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Titolo:
FREQUENCY-CHARACTERISTICS OF ACCOMMODATION IN A PATIENT WITH AGENESISOF THE POSTERIOR VERMIS AND NORMAL SUBJECTS
Autore:
OHTSUKA K; SAWA M;
Indirizzi:
SAPPORO MED UNIV,SCH MED,DEPT OPHTHALMOL,CHUO KU,S-1,W-16 SAPPORO HOKKAIDO 060 JAPAN
Titolo Testata:
British journal of ophthalmology
fascicolo: 6, volume: 81, anno: 1997,
pagine: 476 - 480
SICI:
0007-1161(1997)81:6<476:FOAIAP>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
RETICULARIS TEGMENTI-PONTIS; PUPILLARY LIGHT REFLEX; LENS ACCOMMODATION; EFFERENT CONNECTIONS; CEREBELLAR CONTROL; HORSERADISH-PEROXIDASE; CORTICAL-NEURONS; AXONAL-TRANSPORT; MACAQUE MONKEY; CAT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
K. Ohtsuka e M. Sawa, "FREQUENCY-CHARACTERISTICS OF ACCOMMODATION IN A PATIENT WITH AGENESISOF THE POSTERIOR VERMIS AND NORMAL SUBJECTS", British journal of ophthalmology, 81(6), 1997, pp. 476-480

Abstract

Aims-To clarify the cerebellar control of accommodation in humans, the frequency characteristics of accommodation were studied in a patientwith agenesis of the posterior cerebellar vermis and four age matchednormal subjects. Methods-Magnetic resonance imaging of the brain of the 29 year old patient showed agenesis of the vermis and paravermis oflobules VIII-X and hypoplasia of the vermis and paravermis of lobulesI-VII, the cerebellar hemisphere, and the cerebellar nuclei, The gainand phase lag of accommodative responses for sinusoidally modulated blur stimuli were calculated for the patient and four normal subjects. The blur stimuli consisted of predictable simple sinusoids of 3.0 dioptres at a frequency of 0.05, 0.1, 0.2, 0.3, 0.5, or 1.0 Hz, Results-The frequency characteristics of accommodative responses in the patient have a larger phase lag and a smaller gain at higher frequencies than those in the four normal subjects. Conclusions-These findings suggest that the cerebellum contributes to the control of accommodation by improving the the frequency characteristics at high frequencies.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 19:51:35