Figure 1.
Neonatal experience with paired odour-shock resulted in an odour preference. In neonatal pups, 5 days of pairing odour and aversive shock (0.5 mA) resulted in a relative odour preference during infancy. Unpaired odour-shock and odour-only learning controls did not exhibit learning in the 2-odour choice Y-maze test (*P < 0.01 from both unpaired and odour-only treatment groups).