As the photoperiod increases, the high vocal center ( HVC ) and the robust nucleus of the archistriatum ( RA ) increase in size.
2.
In the case of the Zebra Finch, this articulator is the robust nucleus of archistriatum or RA . The NMDA receptors allow the RA to be more likely to produce this template of the tutor song, thus leading to leaning of the correct song.
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