Auditory Recording and Onset timing

Thu Sep 4 14:31:11 UTC 2014

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 
> . 
>
> -- 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 ). 
> > 
> >Please ask PST Web Support about this at 
> >http://support.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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>
>

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