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Titolo:
Integration of ascending and descending inputs in the auditory midbrain ofanurans
Autore:
Endepols, H; Walkowiak, W;
Indirizzi:
Univ Cologne, Inst Zool, D-50923 Cologne, Germany Univ Cologne Cologne Germany D-50923 Inst Zool, D-50923 Cologne, Germany
Titolo Testata:
JOURNAL OF COMPARATIVE PHYSIOLOGY A-SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY
fascicolo: 12, volume: 186, anno: 2000,
pagine: 1119 - 1133
SICI:
0340-7594(2000)186:12<1119:IOAADI>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
BASAL GANGLIA ORGANIZATION; FIRE-BELLIED TOAD; INFERIOR-COLLICULUS; RANA-CATESBEIANA; TORUS SEMICIRCULARIS; EFFERENT PROJECTIONS; NUCLEUS-ACCUMBENS; PYRAMIDAL NEURONS; NERVOUS-SYSTEM; PREOPTIC AREA;
Keywords:
neuromodulation; forebrain; striatum; thalamus; torus semicircularis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
67
Recensione:
Indirizzi per estratti:
Indirizzo: Walkowiak, W Univ Cologne, Inst Zool, Weyertal 119, D-50923 Cologne, Germany Univ Cologne Weyertal 119 Cologne Germany D-50923 e, Germany
Citazione:
H. Endepols e W. Walkowiak, "Integration of ascending and descending inputs in the auditory midbrain ofanurans", J COMP PH A, 186(12), 2000, pp. 1119-1133

Abstract

In anurans, the midbrain torus semicircularis is involved in auditory processing and audio-motor integration. In this study, we examined the influence of descending forebrain projections on the auditory response properties and hence the audio-motor transmission of mesencephalic interface neurons. In order to investigate response integration, we performed intracellular recordings from torus neurons in an isolated brain preparation of Discoglossuspictus and Bombina orientalis and stimulated the auditory nerve, striatum,and the dorsal thalamus electrically with single pulses. Stimulation of all three sites could evoke responses in torus neurons that were either excitatory, inhibitory, or a mixture of both, with durations of up to several hundred milliseconds. Further, striatum and thalamus were activated by pulse trains (10-20 Hz, 50 pulses) immediately before stimulating the auditory nerve with single pulses. Thus, responses of torus neurons to "auditory" input were facilitated or suppressed for up to 2 min by striatum stimulation oronly suppressed by thalamus stimulation. Intracellular labeling of recorded neurons revealed that response modulation by descending input mostly occurred in laminar nucleus neurons. These results suggest that descending forebrain projections to mesencephalic audiomotor interface neurons may play animportant role in modifying acoustically guided behavior in anurans.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 06:00:28