𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Auditory responses in the vocal motor system of budgerigars

✍ Scribed by Plummer, Thane K. ;Striedter, Georg F.


Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
300 KB
Volume
42
Category
Article
ISSN
0022-3034

No coin nor oath required. For personal study only.

✦ Synopsis


Budgerigars (Melopsittacus undulatus) are small Australian parrots that can imitate novel sounds in adulthood and therefore serve as a convenient model system for the study of vocal learning in adult animals. Previous anatomical studies had indicated that known auditory regions in the telencephalon of budgerigars are connected, albeit indirectly and rather sparsely, to vocal motor nuclei. Physiological evidence for connections between the auditory and vocal motor systems in budgerigars had been lacking, however. Here, we show that neurons in a telencephalic vocal motor region, i.e., the central nucleus of the lateral neostriatum (NLc), are responsive to auditory stimuli in isoflurane-anesthetized budgerigars. These responses are highly variable from trial to trial and frequently have latencies in excess of 100 ms. Neurons in NLc generally respond better to a budgerigar's own contact call than to a white noise stimulus, but the response preferences of NLc neurons in budgerigars are generally weaker and more diverse than the response preferences of neurons in the high vocal center of songbirds, which is probably analogous to NLc. These data indicate that parrots and songbirds, which have evolved the ability to learn vocalizations independently of one another, have both evolved physiologically effective connections between their auditory and vocal motor systems. Interestingly, however, the anatomical pathways by which the auditory and vocal motor systems interact, and the physiological details of how they communicate, appear to be significantly different between the two taxa.


πŸ“œ SIMILAR VOLUMES


Lesions in the budgerigar vocal control
✍ Lavenex, Pamela Banta πŸ“‚ Article πŸ“… 2000 πŸ› John Wiley and Sons 🌐 English βš– 905 KB

This study investigates the role of the psittacid (parrot) central nucleus of the lateral neostriatum (NLc) in the production of learned English and natural vocalizations. Anatomic data have led researchers to define NLc alternately as the parrot homologue (Paton et al. [1981] J Neurosci. 11:1279 -1

Lability in the responses of cells in th
✍ I. Glass; Z. Wollberg πŸ“‚ Article πŸ“… 1979 πŸ› Springer-Verlag 🌐 English βš– 656 KB

The activity of 28 cells located mainly in the secondary auditory cortex (A II) of awake squirrel-monkeys, was extracellularly recorded for periods of up to 6 h. Seven different species-specific vocalizations, which were repeatedly presented to the monkey, were used as auditory stimuli. Twenty-six c