Body postures and patterns as amplifiers of physical condition

P. W. Taylor, O. Hasson, D. L. Clark*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)


The question of why receivers accept a selfish signaller's message as reliable or 'honest' has fuelled ample controversy in discussions of communication. The handicap mechanism is now widely accepted as a potent constraint on cheating. Handicap signals are deemed reliable by their costs: signallers must choose between investing in the signal or in other aspects of fitness. Accordingly, resources allocated to the signal come to reflect the signaller's fitness budget and, on average, cheating is uneconomic. However, that signals may also be deemed reliable by their design, regardless of costs, is not widely appreciated. Here we briefly describe indices and amplifiers, reliable signals that may be essentially cost free. Indices are reliable because they bear a direct association with the signalled quality rather than costs. Amplifiers do not directly provide information about signaller quality, but they facilitate assessment by increasing the apparency of pre-existing cues and signals that are associated with quality. We present results of experiments involving a jumping spider (Plexippus paykulli) to illustrate how amplifiers can facilitate assessment of cues associated with physical condition without invoking the costs required for handicap signalling.

Original languageEnglish
Pages (from-to)917-922
Number of pages6
JournalProceedings of the Royal Society B: Biological Sciences
Issue number1446
Publication statusPublished - 7 May 2000
Externally publishedYes


  • Amplifier
  • Handicap
  • Index
  • Salticidae
  • Signalling
  • Spider


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