Table 1.

Class
. | Median^{2}evolutionary activity ($A\xaf$_{cum})
. | Change
. | Novelty (A_{new})
. | Diversity (or ecology) (D)
. | Complexity
. | Type of evolutionary dynamics
. | Described in
. |
---|---|---|---|---|---|---|---|

1 | zero | ? | zero | bounded | bounded | None | Bedau et al. [6] |

2 | unbounded | ? | zero | bounded | bounded | Uncreative | Skusa and Bedau [42] |

3 | bounded | positive | positive | bounded | bounded | Bounded | Bedau et al. [6] |

4a | bounded | positive | positive | unbounded | bounded | Unbounded | Bedau et al. [6] |

4b | unbounded | positive | positive | bounded | ? | Unbounded | Channon [12] |

4c | unbounded | positive | positive | unbounded | ? | Unbounded | Channon [12] |

Class
. | Median^{2}evolutionary activity ($A\xaf$_{cum})
. | Change
. | Novelty (A_{new})
. | Diversity (or ecology) (D)
. | Complexity
. | Type of evolutionary dynamics
. | Described in
. |
---|---|---|---|---|---|---|---|

1 | zero | ? | zero | bounded | bounded | None | Bedau et al. [6] |

2 | unbounded | ? | zero | bounded | bounded | Uncreative | Skusa and Bedau [42] |

3 | bounded | positive | positive | bounded | bounded | Bounded | Bedau et al. [6] |

4a | bounded | positive | positive | unbounded | bounded | Unbounded | Bedau et al. [6] |

4b | unbounded | positive | positive | bounded | ? | Unbounded | Channon [12] |

4c | unbounded | positive | positive | unbounded | ? | Unbounded | Channon [12] |

Notes. For each class, we show the response of all quantities measured for evolutionary activity statistics and in our proposed metrics (novelty and diversity should behave equivalently between the two systems). Note that we expect bounded evolutionary activity to imply bounded complexity, as any scenario in which complexity is growing without bound should imply that evolutionary activity is too. Question marks indicate that the value of a given metric is not specified in the description for a class of evolutionary activities. Higher-numbered classes are generally believed to fall further along the continuum of open-endedness than lower-numbered classes. In principle, classes 4b and 4c could each be further split into subclasses based on whether complexity is bounded or unbounded. Likewise, classes 1 and 2 could be further subdivided based on whether change is 0 or positive. In the absence of further data on the behavior of real-world systems, it is unclear how helpful such increased precision would be.

This site uses cookies. By continuing to use our website, you are agreeing to our privacy policy.