Table 3.

Vocal changes observed in the Japanese quail and oscines.

	Japanese quail	oscines
vocal development (juveniles)
stop insertion	this study	Tchernichovski & Mitra (2002)
increase in spectral complexity of the signal	this study	Tchernichovski et al. (2001) and Derégnaucourt et al. (2005)
inter-individual variability in developmental trajectories	this study	Tchernichovski et al. (2001) and Liu et al. (2004)
regression to earlier ontogenetic stages	this study	Marler & Peters (1982) and Derégnaucourt et al. (2005)
vocal production (adults)
effect of testosterone on pitch	Beani et al. (2000)	Cynx et al. (2005)
overnight changes in the temporal pattern	this study	Hultsch (1980)
Lombard effect	Potash (1972)	Cynx et al. (1998)