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ROBERT P. ERICKSON 



or NaCl in a single tube test (total of nine rats). Shocks (1 mA for 0.3 sec) 

 were delivered through the feet whenever the rat drank for about 2 sec. 

 On several days following the avoidance training, recovery of drinking 



Table 1. Correlations between single chorda tympani fiber responses to a 



NUMBER OF TASTE SOLUTIONS. OnLY ONE CONCENTRATION OF EACH SOLUTION USED. In 

 EACH CELL IS GIVEN FIRST THE PRODUCT-MOMENT CORRELATION COEFFICIENT, THEN THE 

 NUMBER OF FIBERS UPON WHICH THIS CORRELATION IS BASED, AND FINALLY, FOR THE LARGER 

 CORRELATIONS, THE PROBABILITY THAT A CORRELATION OF THIS MAGNITUDE WOULD OCCUR 

 BY CHANCE IF THE CORRELATION WERE ACTUALLY ZERO. 



the training stimulus or another salt was noted. Being shocked for drink- 

 ing KCl resulted in a depression of drinking rates for both KCl and 

 NH4CI, but not so much depression of NaCI drinking. Similarly, being 

 shocked for drinking NH4CI resulted in a depression of drinking rates for 

 both NH4CI and KCl, but not so much for NaCl. The depression of 

 drinking from being shocked for NaCl generalized somewhat to both the 

 other salts, but not selectively more to one than the other. 



In the second behavioral test, two rats each learned to avoid drinking 

 one of the three salt solutions used in the first behavioral test in a three- 

 tube test (total of six rats). Shocks (3mA) were applied between the metal 

 drinking tube and the floor whenever the rat drank for about 2 sec. Each 

 rat was first trained to avoid one of the three salts, and then tested for 



