key press/release & RT
Courtney Griffin
ianajcxcx at gmail.com
Tue Nov 6 18:03:02 UTC 2012
David, as always, thank you for your helpful suggestions. I will look more
into this.
On Friday, November 2, 2012 4:57:38 PM UTC-4, McFarlane, David wrote:
>
> Please do not use Clock.Read to get the starting time of your
> stimulus, this will almost never be exact, and is in any case
> superfluous. Suppose your text stimulus is named StimText. Then
> StimText.OnsetTime already tells you the onset time of the stimulus,
> you should use that (see
>
> http://groups.google.com/group/e-prime/browse_thread/thread/39e899d3457d4917).
>
> If you think further, you might not even need to do that. If you
> have StimText start after the key is pressed down, and have StimText
> launch its own "release" input mask, then StimText.RT will already be
> the appropriate RT for the release response relative to the onset of
> StimText.
>
> -----
> David McFarlane
> E-Prime training
> online: http://psychology.msu.edu/Workshops_Courses/eprime.aspx
> Twitter: @EPrimeMaster (https://twitter.com/EPrimeMaster)
>
>
>
>
> At 11/2/2012 01:24 PM Friday, Courtney Griffin wrote:
> >David, thank you so much for your help. I was able to read through
> >the Help section and get an idea of how to accomplish what I wanted.
> >
> >Would you happen to know how to use the Clock.Read function to start
> >as soon as the stimulus is presented (I'm using basic text as my
> stimulus)?
> >
> >On Tuesday, October 30, 2012 4:19:40 PM UTC-4, McFarlane, David wrote:
> >Don't know about specifics in this case, just a couple hints for
> >now. Take a look at the "{key} nomenclature" topic in the E-Basic
> >Help facility for hints on how to get RTs using key releases with
> >ordinary stimulus objects. That might get you most of the way, and
> >if needed you could supplement this with some simple computations in
> >inline code.
> >
> >-----
> >David McFarlane
> >E-Prime training
> >online:
> ><http://psychology.msu.edu/Workshops_Courses/eprime.aspx>
> http://psychology.msu.edu/Workshops_Courses/eprime.aspx
> >
> >Twitter: @EPrimeMaster
> >(<https://twitter.com/EPrimeMaster>https://twitter.com/EPrimeMaster)
> >
> >/----
> >Stock reminder: 1) I do not work for PST. 2) PST's trained staff
> >take any and all questions at
> ><http://support.pstnet.com/e%2Dprime/support/login.asp>
> 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) In addition, PST takes questions at their Facebook page
> >(<
> http://www.facebook.com/pages/Psychology-Software-Tools-Inc/241802160683>
> http://www.facebook.com/pages/Psychology-Software-Tools-Inc/241802160683
> >
> >), and offers several instructional videos there and on their YouTube
> >channel
> >(<http://www.youtube.com/user/PSTNET>http://www.youtube.com/user/PSTNET
> >) (no Twitter feed yet,
> >though). 4) 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 10/30/2012 04:08 PM Tuesday, Courtney Griffin wrote:
> > >basically I want it to go something like this:
> > >
> > >at stimulus display, read the clock and get the time (will name this
> > >variable T1)
> > >after key release, read the clock and get that time (will name this
> > >variable T2)
> > >at key press (final response), read the clock and get that time
> > >(will name variable T3)
> > >
> > >RT (reaction time) = T2-T1
> > >MT (movement time) = T3-T1
> > >
> > >
> > >On Tuesday, October 30, 2012 2:26:31 PM UTC-4, Courtney Griffin wrote:
> > >Hello all,
> > >
> > >I am programming my first experiment with E-Prime and have run into
> > >some issues I was hoping that someone might be able to help with.
> > >For my experiment I will be having subjects simultaneously hold down
> > >two keys (u and o), a stimulus is presented and they are to respond
> > >to it by releasing one of the two keys and making a movement to
> > >another to respond ({TAB} or {END}). Additionally, I would also like
> > >to record movement time (time from release of key to response) and
> > >reaction time (time of release of one of the initial keys). So far I
> > >have already gone in and allowed both Key Presses and Releases. My
> > >issue is actually how to get the program to recognize the release of
> > >the key and start recording the time, so I decided to use the
> > >Clock.Read function, but I'm not sure exactly how to implement it.
> > >Any assistance with this would be TRULY appreciated. Here is a bit
> > >of the code I have come up with, but I know that I am probably
> > >nowhere near where I need to be:
> > >
> > >Dim kbState As Integer
> > >
> > >Do
> > >
> > >If Keyboard.GetKeyState("u") = ebStatePress And _
> > >Keyboard.GetKeyState("o") = ebStatePress Then
> > >
> > >If kbState = Keyboard.GetKeyState ("{END}")= 0 Then
> > >Clock.Read
> > >
> > >ElseIf kbState = Keyboard.GetKeyState ("{TAB}") = 1 Then
> > >Clock.Read - Stimulus.OnsetTime
> >
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