Randomising the Fixation duration

[Krupa Sheth]

Thanks all for the very useful advice.

I tried to follow Michiel's inline line of thought using her code
suffix but it was coming to an E-Prime error. After having tried that
provided by David; it worked.. i even checked it out on the E-DataAid
file and all fixation durations were randomised... HALLELUJAH!!

Thanks so much. I really appreciate it :)

Best wishes,

Krupa
Research Associate
Cerebra Centre of Neurodevelopmental Disorders
University of Birmingham
Edgbaston
B15 2TT

On May 31, 3:56 pm, David McFarlane <mcfar... at msu.edu> wrote:
> Stock reminder:  1) I do not work for PST.  2)
> PST's trained staff takes any and all questions
> athttp://support.pstnet.com/e%2Dprime/support/login.asp
> , and they strive to respond to all requests in
> 24-48 hours -- this is pretty much their
> substitute for proper documentation, so make full
> use of it.  3) If you do get an answer from PST
> Web Support, please extend the courtesy of
> posting their reply back here for the sake of others.
>
> That said, here is my take...
>
> First, I agree that you would do well to work
> through Mich's E-Primer, as well as the Getting
> Started and User's Guides that came with E-Prime.
>
> Now, the inline code method allows you to easily
> randomize down to the ms, and without using
> attribute references.  OTOH, the lack of an
> attribute reference means that the data log
> contains no record of the randomized fixation
> duration.  So I would modify Mich's example as follows:
>
> c.SetAttrib "FixDur", Random(1500,3500)
>
> Then, in my fixation object, I would set Duration to "[FixDur]".  Done.
>
> But if you don't mind (or even prefer) a coarser
> grain (say, 1500 - 3500 ms in steps of 100 ms)
> then you can accomplish this without any inline
> code.  Just use a List, or perhaps a nested List,
> to hold all the possible fixation durations, and
> set the List Selection to Random.  Suppose we
> call that attribute (i.e., column)
> "FixDur".  Then, as before, in your fixation
> object set Duration to "[FixDur]".  Done.  (For
> more on nested Lists in particular, see Appendix
> C of the User's Guide that came with E-Prime.)
>
> -- David McFarlane, Professional Faultfinder
>
> At 5/31/2011 10:26 AM Tuesday, Michiel Spape wrote:
>
>
>
>
>
>
>
> >It's actually somewhere in the E-Primer:
> >http://www.cognitology.eu/pubs/AnE-Primer2009.pdf
> >  as an example of what to do with line-in
> >stuff... I suggest going through the last 2 chapters, or earlier.
> >But, then again, if you have a textdisplay
> >showing just a +, called FixationDisplay, and a
> >short inline before that:
> >FixationDisplay.Duration = Random(1500,3500) - you're done.
> >Best,
> >Mich
>
> >Michiel Spapé
> >Research Fellow
> >Perception & Action group
> >University of Nottingham
> >School of Psychology
> >www.cognitology.eu
>
> >-----Original Message-----
> >From: e-prime at googlegroups.com
> >[mailto:e-prime at googlegroups.com] On Behalf Of Krupa Sheth
> >Sent: 31 May 2011 14:34
> >To: E-Prime
> >Subject: Randomising the Fixation duration
>
> >Hi! I been totally baffled by this and I am sure there is a way where
> >to over come this.
>
> >Is there any function in E-Prime that allows the fixation point ("+")
> >to appear for a random duration between 1500ms to 3500ms. I am sure it
> >is possible but am so clueless how to do it.
>
> >Many Thanks!!

-- 
You received this message because you are subscribed to the Google Groups "E-Prime" group.
To post to this group, send email to e-prime at googlegroups.com.
To unsubscribe from this group, send email to e-prime+unsubscribe at googlegroups.com.
For more options, visit this group at http://groups.google.com/group/e-prime?hl=en.