eprime timing issues and wierd time log

[gorgeous yayuan geng]

Hi, Paul.

I have tried again and find that once I set the fixation mode to event the
program went smoothly as I expected  and its duration I defined would not
be shortened. I am a little confused about this part. Do you have an idea?

My best,

Sally


2014-06-25 22:50 GMT+08:00 sunnygu <gusunny1 at gmail.com>:

> Hi, Paul.
>
> I just tried what you said but it didn't work as we expected. First of
> all, I would like make you informed that the rating slide duration is set
> to zero and I use inline scripts to control the whole presentation to be 5
> seconds, each time there is a keyboard response, I would draw the rating
> slice,making it seems its duration is 5 seconds.
>
> Then here is how I revised as you told me: first fixation prerelease set
> to be the same as it's duration, since my eprime version didn't have this
> option, I use the bracketed attribution. Second, I set the rating
> prerelease to be zero or 5 seconds.
> But all turned to be a failure in that the fixation time is shorten.
>
> So I don't know how to revise it.
>
> Hope you can give me some guidance.
> Thanks a lot.
> Best regards,
>
> Sally
>
> 发自我的 iPhone
>
> 在 2014年6月25日，下午9:09，Paul Groot <pfc.groot at gmail.com> 写道：
>
> 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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>>>
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