Face Recognition Task

[liwenna]

Well.. your current task design is somewhat complex in that is has
several 'phases' but in terms of 'e-prime mechanics' it's actually
very basic. And from what I gather this whole assignment is ment to
get you 'going on e-prime' so explaining you how to do everything and/
or sending you a file would completely defy the point.

You had an introductionary course and you have several e-prime guides
(including the one by Michiel) so you ought to get your way around a
bit with lists, procedures and slideobjects.

I'll repeat my earlier advice to start with just one of the phases of
your experiment e.g. the passive viewing of faces and disregard the
rest at first. One pointer that I'd like to give is that instead of
telling your imageobject directly which file it should show (i.e.
state something like 'filename.jpg' in the box 'filename' you can also
tell it to fetch a filename from a list that has different filenames
in it's different levels. To do this put the filenames in a list under
an attribute called for instance 'stimulusfile' and in the filename
box of the imageobject fill out [stimulusfile].

Best,

liw


On Feb 4, 6:23 pm, scarpais <scarp... at hotmail.co.uk> wrote:
> Hi liw,
>
> Thank you so much for your quick response. I apologise for the late
> reply.
>
> In answer to your first comment, the teacher felt that given time
> constraints, it would be impossible to program this design (dot
> probe). I have little time in which to do this task! It is ostensibly
> a simple design from my point of you also but I know little about E
> Prime and I think that's what he was getting at.
>
> In answer to the following:
>
> Do I get this correctly: you first want to run a list of faces each
>
> > shown once for a designated time and the subject does not need to do
> > anything but view? Followed by a list of words and again the subject
> > only needs to view? Then faces are shown again and this time the
> > subject needs to indicate by a buttonpress whether or not this face
> > has been shown before, followed by a word list and again subjecst need
> > to indicate whether or not they recognise the words?
>
> This is correct. Simple as you can see. Only again, the fact that I
> know little about E Prime is making the task impossible. I have now
> sat for hours trying to work out how to do this to no avail :(
>
> On Jan 31, 1:44 pm, liwenna <liwe... at gmail.com> wrote:
>
> > Hey Scarpais,
>
> > Quite frankly I fail to see how a dot-probe is too problematic to
> > design using e-prime. E-prime is absolutely able to 'do it'. So...
> > could it be that your teacher actually tried to say that your set-up
> > was too complex for that specific assignment? I.e. a too complex
> > design for the given time?
>
> > As for your new design: it seems about as complex as your intial
> > design was? Is what you describe the course of a single trial or the
> > complete test? I gather the latter? Then what would be the purpose of
> > response times?
>
> > Do I get this correctly: you first want to run a list of faces each
> > shown once for a designated time and the subject does not need to do
> > anything but view? Followed by a list of words and again the subject
> > only needs to view? Then faces are shown again and this time the
> > subject needs to indicate by a buttonpress whether or not this face
> > has been shown before, followed by a word list and again subjecst need
> > to indicate whether or not they recognise the words?
>
> > Well you had a basic lesson of e-prime so you're familiair with lists
> > and procedures. What you need are four lists on your testprocedure,
> > one for each type of stimulus (faces no interaciton, words no
> > interaction, words recognition and faces recognition) and a separate
> > procedure for each proc. Each procedure would hold a slide  (or a text/
> > imageobject) that shows the stimulus and has it's properties set to
> > the needs of that list. And perhaps some fancy extra's like a
> > trialinterval slide. It's really quite simple.
>
> > Don't fear e-prime! Open your e-studio and simply start making the
> > first part of the experiment: faces passive viewing. Once you got that
> > you can add the words passive viewing and from there it's not hard to
> > create the faces and words recognitions lists and procedures. Just
> > take it step by step and I think you'll find that it's all far less
> > difficult than you think now.
>
> > Also: Michiel's book is a really nice guide, and I read that you have
> > some other guides as well. Consult them when you're stuck but dont'
> > fear to just start fiddling around in e-studio.
>
> > Good luck!
>
> > liw
>
> > On 30 jan, 11:16, scarpais <scarp... at hotmail.co.uk> wrote:
>
> > > Hi all,
>
> > > As a newcomer to E Prime I have been told that my proposed experiment
> > > is going to be too problematic to design using E Prime. My initial
> > > idea was to design a dot-probe task to measure response times and
> > > accuracy to the dot probe following paired presentations of a neutral
> > > vs. an emotional face (happy/sad) and also for neutral vs. emotional
> > > words.
>
> > > I have went to some lengths however to get my stimuli and would like
> > > to design something based around this. I was thinking perhaps a face
> > > recognition task to investigate response times and accuracy once more.
> > > This time, the faces would be presented in the first instance, a
> > > mixture of both happy, sad and neutral but this time only one pic at a
> > > time. Following this, I would like to present a some words
> > > sequentially. Again these would be a mix of neutral and emotional
> > > words.
>
> > >  After this, I would like to present the target  faces once more and
> > > also some face stimuli not included in the first part of the
> > > experiment and ask participants to state whether this face appeared in
> > > the first trial or not and then do the same again for the words.
> > > Measuring both accuracy and response times.
>
> > > This doesn't sound too complicated to me but as a relatively new
> > > EPrimer I am clueless as to how to go about doing this. I have a
> > > couple of starting up guides with examples and wondered if anyone had
> > > an example/tutorial that would show me step by step how to do this
> > > particular type of experiment? If not, if anyone had any suggestions
> > > as to how I can do another experiment using this stimuli I'd be
> > > extremely grateful.
>
> > > I have been informed that my task is to design an experiment using E
> > > Prime and that it does not matter if it is from an online example or
> > > tutorial as long as it is not one of the ones from the E Prime
> > > starting guide.
>
> > > Thanks for reading this!- Hide quoted text -
>
> > - Show quoted text -

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