As promised in my earlier post, now that the two articles on fruit fly learning have appeared in Learning & Memory, I have now posted them to brembs.net. The first article shows how stimuli with increasing predictive value are increasingly better learned. This shows that even flies are extremely sensitive to slight variations in the "predictiveness" of features in their environment and can handle these tasks to a surprising degree of flexibility. The second article shows that the processes underlying this flexibility (discrimination or generalization) can be separated already at the behavioral level. Flies extract parameters from the stimuli and use different sets of parameters for discrimination and generalization, respectively.
L&M links:
Context and occasion setting in Drosophila visual learning
Different parameters support generalization and discrimination learning in Drosophila at the flight simulator
You can also download them in PDF from the download section.