Analysis of indirect auditory pathways to the song control system of
the zebra finch with biotinylated dextran amine (BDA)

Lim, Dukhwan

doi:2011.7.1.60

Audiol > Volume 7(1); 2011 > Article

Research Paper

Audiology 2011;7(1): 60-63.
Published online: June 30, 2011.
doi: http://doi.org/10.21848/audiol.2011.7.1.60

Biotinylated dextran amine (BDA)를 응용한 금화조 song control 시스템의 간접 청각 입력 경로 분석

임덕환

한림대 언어청각학부, 청각언어연구소

Analysis of indirect auditory pathways to the song control system of the zebra finch with biotinylated dextran amine (BDA)

Dukhwan Lim

Section of Audiology, Audiology and Speech Pathology Research Institute, Hallym University, ChunChon, South Korea

Correspondence

Dukhwan Lim ,Tel: 033) 248-2217, Fax: 02) 6280-9133, Email: dlim@hallym.ac.kr

Received: May 3, 2011; Revised: June 4, 2011 Accepted: June 14, 2011. Published online: June 30, 2011.

ABSTRACT

The zebra finch (Poephila guttata) has been known to have the nuclei of the song control system which contain highly selective neurons. They respond exclusively to a bird’s own song. The mechanism for this song selectivity is critical in understanding song-related behaviors such as vocal learning and memory. Though important advancement has been continued in this area, the exact nature of functional and anatomical correlates are still under investigation. In this retrospective study, local areas of field L, especially L2, were traced with a new modified application protocol of biotinylated dextran amine (BDA) to examine how general auditory inputs were anatomically connected to the song control system (HVc, hyperstriatum ventral pars caudalis) in the forebrain of the adult male zebra finch. The injection of BDA tracer was controlled to be confined within the L2 area (N=3) and connections were traced in both retrograde and anterograde directions. The data confirmed that Field L2 area provided the input to the shelf area of the HVc instead of direct connections to the HVc proper. Thus, song selectivity appeared to be achieved indirectly with the addition of at least one more processing stage (shelf) between L2 and HVc.

Key Words: biotinylated dextran amine (BDA), Field L, L2, HVc, selectivity, song control system, zebra finch.

중심단어: 금화조, 선택도, biotinylated dextran amine (BDA), Field L, L2, HVc, song control system.