eprime timing issues and wierd time log

[sunnygu]

Hi,Paul, yes, I used a loop to make sure the rating lasted for 5s . And I tried to change the following fixation mode to event then the time of the fixation is ok then. But do you have any better idea about this situation? 
Thanks for your nice reply.

Sally

发自我的 iPhone

> 在 2014年6月25日，上午6:09，Paul Groot <pfc.groot at gmail.com> 写道：
> 
> 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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