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Titolo:
Tonotopic organization and parcellation of auditory cortex in the FM-bat Carollia perspicillata
Autore:
Esser, KH; Eiermann, A;
Indirizzi:
Univ Ulm, Abt Neurobiol, D-89069 Ulm, Germany Univ Ulm Ulm Germany D-89069 iv Ulm, Abt Neurobiol, D-89069 Ulm, Germany
Titolo Testata:
EUROPEAN JOURNAL OF NEUROSCIENCE
fascicolo: 10, volume: 11, anno: 1999,
pagine: 3669 - 3682
SICI:
0953-816X(199910)11:10<3669:TOAPOA>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
FUNCTIONAL-ORGANIZATION; FREQUENCY REPRESENTATION; PHYLLOSTOMUS DISCOLOR; ARCHITECTONIC FIELDS; SENSITIVE NEURONS; EPTESICUS-FUSCUS; MYOTIS-LUCIFUGUS; MUSTACHED BAT; HORSESHOE BAT; PURE-TONE;
Keywords:
electrophysiological mapping; frequency representation; hearing; neural audiogram; short-tailed fruit bat;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Esser, KH Univ Ulm, Abt Neurobiol, Albert Einstein Allee 11, D-89069 Ulm, Germany Univ Ulm Albert Einstein Allee 11 Ulm Germany D-89069 , Germany
Citazione:
K.H. Esser e A. Eiermann, "Tonotopic organization and parcellation of auditory cortex in the FM-bat Carollia perspicillata", EUR J NEURO, 11(10), 1999, pp. 3669-3682

Abstract

In the short-tailed fruit bat (Carollia perspicillata), the auditory cortex was localized autoradiographically and studied electrophysiologically in detail by using metal microelectrodes and 10-ms tone stimuli. Because, in the weakly-anaesthetized preparation, neuronal responses to pure-tones were even found throughout the non-primary auditory cortex, characteristic frequencies and minimum thresholds of neuron clusters (multiunits) could be mapped consistently and used to define auditory cortical fields conventionally (ie. as in studies of auditory cortex of non-echolocating mammals). Thus, within th electrophysiologically demarcated auditory cortex, six auditor fields were defined by criteria, as for example a gradient of characteristic frequencies (primary auditory cortex, Al; anterior auditory field; AAF; secondary auditory cortex, AII), reversal of the gradient across the field border (AI, AAF), uniform representation of a restricted band of frequencies (i.e. >60 kHz high-frequency fields I and II, HFI and HFII), and transition from low to high minimum threshold or vice versa [dorsoposterior field (DP),AII, HFI HFII]. As supportive evidence for the distinction of these auditory cortical fields, differences in neuronal response properties were also used. In comparison with other mammals (e.g. cat and mouse), both the relative position of the auditory fields (mainly Al, AAF, DP and AII) and the representational principles for sound parameters within these forebrain areas seem to reflect a 'fundamental plan' (discussion below) of mammalian auditory cortical organization. Two coherent dorsally displaced high-frequency representations (HFI, HFII) covering similar to 40% of the total auditory cortical surface seem particularly suited for the processing of the dominant biosonar second and third harmonic of this species, and hence can be regarded as an adaptation for echolocation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 01:45:11