Vocal RT without SRBox

[David McFarlane]

As Michiel said already, for E-Prime to get a 
voice RT you need an external voice key device, 
which the SRBox provides.  But if you do not want 
to spend US$450 or more on an SRBox and are handy 
with some light electronics, then you could build 
your own voice key with readily available 
supplies for very little money -- I did this 
myself a couple decades ago using plans from a 
published paper, and I could look that up again 
for anyone interested.  You would also have to 
hook this up through a digital I/O port (e.g., 
parallel port), and make the appropriate adjustments in E-Prime.

FWIW, the folks building PsychoPy plan to add the 
capability to use normal sound input as a voice 
key, but I have no idea when they will get around to that.

-- David McFarlane


At 2/26/2013 08:08 AM Tuesday, Oscar Ferrante wrote:

>Thank you very much for your answer, Michiel!
>
>I use E-Prime 2 and the method that you mention it's the same that I thought.
>I don't know Mat-Lab and neither my professor.
>
>If someone else have other ideas I will glad to read it!
>Il giorno 26/feb/2013 13:55, "Cognitology" 
><<mailto:mspape at cognitology.eu>mspape at cognitology.eu> ha scritto:
>
>Hi,
>
>Please correct me if I’m wrong, anyone, but 
>although there *is* in E-Prime 2 a soundcapture 
>device, with which you can record audio for your 
>experiment, there is no way to use this as an 
>alternative to the SRBox voicekey input.
>
>However, you can still do what you want by using 
>the soundcapture, to save the wave file for each 
>trial (try to save the sound as a trial number 
>or some such so that you know what condition it 
>was in), and then get the reaction time from 
>that. The hard way to do that would be to use 
>any audio editor (I like cool edit, but audacity 
>works), and see when a reaction is given. This 
>is possible but will take a number of hours to 
>work. If you know a little matlab, an 
>alternative would be to do some signal 
>processing and just detect for a threshold, 
>which shouldn’t be too hard (find RT as time(dB > threshold)).
>
>If you only have E-Prime 1, you could just 
>record the whole experiment and have loud sounds as a synchrony marker.
>
>
>
>I’ve noticed before that any voicekey type of 
>experiment requires roughly the same amount of 
>extra time of processing as (duration of 
>experiment) x (number of subjects), though!
>
>
>
>Cheers,
>
>Michiel
>
>
>
>
>
>From: 
><mailto:e-prime at googlegroups.com>e-prime at googlegroups.com 
>[mailto:e-prime at googlegroups.com] On Behalf Of Oscar Ferrante
>Sent: 26. February 2013 13:19
>To: <mailto:e-prime at googlegroups.com>e-prime at googlegroups.com
>Subject: Vocal RT without SRBox
>
>
>
>Hi everyone!
>I'm an Italian student at Università "G. d'Annunzio" of Chieti-Pescara.
>For my thesis, a dual-task experiment, and I 
>need to register the vocal reaction time through a microphone.
>There is the possibility to do this without the SRBox? If yes, how?
>Thanks to everybody will answer!

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