Radial distance determination in the rat vibrissal system and the effects of Weber's law
Identifieur interne : 001C17 ( Ncbi/Checkpoint ); précédent : 001C16; suivant : 001C18Radial distance determination in the rat vibrissal system and the effects of Weber's law
Auteurs : Joseph H. Solomon [États-Unis] ; Mitra J. Z. Hartmann [États-Unis]Source :
- Philosophical Transactions of the Royal Society B: Biological Sciences [ 0962-8436 ] ; 2011.
Abstract
Rats rhythmically tap and brush their vibrissae (whiskers) against objects to tactually explore the environment. To extract a complex feature such as the contour of an object, the rat must at least implicitly estimate
Url:
DOI: 10.1098/rstb.2011.0166
PubMed: 21969686
PubMed Central: 3172605
Affiliations:
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<affiliation wicri:level="1"><nlm:aff id="af2"><addr-line>Department of Biomedical Engineering</addr-line>
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<front><div type="abstract" xml:lang="en"><p>Rats rhythmically tap and brush their vibrissae (whiskers) against objects to tactually explore the environment. To extract a complex feature such as the contour of an object, the rat must at least implicitly estimate <italic>radial object distance</italic>
, that is, the distance from the base of the vibrissa to the point of object contact. Radial object distance cannot be directly measured, however, because there are no mechanoreceptors along the vibrissa. Instead, the mechanical signals generated by the vibrissa's interaction with the environment must be transmitted to mechanoreceptors near the vibrissa base. The first part of this paper surveys the different mechanical methods by which the rat could determine radial object distance. Two novel methods are highlighted: one based on measurement of bending moment and axial force at the vibrissa base, and a second based on measurement of how far the vibrissa rotates beyond initial contact. The second part of the paper discusses the application of Weber's law to two methods for radial distance determination. In both cases, Weber's law predicts that the rat will have greatest sensing resolution close to the vibrissa tip. These predictions could be tested with behavioural experiments that measure the perceptual acuity of the rat.</p>
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