eprime timing issues and wierd time log

Wed Jun 25 13:09:59 UTC 2014

Well, just to make sure we are talking about the same thing: I assumed you
have the following consecutive objects on the trial procedure:

...
RatingSlide
Inline (with long processing loop)
Fixation
...

You can keep the configuration of the Fixation object as required. I.e.,
just specify the duration using the bracketed attribute name ([time1]).
Pre-release can be set to default ('same as duration'). The rating Slide
should have duration of 5 seconds and pre-release set to 'same as
duration'. So, assuming that the allowed response time for the rating is 5
seconds, this should be OK and there is no need to use *CustomOnsetTime *and
cousins.

The timing mode can be set to event or cumulative. I'm always a bit in
doubt if fMRI tasks are synchronized using cumulative timing. For event
related designs it's probably not required, unless you would like to make
sure that an EPI is made at a very specific point in the BOLD response. In
most cases it's sufficient to use the (relative) onset times of the edat
files in the fMRI analysis. For block designs you could consider
re-synchronization at the start of each block using the trigger signal of
the scanner. Although I prefer to use a small piece of script at the end of
a block instead, to make sure that any errors are compensated for. But
there is no harm done when the cumulative mode is used, as long as you make
sure to check the timed log results.

Best,
Paul

On 25 June 2014 12:18, sunnygu <gusunny1 at gmail.com> wrote:

> 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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