visual dot probe experiment: position of words & pictures

[liwenna]

That's an excellent point you raise regarding top-bottom comparisons,
Paul!

On the other hand and to expand: literature on dot probes using word
stimuli has it, that the reading effect is influencing rt's too much
when a horizontal arrangement is used and that for this reason word
dot probes ought to always use a vertical arrangement. Moreover:
counterbalancing the positions of the negative and neutral words over
the top and bottom position should cancel out possible effects from
top-to-bottom display drawing.

Still a good point that you raised, I nearly always use horizontal
arrangements but I had never thought of this before.

I am also at Leiden university and I'll see Suzanne this afternoon for
some 'real life' trouble shooting. Your name is Dutch, are we having
an all Dutch thread here?

best,

AW



On 31 mei, 00:17, Paul Groot <pfc.gr... at gmail.com> wrote:
> Hi Suzanne,
>
> I'm not sure if I completely understand the layout you are aiming for,
> but I think most of the problems could be solved if you start using a
> single Slide object with placeholders for the text and picture
> objects. Use the []-syntax to 'autofill' the words and pictures in
> those objects. This way the slide object act as a kind of template for
> your screen layout. I guess you would like to use transparent text
> objects on top of the arrow images. Defining en empty text string will
> make sure the arrow below the text object will be visible. You
> probably also have to define an empty dummy picture in case you would
> like to draw text without an arrow in the background.
>
> However, things might be a bit more complicated if the different
> objects have different onset times or durations, but this mechanism
> should also be usable in more complicated cases.
>
> And regarding to the nested lists: perhaps you could start with a
> minimalistic setup without nested list. Then, when everything works
> fine, you could move some of the attributes to separate lists when
> required.
>
> best
> Paul
>
> PS. I'm not sure if reaction time is critical in you study, but keep
> in mind that most displays draw the image from top to bottom. This can
> take upto 10-20ms, so be careful when comparing RT's between
> top-bottom conditions.

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