Feedback for anticipation

[David McFarlane]

Mich,

>Without inline, the easiest thing would be to make some kind of 
>nasty spider-web of a programme containing multiple jump labels:
>
>Fixation-->if response jump label1
>Fixation-->no response-->images-->some kind of response-->jump label2
>Procedure:
>Fixation-->Stimuli-->Response-->Label1-->SoundWarning-->Label2-->EndOfTrial

Funny you should mention using multiple overlapping Jump Labels, 
since I just looked into this myself a few weeks ago.  Did you ever 
get that to work yourself?  How?  I found it completely impossible 
for the following reasons:

1) Any one E-Studio object has only one Jump Label that applies to 
all its End Action = Jump input masks; i.e., E-Studio has no 
mechanism for allowing multiple Jump Labels from any one object.

2) To circumvent that, I used two objects with overlapping extended 
input Time Limits, giving a different Jump Label to the input mask 
for each object.  In this case, any input that I gave that had End 
Action = Jump jumped to the Jump Label from the second object, never 
to the Jump Label from the first object.

3) If you look into the code generated by E-Prime, you will see why 
this must be so.  First, you will see that every Label object 
produces the following code:  If Err.Number = ebInputAccepted Then 
...  Second, you will see a line like On Error Goto MyJumpLabel back 
up by where your input mask gets reset (and note further that 
MyJumpLabel never appears in the input mask definition itself).  From 
that you will see that E-Prime implements Jump Labels merely by some 
clever hijacking of the error handling facility built into Visual 
Basic.  And since Visual Basic (and thus E-Basic) can have only one 
error handler in effect at any time, E-Prime can have only one Jump 
Label in effect at any time.


Just trying to keep the record straight.  Of course, you will not 
find anthing about this in the documentation from PST.  And as usual, 
do not take even my word for any of this, you have to try it out for yourself.

Best regards,
-- David McFarlane, Professional Faultfinder

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