including stimuli that only appears in half trials, randomly

[Bjørn Sætrevik]

Hi,

There are probably a number of ways you could solve this, but I guess
an easy fix would be like this:

Have a list that contains all the 40 words you want to present. This
list can run randomly or sequential according to your design demands.
For each level of this list, have a procedure that presents the word,
then contains a list with three levels, and make this list run
sequentially: the first level should run procedure A and have a weight
of six, the second level should run procedure B and have a a weight of
one, and the third level should run procedure A and have a weight of
six. Procedure A should record a single response to the presented
word. Procedure B should contain a list with two levels (selected
randomly): One level does nothing, while the other level asks your
question about strategy.

If the explanation is a bit hard to follow, I can email you a mock-up
of the programmed design.

Kind regards,
Bjørn Sætrevik

On Jul 25, 6:13 pm, signy <fluencyst... at gmail.com> wrote:
> Hi,
> I am trying to figure out how to present a stimuli (and record data)
> that appears on only 1/2 the trials of the experiment?
> Specifically, I am planning on presenting a word to which participants
> have to make 12 responses (key presses). A participant will do this
> for 40 different words, but for 20 of them (picked randomly), I would
> like for them to respond to an additional stimuli that is presented
> mid-way through their 12 responses?
> Visually,
> [item]
> resp1
> resp2
> resp3
> resp4
> resp5
> resp6
>           <-- here, for half the trials, participants will be
> presented with another screen/stim asking
>                about their strategy of the 6 responses.
> resp7
> resp8
> resp9
> resp10
> resp11
> resp12
>
> Any ideas on how to do this?
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