# Contact Hypothesis Model

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globals [ ] breed [ group-a-members group-a-member ] breed [ group-b-members group-b-member ] group-a-members-own [ crossing-allowed? prejudice ] group-b-members-own [ crossing-allowed? prejudice ] to setup clear-all ; Draw the horizontal line ask patches with [pycor = 0] [ set pcolor green ] create-group-a-members group-a-size [ set color gray set shape "person" set size 1.5 set crossing-allowed? (random-float 1 <= percentage-a-cross) set prejudice 1 + random 10 setxy random-xcor (min-pycor + 1 + random (abs 0 - min-pycor - 1)) ] create-group-b-members group-b-size [ set color orange set shape "person" set size 1.5 set crossing-allowed? (random-float 1 <= percentage-b-cross) set prejudice 1 + random 10 setxy random-xcor (1 + random (abs max-pycor - 1)) ] reset-ticks end to update-plot [mean-prejudice-a mean-prejudice-b] set-current-plot "Mean Prejudice Levels" set-current-plot-pen "group-a" plot mean-prejudice-a set-current-plot-pen "group-b" plot mean-prejudice-b end to go ask turtles [ move interact ] let mean-prejudice-a mean [prejudice] of group-a-members let mean-prejudice-b mean [prejudice] of group-b-members update-plot mean-prejudice-a mean-prejudice-b tick end to move let old-xcor xcor let old-ycor ycor rt random 50 - 25 if can-move? 1 [ fd 1 ] ifelse breed = group-a-members [ if ycor >= 0 and not crossing-allowed? [ setxy old-xcor old-ycor ] ] [ if ycor <= 0 and not crossing-allowed? [ setxy old-xcor old-ycor ] ] end to interact let other-turtle one-of other turtles-here if other-turtle != nobody [ ifelse breed = group-a-members [ if [breed] of other-turtle = group-b-members [ if prejudice < interaction-threshold [ set prejudice prejudice - (prejudice * prejudice-reduction-factor) ask other-turtle [ set prejudice prejudice - (prejudice * prejudice-reduction-factor) ] ] ] ] [ if [breed] of other-turtle = group-a-members [ if prejudice < interaction-threshold [ set prejudice prejudice - (prejudice * prejudice-reduction-factor) ask other-turtle [ set prejudice prejudice - (prejudice * prejudice-reduction-factor) ] ] ] ] ] end

There is only one version of this model, created about 1 year ago by Charis Psaltis.

## Attached files

File | Type | Description | Last updated | |
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Contact Hypothesis Model.png | preview | Preview of Interface | about 1 year ago, by Charis Psaltis | Download |

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