Salt processing in larval Drosophila: choice, feeding, and learning shift from appetitive to aversive in a concentration-dependent way.

Larvae show aversive memory scores for 1.5 M sodium chloride but not for any lower concentration ( Figure 3B ; all statements refer to one-sample sign tests at a P level of .05/5); an apparent trend for aversive learning when using 0.75 M sodium chloride remains, due to the large scatter of the data, not significant (i.e., P = .3) despite a substantial sample size (i.e., N = 35).

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