Dual Task

[francesco biondi]

Hi all,

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

[David McFarlane]

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 )

/----
Stock reminder: 1) I do not work for PST. 2) PST's trained staff
take any and all questions at https://support.pstnet.com , and they
strive to respond to all requests in 24-48 hours, so make full use of
it. 3) In addition, PST offers several instructional videos on their
YouTube channel (http://www.youtube.com/user/PSTNET ). 4) If you do
get an answer from PST staff, please extend the courtesy of posting
their reply back here for the sake of others.
\----

[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

[francesco biondi]

Thanks David!

I tried to solve the issue as follows:

- I put a Waitobject (Duration 0, Allowable Correct1, Correct Correct1, TimeLimit 2000, EndAction none) before the Slide1 (it contains s1)

- After, Slide1 (Duration SOA, EndAction Terminate)

- After, Slide2 (it contains s2) (Duration 2000, Allowable Correct2, Correct Correct2, EndAction Terminate)

By doing so, it does not clear Slide1 after the button press. I can use an  Inputobject to do so, by following your advise.

It seems wotking

[David McFarlane]

Francesco,

Great! Glad you got it working, even though my code example was
wrong. In case anybody else chances on this thread, here is a
corrected code sample

Do While (s1.InputMasks.IsPending and s2.InputMasks.IsPending)

If Not(s1.InputMasks.IsPending) Then s1.Clear
If Not(s2.InputMasks.IsPending) Then s2.Clear

Loop
' expect that s1 & s2 both also get cleared by subsequent program...

And of course, for more information, one may look at the
InputMask.IsPensing and StimDisplay.Clear topices in the E-Basic Help facility.

Regards,
-- David McFarlane

At 10/18/2013 02:22 PM Friday, francesco biondi wrote:
>Thanks David!
>
>I tried to solve the issue as follows:
>
>- I put a Waitobject (Duration 0, Allowable Correct1, Correct
>Correct1, TimeLimit 2000, EndAction none) before the Slide1 (it contains s1)
>
>- After, Slide1 (Duration SOA, EndAction Terminate)
>
>- After, Slide2 (it contains s2) (Duration 2000, Allowable Correct2,
>Correct Correct2, EndAction Terminate)
>
>By doing so, it does not clear Slide1 after the button press. I can
>use an Inputobject to do so, by following your advise.
>
>It seems wotking
>
>
>
>On Friday, October 18, 2013 12:10:02 PM UTC-6, McFarlane, David 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>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>http://psychology.msu.edu/Workshops_Courses/eprime.aspx
>
>Twitter: @EPrimeMaster
>(<https://twitter.com/EPrimeMaster>https://twitter.com/EPrimeMaster )

>
>/----
>Stock reminder: 1) I do not work for PST. 2) PST's trained staff
>take any and all questions at

><https://support.pstnet.com>https://support.pstnet.com , and they

>strive to respond to all requests in 24-48 hours, so make full use of
>it. 3) In addition, PST offers several instructional videos on their
>YouTube channel

>(<http://www.youtube.com/user/PSTNET>http://www.youtube.com/user/PSTNET

>). 4) If you do
>get an answer from PST staff, please extend the courtesy of posting
>their reply back here for the sake of others.
>\----
>
>
>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
>

>--
>You received this message because you are subscribed to the Google
>Groups "E-Prime" group.
>To unsubscribe from this group and stop receiving emails from it,
>send an email to e-prime+u...@googlegroups.com.
>To post to this group, send email to e-p...@googlegroups.com.
>To view this discussion on the web visit
><https://groups.google.com/d/msgid/e-prime/e3e142df-825b-4df6-8f1a-b30e7d34f78b%40googlegroups.com>https://groups.google.com/d/msgid/e-prime/e3e142df-825b-4df6-8f1a-b30e7d34f78b%40googlegroups.com.
>For more options, visit
><https://groups.google.com/groups/opt_out>https://groups.google.com/groups/opt_out.