These are the raw data file for Experiment 1 reported in the following publication:

Petrov, A.  (2010). Category rating is based on prototypes and not instances: 
  Evidence from feedback-dependent context effects. 
  Journal of Experimental Psychology: Human Perception and Performance, ?, ??-??.   
PDP preprint available at http://alexpetrov.com/pub/jephpp10/

The data was collected at Carnegie Mellon University in 2001.  
This experiment was developed and stored under the name "fdbk1".
It was administered using Macintosh Common Lisp (MCL) -- the full code is
available in fdbk1/prog/fdbk1_one_file.lisp. Among other things, it
contains the verbatim instructions that appeared on the screen.

There is one file per subject. All files are in ASCII format.
Each file contains one row per trial and the following columns.
See the function report-trial in fdbk1/prog/fdbk1_one_file.lisp for details.
See fdbk1/data/html/empir_ARL2_profile.html for the Matlab code that
generated Figures 2 and 3 in the JEP:HPP paper.

-- Alex Petrov  2010-07-26

Variable names (columns):
 1. Subject number
 2. Group:  1='U1', 2='L1', 3='H1', 4='not used', 5='L2', 6='H2'
 3. Clock:  absolute time [msec] since beg. of expmt
 4. Subblock
 5. Experiment trial number
 6. Schedule (aka Context):  1='Unif w/ fdbk', 2='U w/o fk', 3='Low w/ fdbk', 4='L w/o fk', 5='High w/ fdbk', 6='H w/o fk'
 7. Distance [in pixels]
 8. Category:  1-7. This is also the correct answer.
 9. X1:  X-coordinate of the left dot in the pair
10. X2:  X-coordinate of the right dot in the pair
11.  Y:  Y-coordinate of both dots
12. Feedback:  0="X"
13. Exitcode:  0='fail', 1='OK'
14. Rating:    Subject's response 1-7
15. RT:  Response time [in msec]


