Feedback for anticipation

[Michiel Spape]

Hi Vera,
Programming languages seldom care about the psychology of anticipation, but what you want seems quite easily achieved, either with or without inline.
So, we have a fixation, say, a textdisplay with a little plus (my preferred crosshair), some images, then the rest of the task?
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

Or something, anyway. At some point, one can make things much more difficult without coding than with, and at that point, it's time to do some script.

Fixation-->Inline1-->Stimuli-->Label1-->EndOfTrial

With Inline1 being a little inline saying 
SoundWarning.Play 'SoundWarning being either a sounddevice thingy you have in unreferenced objects, or a buffer which you coded (easily found in ebasic help)
Goto Label1

Third, [A psychological consideration]
You might want to consider just filtering out the responses. I know how tempting it is to do all these kinds of things, but consider: A) it takes longer to programme; B) your subjects might get confused with all that feedback; C) you might affect RT distributions adversely by forcing subjects to perform overly fast or slow. If you find subjects performing too fast, you might want to consider underlining that they need to perform more accurately (say, every 10 trials).

Best,
Mich


Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology

-----Original Message-----
From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of Vera
Sent: 14 March 2010 14:45
To: E-Prime
Subject: Feedback for anticipation

Hi again! :-)

Another question:

is there some way to give feedback for "anticipated" responses? Let's
say the participant gets to see a fixation cross and then some images.
By an effect of anticipation, it could be that he/she already pushes a
button before even seeing the actual stimulus. I was wondering if
there was some way to have a wav.file saying "too early".

I fiddled something together with my fixation cross being followed by
a feedback screen (I repeat the fixation cross at the feedback screen
in a text box) but it just doesn't work out right. :( E-Prime does
indeed give out the "too early" wav.file when a button is pushed when
the fixation cross is still there, but then I have two other
problems:

1. Of course it doesn't detect if a button is pushed WHILE the
feedback screen in shown (thus not giving any feedback).
2. On my feedback screen, I actually don't see the fixation cross (I
only hear the sound-feedback).

Am I giving myself a too hard time here, or did I just oversee some
function in E-Prime? Is there something like "anticipation feedback"?

Thanks to anybody who can give me a clue! :-)

Greetings, Vera

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