Fwd: [Activities-announce] Reminder -Seminar Tuesday, February 10, 12:15-1:15 p.m., Robert Axelrod and Ross A. Hammond, "The Evolution of Ethnocentric Behavior"

[Owen Densmore]

Is anyone going to this?  I plan to attend by phone from San Diego:

Begin forwarded message:

From: Ginny Greninger <[hidden email]>
Date: February 10, 2004 8:42:58 AM MST
To: [hidden email]
Cc: Subject: [Activities-announce] Reminder -Seminar Tuesday, February
10, 12:15-1:15 p.m., Robert Axelrod and  Ross A. Hammond,  "The
Evolution of Ethnocentric Behavior"

REMINDER SEMINAR TODAY

***SFI Seminar Tuesday, February 10, 2004, 12:15-1:15pm***

Location: Medium Conference Room

Title:   "The Evolution of Ethnocentric Behavior "

Speakers:  Robert Axelrod and Ross A. Hammond

Affiliation: Department of Political Science and the Gerald R. Ford
School of Public Policy, University of Michigan


*** Abstract: ***
http://www.santafe.edu/sfi/events/abstract/166

[Stephen Guerin]

Carl and I are heading up...Two extra seats.

-Steve

____________________________________________________
http://www.redfish.com    [hidden email]
624 Agua Fria Street      office: [phone]
Santa Fe, NM 87501        mobile: [phone]

> -----Original Message-----
> From: Owen Densmore [mailto:[hidden email]]
> Sent: Tuesday, February 10, 2004 11:10 AM
> To: The Friday Morning Applied Complexity Coffee Group
> Subject: [FRIAM] Fwd: [Activities-announce] Reminder -Seminar
> Tuesday,February 10, 12:15-1:15 p.m., Robert Axelrod and Ross A.
> Hammond,"The Evolution of Ethnocentric Behavior"
>
>
> Is anyone going to this?  I plan to attend by phone from San Diego:
>
> Begin forwarded message:
>
> From: Ginny Greninger <[hidden email]>
> Date: February 10, 2004 8:42:58 AM MST
> To: [hidden email]
> Cc: Subject: [Activities-announce] Reminder -Seminar Tuesday, February
> 10, 12:15-1:15 p.m., Robert Axelrod and  Ross A. Hammond,  "The
> Evolution of Ethnocentric Behavior"
>
> REMINDER SEMINAR TODAY
>
> ***SFI Seminar Tuesday, February 10, 2004, 12:15-1:15pm***
>
> Location: Medium Conference Room
>
> Title:   "The Evolution of Ethnocentric Behavior "
>
> Speakers:  Robert Axelrod and Ross A. Hammond
>
> Affiliation: Department of Political Science and the Gerald R. Ford
> School of Public Policy, University of Michigan
>
>
> *** Abstract: ***
> http://www.santafe.edu/sfi/events/abstract/166
>
>
> ============================================================
> FRIAM Applied Complexity Group listserv
> Meets Fridays 9AM @ Jane's Cafe
> Lecture schedule, archives, unsubscribe, etc.:
> http://www.friam.org
>
>

[Owen Densmore]

I fucked up the time difference so missed the talk.  Anyone got a
summary?!

Damn I hate traveling.

Owen

On Feb 10, 2004, at 11:27 AM, Stephen Guerin wrote:

> Carl and I are heading up...Two extra seats.
>
> -Steve
>
> ____________________________________________________
> http://www.redfish.com    [hidden email]
> 624 Agua Fria Street      office: [phone]
> Santa Fe, NM 87501        mobile: [phone]
>
>> -----Original Message-----
>> From: Owen Densmore [mailto:[hidden email]]
>> Sent: Tuesday, February 10, 2004 11:10 AM
>> To: The Friday Morning Applied Complexity Coffee Group
>> Subject: [FRIAM] Fwd: [Activities-announce] Reminder -Seminar
>> Tuesday,February 10, 12:15-1:15 p.m., Robert Axelrod and Ross A.
>> Hammond,"The Evolution of Ethnocentric Behavior"
>>
>>
>> Is anyone going to this?  I plan to attend by phone from San Diego:
>>
>> Begin forwarded message:
>>
>> From: Ginny Greninger <[hidden email]>
>> Date: February 10, 2004 8:42:58 AM MST
>> To: [hidden email]
>> Cc: Subject: [Activities-announce] Reminder -Seminar Tuesday, February
>> 10, 12:15-1:15 p.m., Robert Axelrod and  Ross A. Hammond,  "The
>> Evolution of Ethnocentric Behavior"
>>
>> REMINDER SEMINAR TODAY
>>
>> ***SFI Seminar Tuesday, February 10, 2004, 12:15-1:15pm***
>>
>> Location: Medium Conference Room
>>
>> Title:   "The Evolution of Ethnocentric Behavior "
>>
>> Speakers:  Robert Axelrod and Ross A. Hammond
>>
>> Affiliation: Department of Political Science and the Gerald R. Ford
>> School of Public Policy, University of Michigan
>>
>>
>> *** Abstract: ***
>> http://www.santafe.edu/sfi/events/abstract/166
>>
>>
>> ============================================================
>> FRIAM Applied Complexity Group listserv
>> Meets Fridays 9AM @ Jane's Cafe
>> Lecture schedule, archives, unsubscribe, etc.:
>> http://www.friam.org
>>
>>
>
> ============================================================
> FRIAM Applied Complexity Group listserv
> Meets Fridays 9AM @ Jane's Cafe
> Lecture schedule, archives, unsubscribe, etc.:
> http://www.friam.org
>

Owen Densmore          908 Camino Santander       Santa Fe, NM 87505
[hidden email]    Cell: 505-570-0168         Home: 505-988-3787
AIM:owendensmore   http://complexityworkshop.com  http://backspaces.net

[Stephen Guerin]

Owen,

Pretty interesting non-iterated prisoner's dilemma grid model where
ethnocentric behavior is a robust result. Agents compete to reproduce to
empty adjacent grid cells.  Ethnocentric strategy is defined as cooperating
with your in-group and defecting from your outgroup. You can get the paper
and the animation at the bottom of Axelrod's web page:
http://www-personal.umich.edu/~axe/

>From the paper, the model description is:

------------

"The model is very simple. An individual agent has three traits. The first
trait is a tag that specifies its group membership as one of four colors.2
The second and third traits specify the agent's strategy. The second trait
specifies whether the agent cooperates or defects when meeting someone of
its own color. The third trait specifies whether the agent cooperates or
defects when meeting an agent of a different color. In this model, an
ethnocentric strategy is one that cooperates with an agent of ones own
color, and defects with others. Thus only one of the four possible
strategies is ethnocentric. The other strategies are cooperate with
everyone, defect with everyone, and cooperate only with agents of a
different color. Since the tags and strategies are not linked, the model
allows for the possibility of "cheaters" who can be free riders in the group
whose tag they carry.

The simulation begins with an empty space of 50x50 sites. The space has wrap
around borders so that each site has exactly four neighboring sites. Each
time period consists of four stages: immigration, interaction, reproduction,
and death.
        1. An immigrant with random traits enters at a random empty site.
        2. Each agent receives a initial value of 12% as its Potential To Reproduce
(PTR). Each pair of adjacent agents interacts in a one-move Prisoner's
Dilemma in which each chooses whether or not to help the other. Giving help
has a cost, namely a decrease in the agent's PTR by 1%. Receiving help has a
benefit, namely an increase in the agent's PTR by 3%.
        3. Each agent is chosen in a random order and given a chance to reproduce
with probability equal to its PTR. Reproduction is asexual and consists of
creating an offspring in an adjacent empty site, if there is one. An
offspring receives the traits of its parent, with a mutation rate of 0.5%
per trait.
        4. Each agent has a 10% chance of dying, making room for future offspring.

In the default model there's 3 genes/traits in the genome.
        1) Color
        2) Defect or Cooperate with adjacent cells of same color
        3) Defect or Cooperate with adjacent cells with different color

------------

One thing nagging me about the model is that I have the feeling that
ethnocentricity is built into the rules. One would expect the system to use
the potential symmetry break between traits 2 and 3 to form reinforcing
cooperative structures to take advantage of the asymetry in the cost/benefit
in PTR (1% cost to cooperate vs. 3% benefit to cooperate). I think it would
have been more interesting if ethnocentricity evolved if the traits of the
agents were unbiased like:
        1) Color
        2) Cooperate with no color or a specific color
        3) Defect with no color or a specific color

-Steve

____________________________________________________
http://www.redfish.com    [hidden email]
624 Agua Fria Street      office: [phone]
Santa Fe, NM 87501        mobile: [phone]

> -----Original Message-----
> From: Owen Densmore [mailto:[hidden email]]
> Sent: Tuesday, February 10, 2004 1:55 PM
> To: The Friday Morning Applied Complexity Coffee Group
> Subject: Re: [FRIAM] Fwd: [Activities-announce] Reminder -Seminar
> Tuesday,February 10, 12:15-1:15 p.m., Robert Axelrod and Ross A.
> Hammond,"The Evolution of Ethnocentric Behavior"
>
>
> I fucked up the time difference so missed the talk.  Anyone got a
> summary?!
>
> Damn I hate traveling.
>
> Owen
>
> On Feb 10, 2004, at 11:27 AM, Stephen Guerin wrote:
>
> > Carl and I are heading up...Two extra seats.
> >
> > -Steve
> >
> > ____________________________________________________
> > http://www.redfish.com    [hidden email]
> > 624 Agua Fria Street      office: [phone]
> > Santa Fe, NM 87501        mobile: [phone]
> >
> >> -----Original Message-----
> >> From: Owen Densmore [mailto:[hidden email]]
> >> Sent: Tuesday, February 10, 2004 11:10 AM
> >> To: The Friday Morning Applied Complexity Coffee Group
> >> Subject: [FRIAM] Fwd: [Activities-announce] Reminder -Seminar
> >> Tuesday,February 10, 12:15-1:15 p.m., Robert Axelrod and Ross A.
> >> Hammond,"The Evolution of Ethnocentric Behavior"
> >>
> >>
> >> Is anyone going to this?  I plan to attend by phone from San Diego:
> >>
> >> Begin forwarded message:
> >>
> >> From: Ginny Greninger <[hidden email]>
> >> Date: February 10, 2004 8:42:58 AM MST
> >> To: [hidden email]
> >> Cc: Subject: [Activities-announce] Reminder -Seminar Tuesday, February
> >> 10, 12:15-1:15 p.m., Robert Axelrod and  Ross A. Hammond,  "The
> >> Evolution of Ethnocentric Behavior"
> >>
> >> REMINDER SEMINAR TODAY
> >>
> >> ***SFI Seminar Tuesday, February 10, 2004, 12:15-1:15pm***
> >>
> >> Location: Medium Conference Room
> >>
> >> Title:   "The Evolution of Ethnocentric Behavior "
> >>
> >> Speakers:  Robert Axelrod and Ross A. Hammond
> >>
> >> Affiliation: Department of Political Science and the Gerald R. Ford
> >> School of Public Policy, University of Michigan
> >>
> >>
> >> *** Abstract: ***
> >> http://www.santafe.edu/sfi/events/abstract/166
> >>
> >>
> >> ============================================================
> >> FRIAM Applied Complexity Group listserv
> >> Meets Fridays 9AM @ Jane's Cafe
> >> Lecture schedule, archives, unsubscribe, etc.:
> >> http://www.friam.org
> >>
> >>
> >
> > ============================================================
> > FRIAM Applied Complexity Group listserv
> > Meets Fridays 9AM @ Jane's Cafe
> > Lecture schedule, archives, unsubscribe, etc.:
> > http://www.friam.org
> >
>
> Owen Densmore          908 Camino Santander       Santa Fe, NM 87505
> [hidden email]    Cell: 505-570-0168         Home: 505-988-3787
> AIM:owendensmore   http://complexityworkshop.com  http://backspaces.net
>
>
> ============================================================
> FRIAM Applied Complexity Group listserv
> Meets Fridays 9AM @ Jane's Cafe
> Lecture schedule, archives, unsubscribe, etc.:
> http://www.friam.org
>
>