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Physical modeling of collective motion in animal groups: Carrying ants
Published on May 03, 20162312 Views
Collectively carrying a heavy load is a hard task and in fact is rarely seen outside ants and humans. Conflicts within the group must be suppressed to succeed with efficient collective transport. Howe
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Chapter list
Groups of animals move collectively00:56
Other examples from nature01:56
Conformism vs Individualism - 102:28
Conformism vs Individualism - 202:48
Ants carrying load to the nest03:51
Collaboration with the group of Dr. Ofer Feinerman (Physics of Complex Systems, Weizman)06:21
Analysis of the experiments06:44
Physical modeling of collective motion in animal groups: carrying ants - 111:05
The model: pullers and lifters - 111:23
The big puzzle: How do they coordinate their pulling efforts ?12:44
Role switching13:01
Individuality vs Conformism17:03
This model fits well the observed dynamics (clean sheet)18:23
Fitted individuality parameter19:34
Ants loose their way to the nest21:12
Optimal response to a single “informed” ant24:48
Equivalent 1D Ising-like model: magnetic spins27:42
Equivalent 1D Ising-like model - 129:13
Equivalent 1D Ising-like model - 229:29
Equivalent 1D Ising-like model - 329:55
The MF solution for the transition30:47
Fully-connected1D Ising-like model: inherently “mean-field”31:28
Response of the 1D spin model for short times32:17
Compare to the actual ants model: Order-disorder transition32:46
But there is an accessible control parameter34:09
Experimental validation35:07
Video - 135:35
Video - 236:53
Why are the ants optimized to this size range ?37:26
What happens when there is an obstacle ?38:52
Appearance of large amplitude oscillations39:14
“Antulum”39:54
Will our model give such oscillations ?41:09
Further comparisons42:23
The model predicts a strong dependence on the size of the system: below a critical size there are no oscillations42:59
The model predicts several phase transitions (or dynamical bifurcations)44:33
And indeed this was then observed45:27
In agreement with the model46:03
The large-amplitude oscillatory mode is a form of collective problem solving - 146:50
The large-amplitude oscillatory mode is a form of collective problem solving - 246:54
Some of this is already published47:20
Why the excitement ?47:23
Conclusion - 147:26
Conclusion - 248:10
What can all this tell us about human society ?48:34
Acknowledgements51:52
Thank you!51:58