eprime timing issues and wierd time log

Wed Jun 25 10:18:14 UTC 2014

Hi,Paul. So you mean if I want the fixation after the 5s rating to be presented as long as I defined, I should set the duration before the rating and prerelease to same as duration.
Besides, my rating slice time is fixed to 5s, so I suppose this would work. 
I just tried following: I originally set the fixation as accumulative mode which is required in fMRI and I changed this to event mode which make the fixation last as long as I want. How do you think about this?
By the way, I usually add an attribution in list which tells the fixation duration, but now I defined the duration in fixation property file using[time1] which time1 is the property name in list. Are these two ways the same? Sometimes I find I can't trust the codes in eprime very much. Which would you suggest?

Thanks a lot for your kind reply.
My best,
Sally
发自我的 iPhone

> 在 2014年6月25日，下午3:51，Paul Groot <pfc.groot at gmail.com> 写道：
> 
> Hi Sally,
> 
> You could solve this by setting the duration of the object before the inline to the required value (5 sec), and set pre-release to 'same as duration'. This will make sure that the inline is executed a.s.a.p. and that the next object is scheduled to start after 5 seconds. However, this would not work if the time taken by the inline is variable. In that case you might try using the CustomOnset/OffsetTime properties and set the timing mode to custom (of the object after the inline ). 
> 
> 
> Paul
> 
> 
>> On 25 June 2014 02:01, sunnygu <gusunny1 at gmail.com> wrote:
>> 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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> 
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