Dot-Probe task using E-Prime

[liwenna]

I sent a complete script to sirous, but for everybody else I post a
screenshot and some explanation here too... (I so often found threads
that should contain the answer to my question... but do not as people
continued in private e-mail).

Screenshot:
http://images.redial.net/awdpsirous.bmp

Explanation:
You want to counterbalance the position of the 'type of words', the
position of the probe and the identitiy of the probe, as well as
randomise the trial order.
To do all this we use two lists... the first list contains the
stimuluswords (stimword1 and stimword2) and for logging purposes I
also included a variable 'trialtype' so you can easily see in your
data which trial is which type... you might consider recoding these
into 1, 2, 3 right away (simply change that in the list or add another
attribute) so that for instance spss will later be able to easy
separate the different type of trials. You can add your remaining 42
word-combinations in here. Every trial will start with e-prime
choosing one of the word combinations, at random. If you need blocks
of the same trials (neg-neut, hap-neut etc), then we'll need an extra
list before this one, but I don't think this is the case, right?

Now, nested in this list is the 'positions' list (or positions and
probe id would be more accurately). It seemed most simple to just make
a list with all possible combinations of word-positions, 'probetype',
and probepositions in it. The position of the stimwords are given in
'posstim1' and 'posstim2', if you'll look at the properties of the
text-displays in the 'stimuli-slide' you'll see that for the y-
position of the frame it refers to these attributes: [posstim1] and
[posstim2]. This way the text-displays (with the stimwords which it
gets trough calling into [stimword1] and [stimword2] ) will be
displayed at y-positions 25% and 75% of the screen, ergo, top and
bottom. Then the probe, I used eiterh * or ** here, obviously you can
change this into any probes you like. The attribute 'cresp' refers to
the correct response... for my probes * and ** I will use buttons on a
SR-box, but in this version the two mousebuttons are you used...
obviously you can change all this in the stimuli-slide properties.
Lastly the attribute 'posprobe': this one is called upon by the probe-
texdisplay in the prob-slide in the same way as the stimulusdisplays
called into this list for their position, and it determines whether
the probe will be shown in the position of stimword1 or stimword2.

Regards,


liwenna

On May 9, 12:48 pm, S.Mob... at uea.ac.uk wrote:
> Hi Many thanks for your message. I am using the word pairs (e.g., shy and
> rug), one presented above the other (top and bottom position) but I need
> to counterbalance this, so for some subjects (50%) shy is the top word and
> for some others (50%) it is the bottom word.
> Altogether, I have 45 fixed pairs of words as my verbal stimuli, i.e. 15
> pairs of POSITIVE words and Neutral (e.g., happy and pivot), 15 pairs of
> NEGATIVE words and Neutral (e.g., insecure and tortoise), and 15 pairs of
> BODY SENSATION and Non-body sensation words (e.g., Edgy and Dial).
> I need to randomise the order of word pair presentations for each subject
> so that each subject will receive the word pairs in a randomised order. I
> also need to control the appearance of the probe (50% at the position of
> the top word and 50% at the position of the bottom word).
> Thank you very much for your help.
> Sirous
>
>
>
> > Are your stimuli pictures or words? Do you need fixed stimulus pairs
> > (for instance when using two facial pictures of the same person in
> > each trial) or should stimulus pairs be randomised?
> > Do you need control over the contingency with which the probe appears
> > on the position of either of the stimulus (or should it just be 50% on
> > each type of stimulus?)
>
> > I'll get back to you on monday with more details when I am on my 'e-
> > prime' computer.. I just happened to have been working on dot probes
> > for the past few weeks. ;)
>
> > On May 7, 4:45 pm, Sirous <S.Mob... at uea.ac.uk> wrote:
> >> Hi I wonder if anybody can provide me with some information about how
> >> to set up dot-probe task using E-Prime. many thanks for your help
> >> Sirous
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