Effect of lesion of nucleus robustus archistriatalis on call in bramble finch (Fringilla montifringilla)

The lesion of nucleus robustus archistriatalis (RA) has no effect on normal short calls in the bramble finch, but affects significantly the temporal a nd acoustic features of learned long calls. It causes the principal frequen cy of basic sound in monotone long calls to increase 500 cents, and to lose two upper partials. The lesion of RA not only results in the increased sou nd length of loud-sound and shortened coda of variable-tone long calls by 1 3.4%-22.1% and 21.2%-24.2% on average, respectively, but also makes the fre quency rising coefficient (FRC) of even order partial tone in loud-sound dr op 18.5%-25.8% on an average, and the step-up rate decrease 22.7%-24.0% on an average with the increase of frequencies. These results show that the co ntrol of temporal and frequency features of learned calls by RA matches to each other. Moreover, the lesion of bilateral RA can confuse the vocal patt ern, and the produced long call has the character of both the mono- and var iable-tone long calls. The prelude shows rising frequency, and the loud sou nd is monotone sound.