Button releases & Reaction time

[David McFarlane]

CL,

You may also find documentation for this in the 
"{key} nomenclature" topic of the E-Basic Help facility.

-- David McFarlane


At 4/4/2014 06:14 AM Friday, David Vinson wrote:
>Hi CL,
>
>I think you just need to use the {-key} format to detect releases, e.g.
>{-1}{-2}
>for releases of keys 1 and 2, vs
>12
>which indicates presses only.
>
>You might consider enabling the device to detect 
>both presses and releases - having designed a 
>vaguely similar experiment myself I found it 
>useful to detect that a participant had pressed 
>the button before a stimulus onset, and also 
>that no release had occurred during a short 
>interval before that stimulus started.  This 
>way if they pressed but failed to hold a key, it 
>would display an error message and restart the 
>trial.   At least in our design, piloting 
>suggested this happened often enough it was worth the extra work to implement.
>
>all the best,
>DavidV
>
>On 03/04/2014 11:43, Clément Letesson wrote:
>>Hi there,
>>
>>I designed an experiment where participants 
>>have to execute different actions after 
>>watching a video. Participants have to keep 
>>their index fingers pressing two specific 
>>buttons on a response box. I want to record the 
>>reaction time from when the video stops to the 
>>button release but it does not work.
>>
>>I specified that "Button release" was the only 
>>response collection mode but when trying to 
>>apply the configuration to the slide where 
>>participants have to execute the actions, I get 
>>an error message: "value contains presses and 
>>device is not accepting presses" and I do not 
>>really get why this is happening ... It appears 
>>I can not make eprime record the RT's from the button releases.
>>
>>Any insights/advice/explanations ?
>>
>>All the best and thanks in advance,
>>
>>CL
>>--
>
>
>--
>David Vinson, Ph.D.
>ESRC Research Fellow
>Cognitive, Perceptual and Brain Sciences Research Department
>University College London
>26 Bedford Way, London WC1H 0AP
>Tel +44 (0)20 7679 5311  (UCL internal ext. 25311)

-- 
You received this message because you are subscribed to the Google Groups "E-Prime" group.
To unsubscribe from this group and stop receiving emails from it, send an email to e-prime+unsubscribe at googlegroups.com.
To post to this group, send email to e-prime at googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/e-prime/533ec90c.6308320a.2822.314bSMTPIN_ADDED_MISSING%40gmr-mx.google.com.
For more options, visit https://groups.google.com/d/optout.