Table 1 List of key parameters and variables
From: The evolution of social learning mechanisms and cultural phenomena in group foragers
Name | Description | Values |
|---|---|---|
R | Number of resources species | 250 |
Q r | Maximum energy reward of resource type r | N(0.1,0.1) |
H r | Practice time needed before obtaining half the maximal reward | 0.1..10 |
S r | Scalar for the sigmoid function describing how rewards increase with practice | 1..4 |
EC | Rate at which resource types are replaced by new types | 0..R types per year |
N | Population size | 100 |
G | Maximum number of foragers in a group | 20 |
COPY_SPACE | Distance at which foragers can observe what their neighbors are doing | 20 |
K | Effectiveness of observational learning | 0.1 |
M | Maximal time to process and consume a resource item | 1 min |
a ir | Expected reward forager i has for resource type r | any |
a ie | Expected quality of the environment of forager i | any |
e ir | Energy reward forager i obtains from resource type r | any |
c ir | Certainty of forager i about reward obtained from resource type r | 0.. inf |
s ir | Skill of forager i for processing resource type r | 0..1 |
t ir | Experience (total time) forager i as processing resource type r | 0.. inf |
λ i | Reinforcement learning rate | 0..1 |
ε i | Exploration rate | 0..1 |
γ i | Stimulus enhancement | 0..1 |
ω i | Probability to OBSERVE neighbor | 0..1 |
Ï„ i | Duration of OBSERVE | 0.01..1 min |
Ï• i | Update parameter for a ie | 0..1 |
δ i | MOVE distance of forager i | 0.. inf |