Journal of Comparative Physiology A

, Volume 192, Issue 6, pp 573–586

Sensory acquisition in active sensing systems


DOI: 10.1007/s00359-006-0099-4

Cite this article as:
Nelson, M. & MacIver, M. J Comp Physiol A (2006) 192: 573. doi:10.1007/s00359-006-0099-4


A defining feature of active sensing is the use of self-generated energy to probe the environment. Familiar biological examples include echolocation in bats and dolphins and active electrolocation in weakly electric fish. Organisms that utilize active sensing systems can potentially exert control over the characteristics of the probe energy, such as its intensity, direction, timing, and spectral characteristics. This is in contrast to passive sensing systems, which rely on extrinsic energy sources that are not directly controllable by the organism. The ability to control the probe energy adds a new dimension to the task of acquiring relevant information about the environment. Physical and ecological constraints confronted by active sensing systems include issues of signal propagation, attenuation, speed, energetics, and conspicuousness. These constraints influence the type of energy that organisms use to probe the environment, the amount of energy devoted to the process, and the way in which the nervous system integrates sensory and motor functions for optimizing sensory acquisition performance.


Active touchBioluminescenceEcholocationElectrolocationSensory ecology



Jamming avoidance response

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Department of Molecular and Integrative Physiology and The Beckman Institute for Advanced Science and TechnologyUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  2. 2.Department of Mechanical Engineering and Department of Biomedical EngineeringNorthwestern UniversityEvanstonUSA