Flicker

[David McFarlane]

Thanks first for looking through past posts, and for laying out your 
Procedure structure here.  Just a reminder, also make sure to work 
through all the tutorials in the Guides that come with E-Prime.

First, your error message -- that results because .RESP returns a 
String value, and in your Case you compare that to the Integer value 
1.  Strings and Integers are different types, hence the error.  In 
order to make that work, you need a String value for your Case, e.g.,

     Select Case E1b.RESP
     Case "1"  ' i.e., a String consisting of the "1" character
         GoTo Label2
     Case Else
         GoTo Label1
     End Select

But why stop the lesson there?  First, Select Case seems a lot of 
bother for this simple case -- if the subject does not respond then 
the program should loop back, otherwise it should just continue.  You 
could accomplish that with merely

     If (E1b.RESP <> "1") Then Goto Label1

as long as you use the response "1" to indicate that the subject 
detects the change.  But your message says that they press the space 
bar.  In that case, the code should read

     If (E1b.RESP <> "{SPACE}") Then Goto Label1

or, if you set Allowable on E1b to "{SPACE}", you could also use

     If (E1b.RESP = "") Then Goto Label1

or even

     If (E1b.RTTime = 0) Then Goto Label1

or, if you also set Correct to "{SPACE}", then

     If (E1b.ACC = 0) Then Goto Label1

to detect absence of response.

Hope that helps.

-----
David McFarlane
E-Prime training 
online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter:  @EPrimeMaster (https://twitter.com/EPrimeMaster )

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At 11/5/2013 01:34 PM Tuesday, Mateo Leganes Fonteneau wrote:
>Dear all.
>
>I'm a beginner user of E-prime.
>
>I'm trying to implement a flicker task and I'm finding some problems 
>programming the inline object.
>I already consulted all the previous posts regarding this topic and 
>tried different commands to perform this task without success.
>
>The point is to present 4 stimuli in a loop. E1a and E1b present a 
>change, and the loop should continue until the change on E1b is 
>detected and space bar pressed.
>
>
>Label1
>mask1
>E1a
>mask
>E1b
>Inline
>Label2
>Endtask
>
>I placed the Inline item after E1b, I chose a select a SelectCase command:
>
>Select Case E1b.RESP
>    Case 1
>           GoTo Label2
>    Case Else
>  GoTo Label1
>End Select
>
>When running the script an error of typing is shown.
>
>Can someone tell me how to solve this problem?
>I am specifying on E1b which is the input I'm waiting for (Space), 
>that's right?
>
>Thanks a lot.

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