variable interstimulusinterval

[Michiel Spape]

Hi,
This was assuming that 'between two values' was a value in-between the two, rather than either value1 or value2, which Liwenna proposes. To compensate, the following script could do just that (step 1 is same):
2. write the following in it: if random(1,2) = 1 then ISI.duration = 500 else ISI.duration = 2000

By the way, I was wondering why the Files section of the googlegroups seems to be used so little? Would it be possible for me to upload experiments there, or is it not set to public? Also, it wouldn't hurt having specific folders there for A: problematic experiments (so people can check your problem) and B: common paradigms (available for use by anyone). Right now it's a bit of a mess.
Best,
Mich

Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology


-----Original Message-----
From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of Michiel Spape
Sent: 24 June 2009 12:58
To: e-prime at googlegroups.com
Subject: RE: variable interstimulusinterval


Hi,
Of course, you could always use a bit of script (some people go quite far to avoid it). Consider the ISI is a textdisplay (or whatever).
1. Add an inline just before the ISI
2. write the following in it: ISI.duration = random(500,2000)
Done. 

Best,
Mich

PS: more helpful suggestions and bad grammar in: http://www.cognitology.eu/pubs/AnE-Primer2009.pdf

Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology


-----Original Message-----
From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of liwenna
Sent: 23 June 2009 19:58
To: E-Prime
Subject: Re: variable interstimulusinterval


make an attribute called objectduration in a list somewhere.... either
make a separate list with two levels, one level duration A, the other
duration B (in milliseconds) and nest the list(s) you have in your
current setup into this list, or (if the number if levels in your
current list is moderate) duplicate the current levels you have and
give half of them duration A under the attribute objectduration and
the other half duration B. In the properties of your object make
'duration' refer to the objectduration attribute in your list: type
[objectduration] in the objectproperties duration box. The program
will now, for each showing of your object, use the duration defined in
the triallist.

Good luck!

On Jun 23, 6:47 pm, Harold Mouras <hmou... at gmail.com> wrote:
> Hello,
>
> Please forgive this silly question...
>
> We constructed an e prime run with an ISI stimulus. This is an object. We
> would like to make the duration of this stimulus random between two values
> but do not find any solution at the moment.
>
> Could someone help us ?
>
> Thank you very much in advance,
>
> Sincerely yours,
>
> Harold Mouras


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