The pike is one of the most efficient, lean predating machines in freshwater. If you put a small pike in an aquarium with a bunch of minnows it will demonstrate its predatory skills with frightening efficiency. If you separate the pike from the minnows using a sheet of perspex the pike will continue to launch its attacks for a little while. And then it will just give up. You can then remove the sheet of perspex and the pike will still believe that it can no longer catch its prey - and will simply starve to death.
This little tale is similar to the "Learned helplessness" theory which can also be found in my blog and is posted at an earlier date.
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