Dual Task

[David McFarlane]

Francesco,

Oh, to have that inline code run during s2, you have to set Duration 
of s2 to 0, or set its PreRelease to "(same as duration)" (which is 
the new default anyway).

-- David McFarlane


At 10/18/2013 02:10 PM Friday, David McFarlane wrote:
>Francesco,
>
>To get responses to both s1 and s2, simply add an input mask with 
>appropriate Time Limit to each of them -- please see the "Extended 
>Input" tutorial in Appendix C of the User's Guide that came with 
>E-Prime (and if you have not already, please first work through 
>*all* of the tutorials in *all* the Guides before you start work 
>with E-Prime, it is well worth the effort!).
>
>You can superimpose visual stimuli with creative use of their Frame 
>and BackStyle properties.  I have done this myself to make all sorts 
>of interesting effects.
>
>To make s1 & s2 disappear upon response...  Hmm, well, you might use 
>Clear After to clear s2 (even though Clear After is deprecated, see 
>http://www.pstnet.com/support/kb.asp?TopicID=4946 ), but you still 
>need a bit of inline code to clear s1, so you might as well do them 
>both in code.  Something like
>
>     Do While (s1.InputMasks.IsPending and s2.InputMasks.IsPending)
>         If s1.InputMasks.IsPending Then s1.Clear
>         If s2.InputMasks.IsPending Then s2.Clear
>     Loop
>     ' expect that s1 & s2 both also get cleared by subsequent program...
>
>but maybe that gives you enough to start with and you can fix it up 
>as an exercise.  (Advanced exercise:  Make efficient algorithm to 
>handle general case of multiple stimuli with responses.)
>
>-----
>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 10/17/2013 05:58 PM Thursday, francesco biondi wrote:
>>I am designing an experiment using a dual task paradigm.
>>I have two stimuli: s1 and s2, and 2 responses: r1 and r2.
>>
>>After the fixation point, s1 appers on the right side of the screen 
>>and, after a given soa, s2 appears on the left side of the screen.
>>I need to record both the responses r1 and r2.
>>
>>Since soas are very short (150 and 300ms), subjects won't be able 
>>to produce r1 by the time s2 appears.
>>Nonetheless, I still need s1 to be visible to let subjects to produce r1.
>>
>>My question is:
>>do you know how i can have (after the soa) both the stimuli on the 
>>screen and record both r1 and r2?
>>Also, I would like to s1 and s2 to disappear when, respectively, r1 
>>and r2 are produced.
>>After r2 is produced the next trial starts.
>>
>>Thanks
>>
>>Francesco

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