02062nas a2200205   4500008004100000022001400041245013900055210006900194260001600263300001400279490000800293520137200301653002401673653001201697653002101709653002101730653002101751100002901772856005501801       2018                        eng d  a0340-759400aEvolutionarily conserved coding properties favour the neuronal representation of heterospecific signals of a sympatric katydid species0 aEvolutionarily conserved coding properties favour the neuronal r  cJan-10-2018  a859 - 8720 v2043 a<p>To function as a mechanism in premating isolation, the divergent and species-specific calling songs of acoustic insects must be reliably processed by the afferent auditory pathway of receivers. Here, we analysed the responses of interneurons in a katydid species that uses long-lasting acoustic trills and compared these with previously reported data for homologous interneurons of a sympatric species that uses short chirps as acoustic signals. Some interneurons of the trilling species respond exclusively to the heterospecific chirp due to selective, low-frequency tuning and &ldquo;novelty detection&rdquo;. These properties have been considered as evolutionary adaptations in the sensory system of the chirper, which allow it to detect signals effectively during the simultaneous calling of the sympatric sibling species. We propose that these two mechanisms, shared by the interneurons of both species, did not evolve in the chirper to guarantee its ability to detect the chirp under masking conditions. Instead we suggest that chirpers evolved an additional, 2-kHz component in their song and exploited pre-existing neuronal properties for detecting their song under masking noise. The failure of some interneurons to respond to the conspecific song in trillers does not prevent intraspecific communication, as other interneurons respond to the trill.</p>
10aAuditory processing10ainsects10aSelective coding10asignal detection10asignal evolution1 aKostarakos, Konstantinos  uhttp://link.springer.com/10.1007/s00359-018-1282-0