PASAT

[David McFarlane]

David,

First, my standard reminders:  1) I do not work for PST.  2) PST's 
trained staff really does like to take any and all questions at 
http://support.pstnet.com/e%2Dprime/support/login.asp , and they 
strive to respond to all requests in 24-48 hours.  So don't be shy 
there.  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 ...

1a) Just repeating liwenna's fine answer, if you have a fixed set of 
problems (addenda) then you could just add the answer as another 
attribute as in any other List; but just as with any other List, you 
would not then have to present these in fixed order, you could still 
randomize the trial order, unless I'm missing something.

1b) Expanding on liwenna's script approach, you could compute the 
correct answers in script.  In general, for an introduction to 
E-Basic script, please work through Chapter 4 of the User's Guide 
that came with E-Prime.

2) You may do this with the Advanced input mask features, please 
search the E-Prime Google Group or the PST Forum using terms like 
"MaxCount" or "TerminationResponse", or look at these topics under 
InputMask in the online E-Basic Help.

-- David McFarlane, Professional Faultfinder
"For a successful technology, reality must take precedence over 
public relations, for nature cannot be fooled."  (Richard Feynman, 
Nobel prize-winning physicist)


>Hello David,
>
>No PASAT ready made here but I can give some idea's on your questions.
>
>For the correct answer I see two different options. Either you don't
>randomize the trials but keep a fixed order in which case you can
>simply create a attribute to each level (trial) that holds the sum of
>that trial's number and the previous... non-randomized PASAT's are
>pretty common I think? (also see below). Alternatively you can create
>a 'user tab defined variable' that carries information over to the
>next trial. On the script window in the lower left corner open the
>user-tab and type "dim prevnumber as integer". Now at the end of the
>trialproc insert an inline that assigns that trial's number the value
>of prevnumber: "prevnumber = c.getattrib ("number") " wherein "number"
>is the name of an attribute in your triallist that holds the value of
>the number given in that trial (assuming that numbers will be
>presented auditory?).  At the begin of the trialproc insert an inline
>that calculates the correct answer based on the current trial's number
>and the previous trial's number: " c.setattrib "correct", prevnumber +
>c.getattrib ("number") ". This attribute "correct" should also be
>created in your triallist and it's cells simply left empty, they will
>be filled as the program runs.
>
>Then the indication of two-digit answers... I am affraid I have no
>really good ideas regarding that. Hopefully others will. But do I
>understand it right that you want your participants to type in their
>answer? I've never seen a pasat 'in action' but isn't it more common
>(and more 'paced' ) to have them answer verbally? Which would require
>answers to be recorded and scored 'by hand' which then also would
>render non-randomized trials a more attractive option?
>
>
>I hope the above is somewhat helpful to you,
>
>Best,
>
>liw
>
>
>On Nov 10, 10:53 am, David Moore <D.Mo... at bath.ac.uk> wrote:
> > Dear all,
> >
> > I am trying to program a Paced Auditory Serial Addition Task (PASAT) and am
> > wondering if anybody has programmed one of these before and can help. The
> > task essentially involves presenting numbers to participant and asking them
> > to indicate what the sum of the previous two numbers is.
> >
> > I have a few problems programming this which people may be able to
> > independently help with if no one has a PASAT task. First how would I allow
> > participants to indicate that the answer is a two digit number. Second how
> > would I indicate to eprime that the correct answer is the sum of the
> > previous two answers?
> >
> > Best
> > David


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