nback

[ben robinson]

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 <mpaffel 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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