coding a dual task with musical stimuli

[David McFarlane]

Pauline,

I did not look at the Dual Task example from PST, so I am just basing 
this on general knowledge of E-Prime SoundOut & SlideSound objects, 
quite apart from any dual task considerations.  Anyway, make sure 
that "Stop After" on your sound object is set to "No" -- set to "No", 
the sound should play through even if the stimulus object that 
started it ends first.  Set to "Yes", the sound will stop playing at 
the offset of the stimulus object that started it.

I explain this and more better in my online course.

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

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At 11/19/2013 10:55 AM Tuesday, pauline narme wrote:
>I would like some tips to code a dual task. My experiment is a 
>memory task with an encoding condition in divided attention.
>More precisely, subjects have to listen to musical excerpts (mean 
>duration around 10 sec) while they have to respond to a series of 
>trials involving responding to digits.
>I followed the dual task sample available on the PST website and did 
>exactly the same (i.e. "The start time is determined at the 
>beginning of the trial. The object presenting the word has a 
>Duration value of zero msec. This displays the word, then 
>immediately begins presentation of the digit task. The duration of 
>the word is set as an attribute in the WordList, but the actual 
>run-time duration is monitored by the digit trial"s)
>
>However, although the task is running without error, I can hear any 
>sound. This is probably due to the duration value of zero msec of 
>the sound "object", but if I change this value, this is not a dual 
>task anymore since the sound is first heard THEN digits appeared.
>
>Looking forward to read some help.
>
>Thanks,
>
>Pauline

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