Fig. 2.

Experiment 1A. Postlesion CTA retention tests. The first three 15-min exposures were two-bottle (2B), water and the CS, alanine. The fourth test was one-bottle (1B), alanine. Lateral hypothalamic lesions (LHx); n = 13 (A), controls; n = 6 (B), anterior LHx (aLHLx); n = 6 (C), posterior LHx (pLHx), n = 7 (D). Data are expressed as means ± SE. In each 2B test, some rats with pLHx ingested alanine. Both the controls (Con) and the aLHx group drank only water, but the differences between the three groups were not significant, F(2,16) = 2.28, P = 0.13. In the 4th 1B test, the latter two groups also failed to ingest the CS. In the same test, however, the pLHx group ingested more than 10 ml of alanine, F(2,16) = 13.6, P < 0.001.