SRBOX speech input trigger

[Michiel Spape]

Hiya,
The great benefit of the SRBOX as an inputdevice in E-Prime is that it is really nicely integrated into E-Prime. As such, of course you *can* try to poll it every once in a while, but the recommended way of dealing with these things is:

1.       Given that you have a stimulus, have some textdisplay with inputobject SRBOX.

2.       Send the trigger (inline aplenty around this group) as soon as input on voicekey is received, which terminates the object. Something like offset trigger enable? I can't remember from the top of my head.

3.       Continue, if you must, the stimulus.
I imagine that you want to keep showing the stimulus even though voicekey input has been received so that merely the trigger is send but your (EEG?) data is not disrupted by offsets of stimuli, correct? In that case, I tend to find it easiest just to do either one of two things:

-          Have a 'hidden' object which has a long time limit (but 0 ms shown), which terminates if voicekey input has been received (so just add the SRBOX as input device there).

-          Show a stimulus that looks exactly like the stimulus to which people respond *after* that one. I.e., just a copy, with length desired-stimulus-length minus duration of preceding stimulus. That way, you can do all sorts of stuff in between presentation and the participant should never notice.

Finally, a word of caution: always see if you can get the voicekey/srbox to work in the simplest of setups: just one display with infinite duration, terminates only with SRBOX button input. If that doesn't work, the SRBOX is probably incorrectly configured. If it does, continue with voicekey input. If that immediately, as you say, triggers the voicekey, see if the sensitivity is correct. Only after doing all this, I would continue making the real experiment.
Best,
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 Baris Demiral
Sent: 28 June 2011 07:59
To: e-prime at googlegroups.com
Subject: SRBOX speech input trigger

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

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SB Demiral, PhD.
Department of Psychology
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