SRBOX speech input trigger

[David McFarlane]

Baris,

Stock reminder:  1) I do not work for PST.  2) PST's trained staff 
takes any and all questions at 
http://support.pstnet.com/e%2Dprime/support/login.asp , and they 
strive to respond to all requests in 24-48 hours -- this is pretty 
much their substitute for proper documentation, so make full use of 
it.  3) If you do get an answer from PST Web Support, please extend 
the courtesy of posting their reply back here for the sake of others.

That said, here is my take...

You have three issues mixed together here:

1) Sending a signal to external equipment following a response.

2) Using the SRBox for a response.

3) Using the SRBox as a voicekey.

I like to think that you have sorted 2 & 3; if not, first heed Mich's 
advice to start small and work up from there.  OTOH I am puzzled by 
your statement that "it writes the onset time of the speech as 
'0'".  That makes no sense.  Onset times are in ms from the start of 
the session, so it is completely impossible to get onset times of 
0.  Perhaps you meant something else?

But on to issue 1.  By "we have an e-prime object waiting for the 
speech input from SRBOX" do you mean that your stimulus object (let's 
call it StimSlide) has a Duration of (infinite) and End Action 
Terminate (i.e., a self-paced stimulus terminated only by voice 
response)?  And you want to send the same signal to your external 
device whenever the subject responds?  If so, you might use the 
OnsetSignal... and OffsetSignal... properties.  I would set this up 
using inline code at the start of the program, something like

Const  Lpt1Port as Integer = &h0378  ' adjust to match your system
Const  RespSignal as Integer = &hFF  ' adjust for your signal

StimSlide.OnsetSignalPort = Lpt1Port
StimSlide.OnsetSignalData = 0  ' reset output at start of stimulus
StimSlide.OnsetSignalEnabled = True
StimSlide.OffsetSignalPort = Lpt1Port
StimSlide.OffsetSignalData = RespSignal
StimSlide.OffsetSignalEnabled = True

You can learn more about these properties by looking up the 
appropriate topics in the E-Basic Help facility.  StimSlide will now 
send the RespSignal at its offset, which happens as soon as it gets a 
response.  Note that I set OnsetSignalData to 0 -- RespSignal stays 
on the output port until something else replaces it, here I use the 
OnsetSignal to reset the port, you could also use other means.

But suppose your stimulus has a time limit, so that it might 
terminate without a response, and you want a signal only in the case 
of a response.  In that case you might skip all the 
Onset/OffsetSignal... stuff above, and do something like the 
following in inline code right after your stimulus:

Const  Lpt1Port as Integer = &h0378  ' adjust to match your system
Const  RespSignal as Integer = &hFF  ' adjust for your signal
Const  SignalDur as Long = 10
If (StimSlide.RT > 0) Then
     WritePort Lpt1Port, RespSignal
     Sleep SignalDur
     WritePort Lpt1Port, 0  ' reset output
End If

(This uses .RT to detect a response, for other options see my 
comments at 
http://groups.google.com/group/e-prime/browse_thread/thread/5e712b8b726ea0de/798ed4c44b6c44e3 
.)

For more discussion on this, and a solution to a more complex 
scenario (sending signal at time of response while letting the 
stimulus continue its Duration), see threads at 
http://groups.google.com/group/e-prime/browse_thread/thread/abec5564c65de738 
and 
http://groups.google.com/group/e-prime/browse_thread/thread/cfc3d0307d5c7fbd 
(which you could have found by doing a search using terms like "OnsetSignal").

-- David McFarlane, Professional Faultfinder
"For a successful technology, reality must take precedence over 
public relations, for nature cannot be fooled."  (Richard Feynman, 
Nobel prize-winning physicist)


>Dear E-prime users,
>
>In our script, we have an e-prime object waiting for the speech 
>input from SRBOX (with input key defined as "6"). We want to write 
>an inline code (without jump) to make it possible to send a trigger 
>as soon as the speech input is recognized. We do not want to use 
>jump , becasue after this object there are things which should be 
>executed. How do we write an inline script call like "If 
>SRBOX.activated=TRUE, then WritePort.. " kind of description?
>
>Also, in our tests, eventhough we increased the sensitivity of the 
>SRBOX for speech input it writes the onset time of the speech as 
>"0", I wonder there is something that we are missing...any suggestions?
>
>Thank you for your help in advance,
>Baris
>
>--
>SB Demiral, PhD.
>Department of Psychology
>7 George Square
>The University of Edinburgh
>Edinburgh, EH8 9JZ
>UK
>Phone: +44 (0131) 6503063

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