The Diamonds Must Be Returned

…” Watson’s discussion of this phenomenon covers less than two pages. (Except where noted, all references to Watson are to pages 147 and 148.) But this brief report has inspired much attention. Following Watson, a book (Keyes 1982), a newsletter article (Brain/Mind Bulletin 1982), and a film (Hartley 1983) have each been created with the title “The Hundredth Monkey.” In addition we find a journal article entitled “The ‘Hundredth Monkey’ and Humanity’s Quest for Survival” (Stein 1983) and an article called “The Quantum Monkey” in a popular magazine (Science Digest 1981. Each relies on Watson as the sole source of information on the remarkable and supernatural behavior of primates.
The monkeys referred to are indeed remarkable. They are Japanese macaques (Macaca fuscata), which line in wild troops on several islands in Japan. They have been under observation for years. During 1952 and 1953 the primatologists began “provisioning” the troops – providing them with such foods as sweet potatoes and wheat. The food was left in open areas, often on beaches. As a result of this new economy, the monkeys developed several innovative forms of behavior. One of these was invented in 1953 by an 18-month-old female that the observers named “Imo.” Imo was a member of the troop on Koshima island. She discovered that sand and grit could be removed from the sweet potatoes by washing them in a stream or in the ocean. Imo’s playmates and her mother learned this trick from Imo, and it soon spread to other members of the troop. Unlike most food customs, this innovation was learned by older monkeys from younger ones. In most other matters the children learn from their parents. The potato-washing habit spread gradually, according to Watson, up until 1958. but in the fall on 1958 a remarkable event occurred on Koshima. This event formed the basis of the “Hundredth Monkey Phenomenon.”
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The Miracle on Koshima
According to Watson, all of the juveniles on Koshima were washing their potatoes by early 1958, but the only adult washers were those who had learned from the children. In the fall of that year something astounding happened. The exact nature of the event is unclear. Watson says:
. . . One has to gather the rest of the story from personal anecdotes and bits of folklore among primate researchers, because most of them are still not quite sure what happened. And those who do suspect the truth are reluctant to publish it for fear of ridicule. So I am forced to improvise the details, but as near as I can tell, this is what seems to have happened. In the autumn of that year an unspecified number of monkeys on Koshima were washing sweet potatoes in the sea. . . . Let us say, for argument’s sake, that the number was ninety-nine and that at eleven o’clock on a Tuesday morning, one further convert was added to the fold in the usual way. But the addition of the hundredth monkey apparently carried the number across some sort of threshold, pushing it through a kind of critical mass, because by that evening almost everyone was doing it. Not only that, but the habit seems to have jumped natural barriers and to have appeared spontaneously, like glycerine crystals in sealed laboratory jars, in colonies on other islands and on the mainland in a troop at Takasakiyama.
A sort of group consciousness had developed among the monkeys, Watson tells us. It had developed suddenly, as a result of one last monkey’s learning potato washing by conventional means. The sudden learning of the rest of the Koshima troop was not attributable to the normal one-monkey-at-a-time methods of previous years. The new phenomenon of group consciousness was responsible not only for the sudden learning on Koshima but for the equally sudden acquisition of the habit by monkeys across the sea. Watson admits that he was forced to “improvise” some of the details – the time of the day, the day of the week, and the exact number of monkeys required for the “critical mass” were not specified in the scientific literature. But by evening (or at least in a very short period of time) almost everyone (or at least a large number of the remaining monkeys) in the colony had suddenly acquired the custom. This is remarkable in part because of the slow and gradual mode of acquisition that had typified the first five years after Imo’s innovation. Even more remarkable was the sudden jumping of natural boundaries, apparently caused by the Koshima miracle.”…