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. 2014 Jul 31;4:5890. doi: 10.1038/srep05890

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Simple urn model with triggering (a), (b) and urn model with semantic triggering (c), (d). (a) Generic reinforcement step of the evolution. An element (the gray ball) that had previously been drawn from the urn is drawn again. In this case one adds this element to (depicted at the center of the figure) and, at the same time, puts ρ additional gray balls into . (b) Generic adjacent possible step of the evolution. Here, upon drawing a new ball (red) from , ν + 1 brand new balls are added to along with the ρ red balls of the reinforcement step that takes place at each time step. (c), (d) Urn model with semantic triggering. Same as above except that now each ball has a label defining its semantic context. The label is conserved during a reinforcement event (e.g., the label A for the gray balls on panel c) while it appears as a brand new label, C, for the ν + 1 balls added for an adjacent possible event (panel d).

Inline graphic — Simple urn model with triggering (a), (b) and urn model with semantic triggering (c), (d). (a) Generic reinforcement step of the evolution. An element (the gray ball) that had previously been drawn from the urn is drawn again. In this case one adds this element to (depicted at the center of the figure) and, at the same time, puts ρ additional gray balls into . (b) Generic adjacent possible step of the evolution. Here, upon drawing a new ball (red) from , ν + 1 brand new balls are added to along with the ρ red balls of the reinforcement step that takes place at each time step. (c), (d) Urn model with semantic triggering. Same as above except that now each ball has a label defining its semantic context. The label is conserved during a reinforcement event (e.g., the label A for the gray balls on panel c) while it appears as a brand new label, C, for the ν + 1 balls added for an adjacent possible event (panel d).