Belief propagation in multi-agent communities (II)

To study this phenomenon, we have designed another experiment: in this case, two populations of agents are formed, each with its own fixed vocabulary (100, 200, 300 and 400 for one population, 500, 600, 700 and 800 for the other). Furthermore, initial beliefs are set to 200 for the first two words and to 1 for the third and fourth word. This experiment tries to discern whether the delay to acquire uniformity depends on how strong beliefs are, and on the number of words.

We have found that the delay is not related on how strong the beliefs are, but it is related to the number of different words in the population, and how similar belief indicator are among the two populations. When only two words are present, these delays occur often. The behavour of this system depends also on whether both populations are mixed in space, or initially separated. In the first case, uniformity may be reached very quickly This is because in a draw case a dominant word remains, and also due to the deterministic way of changing the word. But even in the case of initial mixed populations, there are cases when uniformity takes a long time to be reached.

In the next simulation, we show an experiment with two different initial words and separate populations of 200 agents each, located at both sides of an imaginary line dividing the micro-world in to halfs.

Press the 'Continue' button to start the simulation

This is the complete OOCSMP code for the previous simulation.
In the previous simulation, it can be observed that sometimes, the uniformization of some of the words is reached very soon. The next simulation shows a similar experiment, but the panels have been changed in order to show the beliefs of the community in the word associated with the 'north' (left panel) and the population of each set of agents (right panel). Press the 'Continue' button to start the simulation

This is the complete OOCSMP code for the previous simulation.

Obviously, the population curves (right panel) are symmetric with respect to a line parallel to the x axis and with an height of 200. It can also be noted that the derivative of the population always has the same sign as the derivative of the belief indicators. In fact, the belief indicators curve and the population curves (for the same population) are very similar.

Simulations with 3 different populations have also been carried out. Situations when one word dissapears and two words interact, as in the previous simulation, are common.

Belief propagation in multi-agent communities
Belief propagation in multi-agent communities (III)