Dd. Gehr et al., Functional changes in field L complex during song development of juvenile male zebra finches, DEV BRAIN R, 125(1-2), 2000, pp. 153-165
The field L complex is the highest station of the ascending auditory pathwa
y and is thought to be the input stage of auditory information into the son
g system in birds. Multi-unit recordings were performed in awake, socially
reared zebra finches, 30 and 60 days of age. The responses of the field L c
omplex to synthetic and natural stimuli during important periods of song le
arning were investigated. According to neural responses in field L, three d
ifferent functional areas could be distinguished, NA-L-30, NA2b(30) and NA2
c(30,) in 30 days old birds. In 60 days old birds five different functional
areas, NA-L-60, NA2a(60,) NA2b(60), NA2c(60) and NA3(60), were recognised.
Especially, NA-L increases its functional volume between the developmental
stages. The different areas showed already mature neuronal response behavi
ours. No preference for a certain song type could be found at all ages. The
incomplete functional organisation of the field L complex in young birds (
30 days) is a possible reason for the nonselectivity in the song system at
this age. (C) 2000 Elsevier Science B.V. All rights reserved.