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Adaptive Lévy processes and area-restricted search in human foraging
Thomas T Hills1, Christopher Kalff, Jan M Wiener
1Department of Psychology, University of Warwick, Coventry, United Kingdom. t.t.hills@warwick.ac.uk
Plos One
|April 12, 2013
Summary
Human foraging search patterns are not accurately described by Lévy processes, especially in patchy environments where area-restricted search is employed. Resource encounter responses are crucial for understanding movement strategies.
Area of Science:
- Behavioral Ecology
- Movement Ecology
- Human Search Behavior
Background:
- Previous research suggested animal foraging follows Lévy flights or walks, characterized by power-law distributed movement lengths.
- Lévy processes, which sample movement independently of past experience, have been questioned due to the effectiveness of resource-sensitive strategies like area-restricted search in patchy environments.
- Area-restricted search can produce heavy-tailed movement distributions, potentially mimicking Lévy processes.
Purpose of the Study:
- To investigate the validity of Lévy processes and resource-sensitive foraging strategies in human search behavior.
- To compare human search patterns in patchy versus dispersed resource environments.
- To determine if movement distributions can infer search strategies without considering resource encounter responses.
Main Methods:
- Tracked human participants searching for hidden resources in a virtual open-field environment.
- Implemented both patchy and dispersed resource distribution conditions.
- Analyzed movement path data using logarithmic binning and rank-frequency methods, including goodness-of-fit tests, and transferred paths between environments.
Main Results:
- Logarithmic binning supported Lévy flights, while rank-frequency methods favored bounded power-law distributions (truncated Lévy flights) in both conditions.
- Goodness-of-fit tests revealed bounded power-law distributions inaccurately characterized movement for most participants (28 out of 32).
- In patchy environments, participants exhibited area-restricted search post-resource encounter, a behavior absent in dispersed environments; paths from patchy environments adapted to that condition.
Conclusions:
- Power-law distributions do not accurately reflect human search behavior.
- Lévy processes may describe movement in dispersed environments but not in patchy environments, where search becomes area-restricted.
- Search strategies cannot be inferred solely from movement distributions; understanding organism response to resources is essential.
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