Sound onset and response time issues

[Zilong Xie]

Hi David,
  Thanks for the detailed response!

Best,
Zilong


On Tue, Aug 19, 2014 at 11:06 AM, David McFarlane <mcfarla9 at msu.edu> wrote:

> Zilong,
>
> 1) First and foremost, please thoroughly study the "Critical Timing"
> chapter in the User's Guide that came with E-Prime.
>
> 2) The RT is relative to the OnsetTime of the E-Object that plays the
> sound, e.g.,
>     StimSlide.RT = StimSlide.RTTime - StimSlide.OnsetTime
> (do not take my word for that, please look for yourself).  Note that the
> audio hardware may impose additional delays so that actual onset of sound
> lags even further behind OnsetTime, to test this you would need additional
> equipment (e.g., oscilloscope or Black Box Toolkit).
>
> 3) Yes, you should be able to trust the RT values even with large
> OnsetDelay values.  But you do well to verify this yourself with external
> testing equipment as mentioned above.
>
> Finally, look at https://groups.google.com/d/topic/e-prime/OeiZ00V9SRc
> for a discussion of the various time audit measures.
>
> Best,
> -----
> David McFarlane
> E-Prime training online:  http://psychology.msu.edu/
> Workshops_Courses/eprime.aspx
> Twitter:  @EPrimeMaster (https://twitter.com/EPrimeMaster)
>
> /----
> Stock reminder:  1) I do not work for PST.  2) You may reach PST's trained
> staff (and other support facilities) at https://support.pstnet.com .  3)
> If you do get an answer from PST staff, please extend the courtesy of
> posting their reply back here for the sake of others.
> \----
>
>
>
> At 8/14/2014 03:34 PM Thursday, Zilong Xie wrote:
>
>      Hi E-Prime experts,
>>      In my experiment, in each trial, I presented a sound and
>> simultaneously collected response to the sound with the slide object. When
>> I checked the edat2 file, I noticed that there was onset delay of about 100
>> ms (the time scale in the edat2 file is ms, right?) in the slide object. So
>> my questions are:
>>    (1) How can I reduce the onset delay of the slide object?
>>    (2) Is the RT recorded here relative to the actual onset of the sound
>> or the expected onset of the sound?
>>    (3) In the case of large onset delay, can I trust the RT values
>> reported in the edat2 file? And how can I get the actual RT values?
>>
>>   Thanks!
>>
>> best,
>> Zilong
>>
>
> --
> You received this message because you are subscribed to a topic in the
> Google Groups "E-Prime" group.
> To unsubscribe from this topic, visit https://groups.google.com/d/
> topic/e-prime/5PGPRnXBl3w/unsubscribe.
> To unsubscribe from this group and all its topics, 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/53f3761e.4937320a.5adb.6773SMTPIN_
> ADDED_MISSING%40gmr-mx.google.com.
>
> For more options, visit https://groups.google.com/d/optout.
>



-- 
Zi-Long Xie (谢子龙)

SoundBrain Lab,
Department of Communication Sciences & Disorders,
College of Communication, The University of Texas at Austin
Austin, Texas 78712

Phone:1-(512)550-8521
Email: xzilong at gmail.com

-- 
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/CANQbNb38KSbJTTmRRYPNaaD%2BFUjPbSj8pAoNfCg50LKy-s-xyA%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listserv.linguistlist.org/pipermail/eprime/attachments/20140821/ade90adf/attachment.htm>