Auditory Recording and Onset timing
Stuart Quirk
stuart.quirk at gmail.com
Mon Sep 8 21:41:23 UTC 2014
Thanks David,
After playing around some more I think I have to stick with a fixed time
for trial display and buffer.
One problem is that people vary a fair bit in how long they take to answer
each trial so setting the
soundin for x amount of fixed buffer time gets problematic when a trial
finishes and the next one
starts before the buffer time is completed. It seems that, in this case,
the 'extra' time is a problem for
starting the next trial-- e.g., I set the buffer to 3500msec, the vocal
answer at 1500msec works to trigger
the end of the trial, a 1000msec 'get ready' object follows but there is
still a second left in the buffer as the
next trial begins. So to set the buffer time at any specified value seems
to set the required duration of the
trial so I'll probably just stick with being consistent.
I hoped I could have the soundin continue via some 'infinite' duration
until the termination trigger setting plus 300msec or
something similar so the vocal trigger gives me logged reaction time and
the verbal answer is also captured but
I don't think I can have a flexible recording buffer time + a set time
window post termination of the object.
I played a bit before giving up and it seemed that soundin recording
terminated at the end of a trial even if
the buffer was set to have extra time (an effect I found with just adding
the soundin to the standard/provided
RTime sample experiment).
thanks again!
Stuart
On Thursday, September 4, 2014 4:03:16 PM UTC-4, McFarlane, David wrote:
>
> Stuart,
>
> First, to update this thread a little, various sites (including PST)
> have tried to split one microphone for use for both RT and recording,
> and have not gotten this to work adequately. So as you have done, it
> is still best to use two separate microphones, one for RT voice key,
> and another for voice recording.
>
> Now, just a couple of thoughts offhand, I have not tested this (I
> will leave that to you :) ) ...
>
> First, are you sure that ending the trial after the vocal trigger
> also stops the sound recording? Back when I tested sound recording
> (using EP2.0.8.90), I found that sound recordings always went on for
> the full duration of Buffer Size, regardless of anything else that
> happened. Did I miss something? If you find different behavior,
> perhaps you could make a minimal example program and send that to me
> (off the list).
>
> Even so, I imagine that you still want E-Prime to hold up for a set
> time after each vocal RT and then move on. In that case, and
> assuming that recording does continue after termination of the Slide
> or SoundIn object, what about just using a Wait object after your
> stimulus object. E.g.,
>
> - TrialProc
> - FixText
> - StimSlide ' includes SlideSoundIn for recording, and
> terminates
> ' upon vocal RT
> - RecordingWait ' extra time to wait after StimSlide terminates
> - TrialEndText
>
> -----
> David McFarlane
> E-Prime training
> online: http://psychology.msu.edu/Workshops_Courses/eprime.aspx
> Twitter: @EPrimeMaster (https://twitter.com/EPrimeMaster)
>
> /----
> Stock reminder: 1) I do not work for PST. 2) You may reach PST's
> trained staff (and other support facilities) at
> https://support.pstnet.com . 3) If you do get an answer from PST
> staff, please extend the courtesy of posting their reply back here
> for the sake of others.
> \----
>
>
> At 9/4/2014 10:31 AM Thursday, Stuart Quirk wrote:
> >Thanks David for the many helpful posts I have read from you and
> >others on this group. Very kind of you and others to lend your expertise!
> >
> >I have a question related to this topic--
> >I have separate mics for SRBOX (for RT data collection) and for line
> >in recording of actual answers (for offline accuracy coding).
> >
> >My question is: Is there a way to set up my trials so that the RT
> >trigger ends the trial *after* a delay (long enough to capture the
> >vocal answers)?
> >That is, ending the trial after the vocal trigger would obviously
> >stop the inline recording as well.
> >I have currently fixed the duration of each trial and simply log the RT.
> >This works fine but if I could link trial length to RT (plus 300msec
> >or so) I could shave a lot of time off my overall study.
> >
> >thanks!
> >Stuart Quirk
> >
> >On Monday, March 4, 2013 4:32:04 PM UTC-5, McFarlane, David wrote:
> >Relevant to this
> >issue:
> ><http://docs.psychtoolbox.org/InitializePsychSound>
> http://docs.psychtoolbox.org/InitializePsychSound
> >.
> >
> >-- David McFarlane
> >
> >
> >At 3/4/2013 02:31 PM Monday, David McFarlane wrote:
> > >Sylvain,
> > >
> > >I don't know that anyone has explored sound recording latency
> > >before, so thanks for doing that and posting your observation. I
> > >wonder if this is a limitation of E-Prime in particular, or a
> > >limitation of computer sound recording in general? If the latter,
> > >it will dash the hopes of people who want to measure RT directly by
> > >sound recording (e.g.,
> > <https://groups.google.com/d/topic/e-prime/1kiOTrj3huk>
> https://groups.google.com/d/topic/e-prime/1kiOTrj3huk
> > ).
> > >
> > >Please ask PST Web Support about this at
> > ><http://support.pstnet.com/e%2Dprime/support/login.asp>http://suppo
> > rt.pstnet.com/e%2Dprime/support/login.asp , and post
> > >back here with their response. And I will bring this up with the
> > >PsychoPy folks (in fact, I have been asked to explore this very
> > >issue with one of their top developers this week).
> > >
> > >-- David McFarlane
> > >
> > >
> > >At 3/2/2013 03:54 AM Saturday, Sylvain wrote:
> > >>Hello,
> > >>
> > >>I'm trying to do the same thing with EP2 and a Slide with:
> > >>- a Slidetext sub-object disappearing at the vocal answer of the
> > >>participant. The microphone for this one is plugged to the SRSBox.
> > >>- a SlideSoundIn sub-object recording 1000 of the answer from the
> > >>onset of the slide. The microphone for this one is plugged to the
> > computer.
> > >>
> > >>
> > >>I tried that on two different computers: on the first one I had
> > >>almost the same RT recorded by the SRSBox and after processing of
> > >>the wav file to check for onset. On the second on the RT recorded
> > >>by the SRSBox is 50-100 ms too early compared to the signal I know
> > >>that it's better to check every wav file (that's what I'm going to
> > >>do), but such a delay make me wonder if both objects of the slide
> > >>are starting at the same time on the second computer. Or if there
> > >>wouldn't be a kind a "wake up" time for the SlideSoundIn?
> > >>
> > >>Sylvain
> > >>
> > >>
> > >>On Thursday, April 30, 2009 11:17:38 PM UTC+2, David McFarlane wrote:
> > >>First, you will need EP2 to record audio at all. Next, what if you
> > >>used any ordinary stim/response object to wait for and capture the
> > >>onset of vocalization via, e.g., a SRBox, and follow that with a
> > >>SoundIn object that will then record the remainder of the
> > >>response? You might even split a single microphone between the SRBox
> > >>(for vocalization onset) and the mic input of the computer sound card
> > >>(for recording SoundIn). I will be interested to learn how this
> > works out.
> > >>
> > >>-- David McFarlane, Professional Faultfinder
> > >>
> > >> >If I want to record the timing of the onset of a vocalization but I
> > >> >also want an auditory recording of the verbal response is there any
> > >> >combination of e-prime software/hardware that can do this? In
> looking
> > >> >over the response box features, I found that it will time the onset
> of
> > >> >a vocalization but seems like you need a seperate recording system
> to
> > >> >capture the actual verbatim response. Can you pair the e-prime
> > >> >software and the response box in anyway to capture both at the same
> > >> >time?
> > >> >
> > >> >I hope this makes sense :)
> > >> >
> > >> >Thanks!
>
>
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