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Random-walk chemotaxis: trial and error as a control process.

R S Marken1, W T Powers

  • 1Aerospace Corporation, El Segundo, California 90245-4691.

Behavioral Neuroscience
|December 1, 1989
PubMed
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Escherichia coli uses biased random-walk chemotaxis for navigation, a strategy also observed in humans. This navigation relies on internal selection of responses, not environmental cues.

Area of Science:

  • Microbiology
  • Behavioral Science
  • Biophysics

Background:

  • Escherichia coli exhibits biased random-walk chemotaxis for effective navigation.
  • This bacterial navigation strategy involves trial-and-error responses rather than directed steering.
  • Similar navigation capabilities have been observed in humans employing analogous response modes.

Purpose of the Study:

  • To model the biased random-walk chemotaxis of Escherichia coli.
  • To explore the underlying control mechanisms of this navigation strategy.
  • To investigate the parallels between bacterial chemotaxis and human navigation.

Main Methods:

  • Modeling navigation as an input control process.
  • Analyzing the selective retention of favorable response consequences.

Related Experiment Videos

  • Examining the rejection of unfavorable response consequences.

    • Main Results:

    • The navigation model effectively captures the biased random-walk chemotaxis.
    • Selective retention and rejection of responses are key to navigation.
    • Internal system organization, not external environmental factors, drives the selection process.

    Conclusions:

    • Bacterial chemotaxis provides a model for understanding navigation through biased random walks.
    • Human navigation can share principles with simple bacterial chemotaxis.
    • Internal control mechanisms are crucial for adaptive navigation in response to environmental stimuli.