key press/release & RT

Tue Nov 6 18:05:22 UTC 2012

Michiel, thanks for your input. I had not considered the time it would take 
to write things. I will look into this.

On Tuesday, November 6, 2012 6:19:03 AM UTC-5, Michiel Sovijärvi-Spapé 
wrote:
>
> Hi, 
> Just to add, that depends on whatever she means with "basic text" - I'd 
> agree with you that normally, you'd think this is a textdisplay, but what 
> if 
> she meant "some text displayed using e-basic"? In other words, canvas, 
> right? 
> Generally, the point is that the vertical sync is messed up if you'd just 
> say 
> 10 c.setattrib textonsettime, clock.read 
> 20 write text to canvas 
> Because it can take long and short to write things actually to the screen 
> (also depending on how much you put there). Now, there's two tricks: 
> 1) Display.waitforverticalblank makes sure you have the synchronisation 
> working (i.e. things aren't appearing halfway) 
> 2) use a second canvas first to write everything to, then copy this canvas 
> to the active display. The first bit (writing stuff) takes much longer 
> than 
> just copying the already made pictures. 
>
> Does that help? All in all, once upon a time, I loved doing everything in 
> canvas things, but nowadays (perhaps with less time on my hands), I have 
> as 
> a rule of thumb: if it CAN be done without code, then do that instead; if 
> it 
> CAN'T be done without LOTS OF code, there might be better software around 
> for the purposes. I think this is also a pretty good rule for those with 
> questions regarding dragging and dropping and whatnot. 
> Best, 
>
> Michiel 
>
> -----Original Message----- 
> From: e-p... at googlegroups.com <javascript:> [mailto:
> e-p... at googlegroups.com <javascript:>] On Behalf 
> Of David McFarlane 
> Sent: 02 November 2012 22:57 
> To: e-p... at googlegroups.com <javascript:>; e-p... at googlegroups.com<javascript:> 
> Subject: Re: key press/release & RT 
>
> 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.pstne 
> t.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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