eprime timing issues and wierd time log

[Paul Groot]

Hi Sally,

Does your inline code use some kind of loop that takes a relative long time
to finish? In that case EPrime probably tries to compensate for the 'lost'
time when executing the next object.

Paul




On 24 June 2014 16:20, sally <gusunny1 at gmail.com> wrote:

> Dear all,
>
> Recently I find there is a strange thing about eprime. I am engaged in an
> fMRI experiment. So there is a strict timing demand and I wrote several
> lines of codes to make it possible in the scanner that subjects use two
> keys to move the cursor in the screen to do rating from 1-9.
> The very obvious problem is that when I run the codes, some presentation
> before the 1-9 ratings has got something like time ceiling. the rating time
> is always fixed as I assigned in the codes,but sometimes, the fixation time
> after the rating is shorten to 0, or sometimes the picture showing time
> after the fixation also flash more quickly than I expected while another
> fixation after the picture is still shown as I hoped. It's  totally out of
> my mind. pictures didn't show up for the time I demand in the duration menu.
> I think this may have something to do wt my rating part. So I'd better to
> write out how I realize this part:
>
> Another guy give me this idea to make the rating 1-9 shown for 0s and
> afterwards every time I press the button I set up in the rating slide to
> left or right move the cursor, the eprime would catch the response and
> check which btton is pressed and make a decision whether the cursor move
> left or right and how long it would move. then after the axis is
> determined, I would draw the rating slide. and I have a cycle to control
> the time by datediff functon to check the start and the end of the cycle is
> about 5s apart.
>
> I hope I make myself clear.
>
> Any idea would be appreciated and hope someone can help me.
>
> My best,
>
> Sally
>
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