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Evolution of human cooperation without
Balaraju Battu
Centre of Behavioural and Cognitive Sciences
(CBCS) University of Allahabad, Allahabad
18th March 2016
What is cooperation
In a cooperative action
Donor pays cost, c, and recipient gets benefit, b
Costs and benefits are measured in terms of
fitness reproduction can be genetic or cultural
Long standing problem in biological and social
sciences is to understand conditions required for
the emergence and maintenance of cooperation in
evolving populations.
The following mechanisms are proposed
Kin selection : Recognition of kin
Direct reciprocity: repeated interactions, memory
of past actions
Indirect reciprocity: Ability to judge actions (good
or bad) and communicate (language ability)
Spatial selection:
Group selection:
Evolutionary dynamics
• Population (reproductive individuals)
• Mutation (errors in reproduction)
• Selection (selecting fitter types relative to
Evolutionary game theory
Cooperation without reciprocity
Population type : Heterogeneous individuals, i.e. have
different capacity to imitate others’ actions in the
Donor and receivers pairs are randomly picked form
Each individual interact with each other individual
only once. i.e. No two individuals interact more than
After each generation Individuals are updated to the
next generation by synchronously and 10% population
under goes mutations.
Results and discussion
The donation rates depend on populatio
size, ability to copy, benefit and cost val
Our results extends previous literature
cooperation based on image scoring and
tag based cooperation.
The mechanism does not required repe
interactions, therefore memory of past
interactions is required, does not requir
one agent observe and recall/judge acti
of others and communicate to others, a
does not require to reorganization tags.
Individuals with ability to use social
information and ability to copy success
actions of others, the population might
maintain cooperation.
Thank you (for cooperation)