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Forum Newbie
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Last Login: 4/28/2008 11:09:41 AM
Posts: 6,
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| I would like to know if it is possible to have ISI that could vary in time during the experiment. I thought I could have fixation points between each stimuli and that these points could have aleatory durations (between 50 and 1000 ms) but I really don't know how to do this with E Prime. If any have suggestions??? Thanks a lot
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Forum MVP
Group: Administrators
Last Login: Today @ 9:12:01 AM
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| You can do this by varying the Duration property with a [attrib] reference. 1) Create columns in your List, i.e. Duration1, Duration2 and enter the values you wish
2) In the Fixations, enter [Duration1], [Duration2], etc. The [attrib] syntax looks up the value in the Context at runtime and uses it. -Brandon
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Forum Newbie
Group: Forum Members
Last Login: 4/28/2008 11:09:41 AM
Posts: 6,
Visits: 32
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| Thanks for your very quick response. I understood how to do this and I can conclude from what you wrote that E prime cannot generate an aleatory sequence of numbers between 100 and 1000 ms and that I have to generate it by myself and then import it in EPrime Attributes ??? Aimée
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Forum MVP
Group: Administrators
Last Login: Today @ 9:12:01 AM
Posts: 549,
Visits: 1,196
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| Set the levels to the number of trials you want or set one level with a weight you wish. Then in an InLine in your trial procedure, place the following code. c.SetAttrib "Duration", Random(100, 1000) -Brandon
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