[open] buid treisman test - problem with sketchpad

arsinoe

hi,

I would like to build the classical treisman test in opensesame (same as the experiment proposed online)

So in the sequence, I include a sketchpad
On the tutorial, a serie of cat's faces are uploaded into the sketchpas

Should I create a serie of image with green and red letters
or could I create those in opensesame

I mean, 40 cat's faces are included in the sketchpad
if I draw on the sketchpas, I'll have only one image...

thank for the help
Nicolas

sebastiaan

Hi Nicolas,

A visual-search paradigm, such as the Treisman & Gelade one, requires a bit of Python scripting. You won't be able to implement it using only a sketchpad, or at least not in an efficient way. I would recommend taking a look at these discussions:

• http://forum.cogsci.nl/index.php?p=/discussion/537/
• http://forum.cogsci.nl/index.php?p=/discussion/173/

Cheers!
Sebastiaan

arsinoe

Hi Sebastiaan,

scripting/programming is not my thing, so I created each pic myself and imported them just like the catfaces of the tutorial

and it works

still, each time I launch the test, it generates a csv file. Is it possible to accumulate the results from different subjects into one single datasheet ?

and is it possible to decide what parameters should appear in the csv file ? There are too many columns for my needs.

another thing is in the variable fname, I don't have access to the file list, I need to write each file name myself (on the video tutorial it seems the file names appear automatically in the fname column after they have been selected in the sketchpad ?)

thank you
Nicolas

sebastiaan

Hi Nicolas,

still, each time I launch the test, it generates a csv file. Is it possible to accumulate the results from different subjects into one single datasheet ?

Not directly, but you can merge the data files with DataMerger:

• http://osdoc.cogsci.nl/usage/logging/#merging-multiple-data-files-into-one-large-file

and is it possible to decide what parameters should appear in the csv file ? There are too many columns for my needs.

Yes, you can disable the 'Automatically detect and log all variables' option in the logger, and then select only the variables that you need.

another thing is in the variable fname, I don't have access to the file list, I need to write each file name myself

Do you mean the name of the logfile? I see that it's indeed not logged automatically. But you can easily do this by adding logfile as a custom variable in the logger. (The variable exists, it's just not automatically picked up by the logger.)

Cheers!
Sebastiaan

arsinoe

thank you Sebastiaan

opensesame is user friendly and efficient and your willingness to help in the forum saved me hours