using script in eprime and have been 
struggling to make a dual attention task which I think is very similar to 
the one you you described.
I need participants to use their mouse to track a moving target on screen 
while simultaneously listening to a audio file (or a series of individual 
audio files) that gives them a list of things they'll need to remember in a 
later memory task.

I was wondering if you could give me any advice on how you created your 
task. I've tried adapting with the Track Mouse Coordinates sample on the 
PST website to at least get the tracking/pursuit task working but being so 
new to scripts I'm having real trouble as I've only ever used e-objects to 
create tasks and never used the canvas feature before.

Any help you can offer would be hugely appreciated.

Thanks
Kate 




On Thursday, 3 December 2009 12:16:38 UTC+11, ccpin wrote:
>
> Hello Michiel, 
>
> We did it, thanks to your great tips. I would be very happy to share 
> the program with you if you're interested. 
>
> eric 
>
> On Nov 26, 10:52 pm, Michiel Spape <Michiel.Sp... at nottingham.ac.uk> 
> wrote: 
> > Hi, 
> > Basically, I see two solutions: 
> > - Just don't let the sound end as the slide ends (for example by using 
> an inline script to make the audio play; or set its StopAfter property to 
> No). Slide duration doesn't need anything to do with the sound duration. 
> > - Do some looping with two little inlines: 
> > 1. Just before the slide (the slide being 25 ms) 
> > BeforeSlide:          'note that : indicates it being a lable 
> > Dim TimeStarted as long 
> > TimeStarted = clock.read 
> > 
> > 2. One after the slide 
> > If (clock.read - TimeStarted) < 1000 then  'only do it if less than 1s 
> has passed 
> >         'change some properties of the slide here, or update the 
> location of your mouse 
> >         Goto BeforeSlide 
> >         End if 
> > 
> > Or, for more fun, do it all in canvas - I have a little programme 
> demonstrating a tracking experiment almost entirely written in canvas 
> procedures, let me know if you're interested. 
> > 
> > Best, 
> > Mich 
> > 
> > Michiel Spapé 
> > Research Fellow 
> > Perception & Action group 
> > University of Nottingham 
> > School of Psychology 
> > 
> > 
> > 
> > -----Original Message----- 
> > From: ccpin [mailto:chern... at gmail.com] 
> > Sent: 25 November 2009 00:17 
> > To: E-Prime 
> > Subject: Re: How to code parallel tasks? 
> > 
> > Hello everyone, 
> > 
> > To quickly recap, I am trying to implement a divided attention task 
> > where users perform a visual smooth pursuit (mouse tracking a target) 
> > and an auditory no/no go (respond to even digits) simultaneously. 
> > 
> > What I have now is a slide within a list. Each time the slide is 
> > shown, it plays a digit (sound file) and displays the updated target 
> > (jpg). 
> > 
> > The main problem I now have is with timing. I've had to keep the slide 
> > on long enough (1 s) to a) let the sound file finish playing, and b) 
> > capture a response. However, the image therefore appears jittery, as 
> > it only refreshes every 1 s. 
> > 
> > Ideally, I like to refresh the image every 25 ms. Does anyone know how 
> > I can use inline while the slide is running to refresh the image? Or 
> > is there another way to make the image transition smooth? 
> > 
> > Thanks a lot, 
> > 
> > eric 
> > 
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