Please help with my paradigm

[Sukru Baris Demiral]

hi,
i am not sure but i think there is a way to do it:
You can give an attribute value for each picture: attribute named like
"No". From 1 to 60.
Then you can write a small code to generate a random number between
1 to 60. And then, you write in the code: if this number is the value of
one of the "No" attributes of the pictures, then skip this member of
the list.
I think there must be a code to generate random number,
but i am not sure for the second part; how to make the skip.
If there is another suggestion i'd be glad to know.

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_)   _         What I wanted to do was
=   :*_0     a little bit psycomputing!
=  _`\<,_
=_(*)/_(*)__________...|o>..___..|1>...___|oo11>

                                           Baris

On 16 Aug 2002, Anthony Haywood wrote:

> Dear all,
>
> As a new member of this forum, I am not entirely sure that I am posting this in the right place but, here goes...
>
> I am writing a paradigm to present the Mackworth clock task to a number of subjects. The paradigm itself consists of a circle of 59 grey dots and one white dot. The white dot moves around the circle, clockwise, as the second had on a clock would do, moving once per second.
>
> The task is designed upon 60 pictures which are shown in sequence, ie picture one is the white dot at 0, I then rotated the picture 6 degrees and saved this as picture 2 and so on.
>
> What I need to do is present the pictures in sequence but I want to radomly 'skip' one number so on occasion the 'second-hand' skips a notch anbd moves 12 degrees. I am unsure how to do this and any help would be greatly appreciated.
>
> Many thanks in anticipation.
>
> Anthony Haywood
> Neurophysiologist
>
>
>