eprime timing issues and wierd time log

[Paul Groot]

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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