What observer rats don't learn about foods from demonstrator rats

Naive "observer" rats that interact with conspecific "demonstrators" fed a distinctive food increase intake of the food their demonstrators have eaten . Here we found that observer rats that had interacted simultaneously with 2 demonstrator rats, 1 fed a distinctively flavored, protein-poor food, the other a distinctively flavored, protein-rich food, did not prefer the form er. Similarly observer rats ate equal amounts of two distinctively flavored foods after interacting simultaneously with 2 demonstrator rats, 1 that ha d consumed all food available to it, the other fed from a surplus of the se cond food. Last, observer rats that had interacted with both a "trustworthy " demonstrator (1 an observer had learned ate only nutritious foods) and an "untrustworthy" demonstrator (1 an observer had learned ate noxious substa nces) did not prefer unfamiliar foods eaten by trustworthy demonstrators to those eaten by untrustworthy demonstrators. These findings suggest limits on social information observers use in selecting foods.