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Titolo:
Age-related temporal processing speed deterioration in auditory cortex
Autore:
Mendelson, JR; Ricketts, C;
Indirizzi:
Univ Toronto, Fac Med, Dept Speech Language Pathol, Toronto, ON M5S 3H2, Canada Univ Toronto Toronto ON Canada M5S 3H2 athol, Toronto, ON M5S 3H2, Canada
Titolo Testata:
HEARING RESEARCH
fascicolo: 1-2, volume: 158, anno: 2001,
pagine: 84 - 94
SICI:
0378-5955(200108)158:1-2<84:ATPSDI>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
INFERIOR COLLICULUS; FUNCTIONAL TOPOGRAPHY; RESPONSE PROPERTIES; EVOKED POTENTIALS; RHESUS-MONKEY; NEURONS; RAT; SWEEPS; YOUNG; TIME;
Keywords:
aging; frequency-modulated sweep; auditory cortex;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Mendelson, JR Univ Toronto, Fac Med, Dept Speech Language Pathol, Tanz Neurosci Bldg,6 Queens Pk Cres W, Toronto, ON M5S 3H2, Canada Univ Toronto Tanz Neurosci Bldg,6 Queens Pk Cres W Toronto ON Canada M5S 3H2
Citazione:
J.R. Mendelson e C. Ricketts, "Age-related temporal processing speed deterioration in auditory cortex", HEARING RES, 158(1-2), 2001, pp. 84-94

Abstract

A common problem among the elderly is a difficulty in discriminating speech sounds. One factor that may contribute to this is a deterioration in the ability to process dynamic aspects of speech such as formant transitions. For the aging auditory system, this deterioration in temporal processing speed may be manifest as a deficit in encoding time-varying sounds that contain rapidly changing frequencies such as formant transitions. The primary goal of this study was to explore the neural basis of the effects of aging on temporal processing speed. To this end, single units were recorded from theauditory cortex of young and aged rats in response to frequency-modulated (FM) sweeps that changed from trial to trial in both direction and speed. Results showed that the majority of cells recorded from young rats respondedmost vigorously to fast and medium speeds. By contrast, the majority of units recorded from aged animals responded best to slow speeds. For preferreddirection of FM sweep, similar results were observed for both age groups, namely, approximately half of the units exhibited a direction-selective response. The results of the present study demonstrate an age-related decreasein the rate of change of frequency that can be processed by the auditory cortex. (C) 2001 Published by Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/01/20 alle ore 10:54:11