Hi Terry and All; Worms do not have a brain they have a nerve ganglion. It is capable of sensory detection and reactive nerve impulses to control muscles of the worms body. No matter how you try they will never learn a single thing.

Not quiet true- in Clive Edwards book, he quotes a study in which worms could be taught to turn right instead of left in a maze in pursuit of food, and to avoid an electrical (unpleasant) stimulus.
The really freaky thing is that if you cut the worm's 'head' off- (the segments with the main nerve ganglion)- the worm would still take the 'learned' path--UNTIL IT GREW A NEW GANGLION_ then it would 'unlearn'!

Found an online link to that report:

Here is a link that might be useful: clive edwards book

That explains why I enjoy the worms so much. All my other pets did not learn anything either and they were a real bother. Stupid dogs...

cathd66 now that is cool! thanks for posting