In 1953, Dr. James McConell began performing labyrinthine experiments with planarian worms (Dugesia dorotocephala) at the University of Michigan, training them, using the punishment operand of classical conditioning, to learn over a period of months to consistently follow the most effective route through a maze.

This is all old hat. Planarian worms are cheaper to buy and keep alive than lab rats. Nothing new. But it was what he did next which raised a few eyebrows.

Keeping track of how long it had taken the entire first group of worms to successfully learn how to run the maze, he killed them all and fed the remains to a second group of hitherto untrained worms. Keeping this second group and a third control group of planarians (on a normal, non-cannibalistic diet) isolated, they were all trained to run the same maze using the same method as with the first group of worms.

The control group of worms took roughly the same amount of time to learn to run the maze as the first batch had, but the group which had eaten the first, educated bunch learned to run the maze considerably faster than both the control group and the original group on which they had dined. It was as though by eating the first group of learned worms, they had in some small way attained a not insignificant glimmer of the knowledge which had been previously imparted unto their dinners.

Similar results were later got when unschooled worms were injected with the RNA of successful maze-runners, leading to a controversial theory of the relation between RNA and memory, and later similar experiments produced further similar results in rats, goldfish and canaries.

There are some problems with this almost-50-year-old experiment, some of which I am more qualified to effectively communicate than others, but I will attempt to present them all:

    1) In natural conditions, flatworms will react to light by elongating and to shock by contracting, while in this experiment they were apparently trained in a completely topsy-turvy manner - contracting in response to light and elongating when exposed to shock, thus not only were they being trained to run a maze but to do so in complete opposition to their instincts. That raises questions and variables which weren't taken into account during the course of the original experiment, and could quite conceivably have skewed the results;

    2) The propensity of planarian worms is to choose to follow a path coated in the mucous or slime trail left by a previous worm rather than to slither off in new directions. Some believe that rather than training the worms to run mazes at all, the researchers were merely establishing a slime highway that eventually all the worms figured out the onramp to. Would the subsequent dietary results indicate then that the cannibal worms would have had their natural inclinations towards following slimy paths reinforced? What exactly would the scientists have been measuring?

    3) (This one is my favourite.) The most common objection to the whole experiment I've heard is that the cannibal worms were better fed, being provided the nourishing bodies of their predecessors rather than the typical merely-sustaining lab wormfood! It is widely accepted that malnutrition impedes learning in human beings - thus school lunch programs - so why not in worms as well? This objection fails to account for results attained by the RNA injections.

If anyone can explain further (or better explain the ones I have here) reasons why these experiments are not presently looked upon as tremendously scientific, I would be pleased for you to share in the subsequent writeups or to /msg me.

On a tangent to this subject matter, it was also discovered in experimentation that the regenerative abilities of planarian worms didn't just extend to physical organs but memories as well! If you cut the head off of a trained planarian worm, once it grows back the worm will be able to run mazes as effectively as before, yet if a worm is cut in half (so that each half grows back another half-worm, resulting in two worms) only one of the resultant worms will have retained the training. This shows that memory in worms is located somewhere other than its head.

Dutch artist M.C. Escher produced a lithograph in 1959 named Flat worms (Platwormen) (viewable online at, depicting a structure formed from alternating tetrahedronal and octahedronal bricks with cute l'il flatworms slithering all over them. He noted that such a structure would be impractical for humans as the resulting surfaces produce neither vertical walls nor horizontal floors, but if it filled with water it would work dandy as a home for flatworms. Kibo (of Usenet infamy) points out the unutilised possibility here - Escher using worms in his works prior to the scientific establishment of both their regenerative and maze-running abilities - and hypothesizes that if only he'd known, Escher would have depicted planarian worms regenerating in the forms of moebius strips while running geometrically impossible labyrinths. Anyone with a passing familiarity with Escher's work can agree that this wouldn't be atypical for the Dutch mindbender.

For a time, experimenters in this field published a special-interest newsletter / scientific journal entitled Worm Runners Digest. The names of two articles from scientific journals dealing with the phenomena described above follow:

I am pleased as punch to finally have found a way to put comic books, Kibo, cannibalism and M.C. Escher all in the same node.

So, logically, since EDB ingests so many of us on a regular basis, his nodes should be the best, potentially. Or they may not be.

Of course, in making this statement, there are things I may be overlooking:

1) EDB doesn't always eat the best noders. While the quality of a noder is a subjective judgement, sheer probability dictates that he eat bad ones, too. Also, EDB often goes after the troublemakers, so he may be readying himself for troublemaker noding. And who's to say that Chatterbox participation is a good quality by which to select prey?

2) (This one is my favourite) EDB may or may not be a flatworm, or act like one, all of the time, or some of the time.

3) Since there is only one EDB, we are without a control in this experiment. However, if we were to locate a supply of hungry, willing noders (as force-feeding "volunteers" would undoubtedly skew the data) to feed, this may yet be overcome.

In the interests of maintaining high scientific standards, I feel obligated to note that before the cold fusion debacle, McConnell’s planaria study was the standard by which Bad Science was judged.

"McConnell's research program with planaria collapsed when other scientists failed to replicate the phenomenon of memory transfer." -- American Psychologist 51:589-598.

McConnell's results on transferred memories did not hold up. A great discussion of the failure of McConnell's research can be found in The Making of Memory: From Molecules to Mind by Steven Rose (1993, ISBN 0385471211).

If any of these worms were truly smart, they'd see the little morsels of their brethren on the plate in front of them and decide that it's better to fail the maze.

Besides, it's been known for a while that animals, including humans, who eat each other's brains can get kuru, CJD, BSE, scrapie, or a host of other prion-related degenerative neurological diseases. That makes it not a very smart thing to do.

Leading on from Pseudo_Intellectual's post...

You mentioned the worms being cut in half and memories being retained. I have in front of me a book, containing part of a report on an experiment performed by Thompson and McConnell whilst they were studying at The University Of Texas.

The experiment consisted of teaching the flatworms to avoid an electric shock by swimming towards a light source.
The worms were then chopped in half and left to regrow heads and tails, as appropriate. It was found that all the worms retained the skill of avoiding the shocks.
This introduced the idea of memory molecules, particles that exist in multiples and can migrate.

The experiment was recreated in 1960, only this time the worms that had learned to swim to the light were chopped up and fed to another group of worms, then tested with a control group. The cannibal worms retained the memories, while the control group showed no evidence of immediate intelligence.

As requested by bindlenix, the book that this is from is... "The Odd Body" by Dr Stephen Juan ISBN 0-207-18816-5

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