Play slide object after n-trials using inline

[David McFarlane]

I think you need to use the Slide.Play method instead of Slide.Run -- 
see that topic in the E-Basic Help facility.

If your trials are not self-paced and all last for a known duration, 
then I have an alternative simple-minded idea.  Make two noise files 
for the entire duration of the run, one with white noise for the 
first half and silence for the second, and the other 
vice-versa.  Then just start the chosen white-noise file playing at 
the start of each run.

For more technical details on using Slide, SoundOut, and SoundBuffer 
objects, try asking PST's trained staff at 
http://support.pstnet.com/e%2Dprime/support/login.asp -- they strive 
to respond to all requests in 24-48 hours, and this is pretty much 
their substitute for proper documentation, so make full use of it.

-----
David McFarlane
E-Prime training 
online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter:  @EPrimeMaster (twitter.com/EPrimeMaster)


At 7/16/2012 02:41 PM Monday, Becks wrote:
>Hi all,
>
><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
>
>I currently have 3 different eprime paradigms which play tones for 
>use with EEG recording equipment, all of which function perfectly. 
>However, I have just been asked to add continuous background white 
>noise to each one, to last for half of each paradigm.
>
>
>
>I can't simply play a slide with a soundout object (whitenoise) and 
>set the properties to "stop after = no" and the "stop offset" to a 
>value that would stop the soundout object after half of the 
>particular paradigm I am running, as the white noise needs to be 
>counterbalanced across participants for first half of paradigm white 
>noise/ second half of paradigm white noise.
>
>
>
>For the white noise during second half of paradigm condition, I am 
>therefore trying to play an unreferenced slide with white noise 
>soundout object after n-trials. I am able to count the trials using 
>the following inline:
>
>
>
>Dim g_nTotalTrial as Integer 'in user tab
>
>
>
>g_nTotalTrial = 0 'top level inline
>
>
>
>g_nTotalTrial = g_nTotalTrial+1 'inline at start of trialproc
>
>
>
>
>
>And I am able to play an unreferenced slide (called whitenoise) 
>using the following inline:
>
>
>
>whitenoise.run
>
>
>
>I am struggling to link the two together, to play the slide after 
>n-trials. I have tried using the following inline with no success:
>
>
>
>c.SetAttrib "TrialCount", g_nTotalTrial
>
>
>
>If TrialCount = 6 Then whitenoise.run
>
>
>
>
>
>I would be incredibly grateful if anyone can point me to any 
>relevant literature or forum posts that I have missed, as I have 
>scoured the user manuals and internet with no success. Or, if this 
>is not as simple a problem as I suspect, does anyone have any ideas 
>about how to get around it?
>
>
>
>Many thanks for any help you can offer.

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