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Titolo:
REPRESENTATION OF INTERAURAL LEVEL DIFFERENCE IN THE VLVP, THE FIRST SITE OF BINAURAL COMPARISON IN THE BARN OWLS AUDITORY-SYSTEM
Autore:
MOGDANS J; KNUDSEN EI;
Indirizzi:
TH DARMSTADT,INST ZOOL,SCHNITTSPAHNSTR 3 D-64287 DARMSTADT GERMANY STANFORD UNIV,SCH MED,DEPT NEUROBIOL STANFORD CA 94305
Titolo Testata:
Hearing research
fascicolo: 1-2, volume: 74, anno: 1994,
pagine: 148 - 164
SICI:
0378-5955(1994)74:1-2<148:ROILDI>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
UNIT EXCITATORY RESPONSES; SUPERIOR OLIVARY COMPLEX; LATERAL LEMNISCUS; DORSAL NUCLEUS; OPTIC TECTUM; INTENSITY DIFFERENCES; COCHLEAR NUCLEUS; TONE BURSTS; NEURAL MAP; BRAIN-STEM;
Keywords:
NUCLEUS OF THE LATERAL LEMNISCUS; LATERAL SUPERIOR OLIVE; NEURAL MAPS; SOUND LOCALIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
J. Mogdans e E.I. Knudsen, "REPRESENTATION OF INTERAURAL LEVEL DIFFERENCE IN THE VLVP, THE FIRST SITE OF BINAURAL COMPARISON IN THE BARN OWLS AUDITORY-SYSTEM", Hearing research, 74(1-2), 1994, pp. 148-164

Abstract

In the avian auditory system, the posterior division of the ventral nucleus of the lateral lemniscus (VLVp) is the first site where the levels of sound arriving at the two ears art compared. VLVp units are excited by sound at the contralateral ear and are inhibited by sound at the ipsilateral ear, and, as a result, are sensitive to interaural level differences (ILD). In this study, we investigate the functional properties of VLVp units and describe the topography of ILD sensitivity along the dorsoventral dimension of this nucleus. The responses of VLVp units were tested with monaural and binaural noise delivered through earphones. Excitatory and inhibitory responsiveness was quantified using several measures that assessed the effect of contra-ear stimulation and the effect of ipsi-ear stimulation on the contra-ear response. On the basis of these measures, we characterize the map of ILD sensitivity in the VLVp. The temporal pattern of unit responses were also analyzed. The discharges of VLVp units were regular and time-locked to the onset of a stimulus, a pattern of discharge reminiscent of the 'chopperpattern' observed in the lateral superior olive (LSO) of mammals. Thetemporal discharge patterns of a single VLVp neuron often distinguished between equivalent ILDs, resulting from different combinations of contra- and ipsi-ear levels, that were not distinguished by spike countalone. However, the temporal response pattern did not distinguish between all such combinations of contra- and ipsi-ear levels. The additional information was encoded by the pattern of activity across the entire population of VLVp neurons. This study describes similarities in the functional properties of VLVp and LSO units that suggest similar physiological mechanisms in avians and mammals for encoding similar acoustic information.

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Documento generato il 29/11/20 alle ore 16:30:46