nback

[Matt Paffel]

"i wrote that program"  that's too funny. your explanation makes
perfect sense, I'm glad i got the expert on the subject.
thanks for clarifying.

On Aug 25, 6:20 pm, ben robinson <baltimore.... at gmail.com> wrote:
> see, here's the thing.  i wrote that program, but it's been years since i've
> looked at it, and if i were asked today to provide an n-back program i'd
> probably make it from scratch...
> that said, i believe that the "listFIRSTS" is a list of trials, applicable
> across all blocks (0-back, 1-back, etc), wherein targets are never
> presented.  this was the work-around i came up with to avoid having a target
> trial randomly selected, say, in the second trial during the 3-back block.
>  that wouldn't work because you'd not yet have encountered three stimuli
> from which to repeat the 3rd one back.
> i'm not thrilled to hear that listFIRSTS was causing you problems with the
> 0-back, but at the same time i'm pretty sure (if memory serves) that
> listFIRSTS is necessary to prevent premature target trials across all
> conditions.
>
> ben
>
> On Wed, Aug 25, 2010 at 7:09 PM, Matt Paffel <mpaf... at gmail.com> wrote:
> > welp, i've been modifying it into a 2-back & 0-back. I've found that
> > the "listFIRSTS" procedure interferes with the data collection on the
> > 0-back procedure so I've taken it out and have had no problems with
> > it.  However, If I take it out of the 2-back procedure everything goes
> > to er, heck. Am i right to think that it serves the purpose of setting
> > up the Target and Nontarget array in the 2-back procedure even though
> > the same inlines are present in the NonTarget procedure? I'm kind of
> > trying to figure out a work around as I have to have the 2-back run
> > two blocks of different images, one with words and the other with
> > impossible objects, and I'd like to try to not overburden eprime with
> > unnecessary objects and scripts.
>
> > On Aug 25, 5:44 pm, ben robinson <baltimore.... at gmail.com> wrote:
> > > maaaybe.  why?
>
> > > On Wed, Aug 25, 2010 at 6:40 PM, Matt Paffel <mpaf... at gmail.com> wrote:
> > > > Hello Everyone,
>
> > > > Just a quick question, has anyone ever used the nback task that can be
> > > > downloaded from the STEP Psychology site?
>
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