An example of the learning task:

 (learned first)      (learned second)       (re-learned, third)

     Pair 1                Pair 2                 Pair 1
 

   CEF   stem             CEF    smell          CEF    stem
                                  (shock)
 
   GEX   justice          GEX     war           GEX    justice
                               (no shock)
 
etc....
 
 

     RESULTS           % NOT remembered at time three
 

    Pairs associated with shock:  38% (62% correct)
 

    No-shock association:   9%  (91% correct)