eprime capabilities

[David McFarlane]

Merry,

I had pretty much the same reaction as did Mich 
to your question.  EP can readily present your 
visual and auditory stimuli and present feedback, 
and might even collect the subjects' responses 
(EP2 can even record subjects' vocalizations into 
.wav files).  But by "have the computer judge ... 
whether they correctly used weak-strong (WS) or 
strong-weak (SW) stress" do I correctly 
understand that you wish EP to do real-time vocal 
recognition & analysis?  That *is* a tall 
order!  Do you know of any other current software 
or hardware that can not only recognize WS vs. SW 
stress, but do so reliably enough to pass 
scientific muster?  Or is that what the PVI does, 
based merely on the raw sound-pressure waveforms?

To be sure, in principle EP might well be 
*capable* of "judging" WS vs. SW stress, but it 
would pose a formidable programming challenge and so would not be *practical*.

But perhaps I misunderstand and you have something simpler in mind.

-- David McFarlane, Professional Faultfinder


At 12/9/2010 07:27 AM Thursday, Michiel Spape wrote:
>Hi,
>What exactly do you wish E-Prime to calculate? 
>“whether they correctly used weak-strong (WS) or 
>strong-weak (SW) stress (this could be 
>calculated using a pairwise variability index 
>(PVI) - a positive PVI would indicate SW, and a 
>negative PVI would indicate weak-strong stress)” 
>would mean that the computer A) records vocal 
>responses (possible in E-Prime), B) that vocal 
>responses are classified as WS/SW, right? I’d 
>imagine if you would do the test semi-automatic 
>- let e-prime record responses and so on, and 
>then have the experimenter classify the words 
>immediately after the participant says them (I 
>mean, after every trial, for instance), this 
>would be possible. If you wish to know whether 
>E-Prime can do any sort of higher-order 
>analysis, the answer is no (unless you are 
>REALLY REALLY good with programming, in which 
>case you could do the same with much more ease 
>in .NET, c#, Matlab, etc). It cannot do signal 
>analysis at all (therefore no acoustic analysis 
>either), nor is it (I imagine) intended to do such things.
>
>BUT, the semi-automatic way is probably much 
>easier for anyone involved. I mean, the few 
>times I did a Stroop task with vocal responses, 
>I classified the subjects’ responses (tip for 
>those thinking of it: classify the first letter 
>of their literal response (‘g’ if green, for 
>instance), not whether it is correct, or _you_ 
>will have a Stroop effect as well as the 
>subjects!) as well. You will have to endure 
>[number of subjects * boredom involved in task = ] total boredom though.
>
>Hope that helps,
>Mich
>
>
>Michiel Spapé
>Research Fellow
>Perception & Action group
>University of Nottingham
>School of Psychology
>www.cognitology.eu
>
>From: e-prime at googlegroups.com 
>[mailto:e-prime at googlegroups.com] On Behalf Of Merry Ha
>Sent: 09 December 2010 11:32
>To: e-prime at googlegroups.com
>Subject: eprime capabilities
>
>Hi,
>I'm a speech pathology honours student from the 
>University of Sydney working on my project at 
>the moment using e-prime for the first time.  My 
>honours project will be used for children with 
>Childhood Apraxia of Speech (CAS).
>
>We will be presenting novel word stimuli on the 
>screen visually and auditorily, and then have 
>the child to imitate the computer, or read off 
>the screen. Children with CAS tend to say words 
>with equal stress, and the aim of the experiment 
>was to have the computer judge and provide 
>feedback whether they correctly used weak-strong 
>(WS) or strong-weak (SW) stress (this could be 
>calculated using a pairwise variability index 
>(PVI) - a positive PVI would indicate SW, and a 
>negative PVI would indicate weak-strong stress). 
>Do you know if this programming is possible for e-prime?
>
>Merry

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