Kommande experiment
"The brain is an interesting object in that it is an ex- cellent computer but we don’t know how it functions. And we don’t know how brainless microorganisms perform information processing. In fact, what we re- ally don’t know is the extent of the capacity of the microorganism to process information.
Information processing is defined in a formal way as transformation from input to output of a signal. Input of a signal comes from the external environment which surrounds a biological system. It is seemingly difficult to detect output signals, but it would be possible if we observed the overall behavior of a biological system, since the total behavior is regarded as the final output of information processing. So what we would like to do is to study how an organism behaves in various types of external conditions.
It is tempting to seek complex conditions in which the organism shows interesting behavior. For exam- ple, if one food source is available somewhere in the area in which a starved organism is residing, then the organism should move to the food source. This is simple reasoning, but let us suppose that two food sources are available separately at two different posi- tions in the spatial area. What sort of behavior could be expected? We may haphazardly find something interesting in their behavior. At this point, however,
E-mail address: [email protected] (T. Nakagaki).
we should keep in mind that we don’t always under- stand the physiological role of behavior. It is, in gen- eral, difficult to prove that a certain behavior plays no physiological role, since it may contribute to some- thing unknown. In this sense, to study a physiological role of behavior in a complex situation is to clarify the intelligence of the organism.
In this article, we discuss whether interesting behavior on the part of a microorganism, in this case the plasmodium of true slime mold in a complex situation in which there are two food sources in a labyrinth, is somewhat akin to primitive intelligence."