Figure 27.

Columns of EGR1 and DUSP1 activity-dependent gene expression in the songbird brain. A,B: Example of basal expression in an awake zebra finch, sitting still in the dark (Feenders et al., 2008; Horita et al., 2012). C,D: Example of hearing induced gene expression in a zebra finch that heard playbacks of three different conspecific songs, totaling 12 seconds in length, presented once every minute for 30 minutes (Feenders et al., 2008; Horita et al., 2012). E,F: Example of light induced gene expression in the visual pathway of the ventral pallium from a sitting still zebra finch stimulated with daylight for 1 hour after an overnight period of darkness (Mouritsen et al., 2005; Feenders et al., 2008). G,H: Example of induced gene expression in three columns: the visual pathway of the dorsal pallium, the adjacent anterior somatosensory pathway of the dorsal pallium, and a motor activated region of the ventral pallium surrounding the song nuclei in a zebra finch male that hopped around a cylindrical cage for ~30 minutes with lights on (Feenders et al., 2008; Horita et al., 2010). I,J: Example of hopping induced gene expression in the dorsal pallium somatosensory pathway and the ventral pallium motor regions surrounding the song nuclei in a deaf male zebra finch that hopped in a rotating wheel with lights off (Feenders et al., 2008; Horita et al., 2010). K,L: Example of dim-light, magnetic vision-induced gene expression in a light-dependent magnetic compass sensing column (Cluster N) of the dorsal pallium found in night-migrating garden warblers (Mouritsen et al., 2005). M,N: Example of hopping induced gene expression in a similar treated animal, but in a more medial part of the dorsal pallial somatosensory pathway (Horita et al., 2010). O,P: Example of singing induced gene expression in song nuclei of a male zebra finch that sang for 30 minutes and made some hopping movements in between singing bouts (Horita et al., 2012). Q: Example of a column of activation in N and MV of unknown function located between the known visual and somatosensory pathways of the ventral pallium, in a zebra finch that sat still perched in the dark for 30 minutes while awake. Scale bar = 1 mm.