The Blue Jay Bookshelf

Tool-making and tool-using in the northern blue jay.

Laboratory-raised Northeirn blue jays (Cyanocitta cristata) have been observed tearing pieces from pages of newspaper and utilizing them as tools to rake in food pellets which were otherwise out of reach. The frequency of this behavior was dependenit upon the motivational state of the jay and the presence of food pellets.

Search Image Formation in the Blue Jay (Cyanocitta cristata).

Blue jays trained to detect Catocala moths in slides were exposed to two types of slide series containing these moths: series of one species and series of two species intermixed. In one-species series, detection ability increased with successive encounters with one prey type. No similar effect occurred in two-species series. These results are a direct demonstration of a specific search image.

The Software Bookshelf

The Virtual Bookshelf Approach

The amount of information that people have to handle in their everyday life has increased and more is asked of their cognitive ability to select and assimilate the information that is important to them. One way to facilitate the cognitive work is to match information objects with each other and select/filter the ones that are relevant. To do this selection objects must be represented in such a ...

Jay Johnson

It is seldom possible to plausibly define and observe a pool of potential entrants to a market. This study overcomes that limitation by taking advantage of an opportunity to reasonably define the potential entrants into MTBE production, a rapidly growing environmental product from the mid-1980’s to mid-1990’s. Potential entrants are identified as those firms having access to specific assets tha...