measuring RT at offset of button press

[Tony Zuccolotto]

James,

The E-Prime 1.x Keyboard device allows you to specify the collection of 
	* Presses
	* Releases
	* Presses and Release

Check out the Devices tab of the Experiment Object and the "{key}
nomenclature" topic in the E-Basic Help, e.g. to accept the press of a
spacebar you would specify {SPACE} as an allowable key, to accept only
the release of the spacebar you would specify {-SPACE}.

Hope this helps,
Tony

Anthony P. Zuccolotto
Vice President of Operations
Psychology Software Tools, Inc.
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Pittsburgh, PA 15221-4610
Phone     412-271-5040
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Email     anthony.zuccolotto at pstnet.com
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> -----Original Message-----
> From: James T. Myers [mailto:lngmyers at ccunix.ccu.edu.tw]
> Sent: Friday, October 25, 2002 1:15 AM
> To: E-Prime List
> Subject: measuring RT at offset of button press
> 
> 
> I would like to measure the time between the onset of a visual display
and
> the OFFSET of a button press.  Specifically, I plan to have sign
language
> signers begin each trial with their hands on the button box or
keyboard,
> and then lift their hands to initiate signing when a visual stimulus
is
> displayed -- a kind of sign-language naming task.  There doesn't seem
to
> be anything built-in in E-Prime to make this easy to do, and I didn't
see
> the relevant E-Basic command either.  I know that keyboards at rest
send a
> "rest" signal whose onset can be detected when a key is no longer
pressed,
> so it should be doable.  Any tips?
> 
> James Myers
> Graduate Institute of Linguistics
> National Chung Cheng University
> Min-Hsiung, Chia-Yi  621
> TAIWAN, ROC
> Email:  lngmyers at ccunix.ccu.edu.tw
> Web:    http://www.ccunix.ccu.edu.tw/~lngmyers/
> Phone:  886-5-242-8251
> Fax:    886-5-272-1654
>