Extended reaction and accuracy

[Maria]

Thanks liwenna for answering.

Of course, if you set the property „Time Limit“ to “same as duration”
of both slides an combine the accuracy of Slide1.acc and Slide2.acc it
works fine. The problem is that we distinguish between “correct
response”, “false response” and “no response” and even with only 2
Slides during the subject can react; there are 9 different
combinations of possible reactions we have to regard (e.g. the subject
could react wrong during Slide1 and try to undo it and press the right
key at slide2…). The more slides where the response can be given, the
more possibilities and if the duration of the slides are variable, it
is not possible (or very complicate) to calculate the accuracy if the
time for reaction should be a fix interval.

The easiest way is to set the property “time limit” of Slide1 longer
than the presentation of Slide1. And it works if you look at the data
of the results-file, the accuracies (Slide1.acc) and given responses
(Slide1.resp) are correct. But if we tried to send a trigger depending
on Slide1.acc, it doesn’t work if the reaction time is longer than the
duration (but in the result file Slide1.acc is correct even if the
reaction time is longer than the duration of Slide1). (Of course, we
took care that we use Slide1.Acc only when the time limit for reaction
is over).

Our hypothesis is that if you use a time limit for reactions longer
than the presentation of a slide (and the reaction is given after the
duration of the slide but during the allowed time for reaction), then
the properties Slide1.acc and Slide1.resp will be set at the end of a
trial into the list. So Slide1.acc is not available during the trial
(and so we can’t use it for sending a trigger). What would help us is
some code that set the properties Slide1.acc and Slide1.resp into the
list before ending a trial or a code that we can use the properties
Slide1.acc and Slide1.resp of the previous trial (then we would sent
the current accuracy during the next trial). And perhaps there is also
a solution we not thought about…

Thanks for any help,
Max


On 10 Feb., 13:27, Maria <maria.richter.m... at googlemail.com> wrote:
> Good morning!
>
> We have the following strange problem:
>
> We sat the "time limit" for reactions (=2000ms) longer than the
> presentation time of the slide1(1000ms) (at which should be reacted
> and which was followed by a slide2 (1000ms)) and asked in a later
> inline
>
> -----------------
>
> if c.getattrib("Slide1.acc") = 1 then
>
> l=3
>
> end if
>
> if c.getattrib("Slide1.acc") = 0 then
>
> l=4
>
> end if
> debug.print l
>
> ---------------------------
>
> In trials, where the reaction time was longer than the presentation
> time of the first slide (reaction during slide2) the "l" was set 4,
> even in correct cases.
>
> We need the accuracyinformation at this point of the experiment to
> send triggers.
>
> Is there anyone who had the same problem before?
> Thanks for any answer, we have no idea...
>
> Best wishes,
>
> Max

-- 
You received this message because you are subscribed to the Google Groups "E-Prime" group.
To post to this group, send email to e-prime at googlegroups.com.
To unsubscribe from this group, send email to e-prime+unsubscribe at googlegroups.com.
For more options, visit this group at http://groups.google.com/group/e-prime?hl=en.