wait to collect response

[David McFarlane]

Matt,

Hmm, so if the subject is "trigger-happy" and 
submits any responses before the 4800 ms mark, 
you want the program to ignore those and accept 
only their first response past the 4800 ms 
mark?  E.g., it's OK if the subject responds once 
a second over the first 4800 ms (i.e., four 
times) and then responds once more after the 4800 
ms mark, and the program accepts only the fifth response?

I had misread your earlier post and thought that 
you meant to collect one response only any time 
during the playback of the sound (e.g., any time 
during the full 5500 ms), while making sure that 
the sound played through at least 4800 ms and 
thereafter terminated upon any response 
(including any response detected earlier), and 
was prepared to write up solutions for that 
situation (all involving some degree of inline 
code).  But if you really mean to ignore 
premature responses, then, for the record, you 
don't really need the initial TextDisplay nor the 
intervening Wait object.  You could accomplish 
the same end simply with something like

StimSound
RespWait

where StimSound presents the sound with Duration 
of, e.g., 4800 (or, if this varies from stimulus 
to stimulus, set using an an attribute reference) 
and Stop After = No, and RespWait is a Wait 
object with Duration and input mask set as needed 
to collect the response made after the 4800 ms mark.

-- David McFarlane, Professional Faultfinder


>Hey Mich, Thanks for the input.
>
>I was actually able to remedy this by using a couple of different
>objects.
>First, I have a TextDisplay, duration  = 0
>Then, the SoundOut object, duration = 0 and stop after is set to no.
>After that I have a wait object duration set to 4800ms.
>Lastly, I have another TextDisplay to collect the response made at the
>4800 mark.
>It seems to work out pretty slick.
>
>Thanks again,
>
>Matt
>
>
>On Oct 28, 3:41 am, Michiel Spape <Michiel.Sp... at nottingham.ac.uk>
>wrote:
> > Hi,
> > If I'm understanding all of this correctly, I 
> think the simplest way to do this would be to 
> disconnect the audio stimulus and the event at 4800.
> > i.e.:
> > 0 ms: Sound starts playing 
> (SoundBuffer.Play). Also, log onset of sound 
> (e.g. c.SetAttrib "SoundOnsetTime", Clock.read)
> > [no response capturing]
> > 4800 ms: some kind of marker (say, an 
> invisible TextDisplay1) end action to terminate
> > Between 4800 and 5500 ms: at termination of TextDisplay1:
> > If TextDisplay1.RESP <> "" then
> >         SoundBuffer.Stop 'kills sound
> >         c.SetAttrib "RT", TextDisplay.RTTime 
> - c.GetAttrib("SoundOnsetTime") 'saves RT based on soundbuffer onset time.
> > end If
> >
> > So, in essence, I'd say that the easiest way 
> to "hold off on collecting a response" would, 
> essentially, be NOT to collect a response before the time.
> > Best,
> > Mich
> >
> > Michiel Spapé
> > Research Fellow
> > Perception & Action group
> > University of Nottingham
> > School of Psychologywww.cognitology.eu
> >
> >
> >
> > -----Original Message-----
> > From: e-prime at googlegroups.com 
> [mailto:e-prime at googlegroups.com] On Behalf Of Matt Paffel
> > Sent: 27 October 2010 17:06
> > To: E-Prime
> > Subject: wait to collect response
> >
> > Hello,
> >
> > I have an experiment that runs some audio files and I'm having an
> > issue somewhat similar to what was discussed in this post:
> >
> > http://groups.google.com/group/e-prime/browse_thread/thread/9d6274c8e...
> >
> > The experiment that I have runs audio files that are approximately
> > 5500ms in length and the event that a participant needs to respond to
> > occurs at 4800ms. I wrote some script to adjust the real reaction time
> > from the RT of the object which works fine.
> >
> > I also have the audio object set to terminate after a participant has
> > made a response thus moving them to the next trial.
> >
> > The issue with the program is that if a participant responds prior to
> > the 4800 mark, the program jumps to the next trial. Turning the
> > objects  end action to "none" doesn't help because if a participant
> > responds prior to the 4800 mark, the RT collected is not for the event
> > under study.
> >
> > My question is, is there a way to hold off on collecting a response
> > for an allotted amount of time to an object?

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