National Repository of Grey Literature 246 records found  beginprevious237 - 246  jump to record: Search took 0.01 seconds. 
Suppression of 2f1-f2 distortion product otoacoustic emissions by electrical stimulation of the inferior colliculus in guinea pigs
Popelář, Jiří ; Mazelová, Jana ; Syka, Josef
Electrical stimulation of certain parts of the IC resulted in the depression of the DPOAE amplitude by 0.1-2 dB. The value of maximal DPOAE suppression was similar to the DPOAE suppression produced by acoustical stimulation of the contralateral ear. Our results indicate that electrical stimulation of the external cortex of the IC can activate the efferent system and produce DPOAE suppression by similar mechanisms as does acoustical stimulation of the contralateral ear.
A behavioral and electrophysiological study of the effects of noise exposure on auditory function in rat
Rybalko, Natalia ; Mazelová, Jana ; Syka, Josef
The values of the gap detection threshold doubled after exposure to 110 dB SPL and quadrupled after exposure to 115-120 dB SPL. GDT recovered to the original values during 1-2 weeks. Increased gap detection thresholds after noise exposure appear connected with elevated hearing thresholds, the deterioration in the performance of some animals in behavioral rasts after strong intensity noise (120 dB SPL) may signal the occurrence of tinnitus in these animals.
Representation of communication sounds in the inferior colliculus of the guinea pig
Šuta, Daniel ; Kvašňák, Eugen ; Popelář, Jiří ; Syka, Josef
The spectrotemporal discharge patterns of the neuronal population were clearly related to the spectrotemporal acoustic patterns of vocalization sounds.This study provides evidence for encoding of the spoctrotemporal acoustic pattern of vocalization sounds in a spcific and distributed way by the firing patterns of a population of IC units.
Functional characteristics of neurons in the auditory thalamus
Kvašňák, Eugen ; Šuta, Daniel ; Popelář, Jiří ; Syka, Josef
The MGB, is similarly as the inferior colliculus (IC) is organized into three subdivisions, with the ventral MGB characterized by the quickest onset reaction with the lowest thresholds to auditory stimulation and with the same ratio of monotonic and non-monotonic RLFs.
NADPH-d - positive neurons in the auditory cortex of young and very old rats
Nwabueze-Ogbo, Fidel Chijoke ; Druga, R. ; Syka, Josef
In young and very old animals stained neurons were localized in layers II-VI and in the subcortical white matter. A significantly higher packing density of labeled supragranular layers. In very old animals the thickness of the auditory cortex and the neuronal density was reduced when compared to the young.
Peripheral and central changes of the auditory system in the elderly
Mazelová, Jana ; Popelář, Jiří ; Valvoda, Jaroslav ; Syka, Josef
We compared the hearing abilities of 15 elderly subjects with a group of 15 young normal hearing. The results of this study support the opinion of many other suthors that the problems of aged people do not result ohly from elevated audiometric thresholds, but also from processes of central oring.
Interaction between descending and ascending pathways in the auditory system
Syka, Josef
Inactivation of the AC resulted in changes in the latency and amplitude of some parts of click-evoked IC responses and in either an increase or decrease in the firing rate of IC neurons in comparison with normal control conditions. The interaction of ascending and descending pathways in the auditory system may contribute to better frequency tuning, suppression of non-relevant acoustical signals and concentration of our attention on specific signals (for example the voice of the speaker.)
Analýza pražské integrované dopravy
Tázlar, Tomáš ; Mervart, Michal (advisor) ; Hejdučková, Iva (referee)
Bakalářská práce je zaměřena na zhodnocení pražské integrované dopravy. V části teoretické je pojednáno o IDS, preferenci vozidel a tarifním systému. Praktická část analyzuje PID, kde je zmiňována historie, vozový park, dopravní prostředky, preference vozidel veřejné dopravy, tarifní systém a analýza autobusové linky č. 148.
Comparison of marketing statistic analysis
Havelka, Milan ; Vrabec, Michal (advisor) ; Průša, Milan (referee)
Práce je zaměřena na výzkum trhu rychlo-obrátkového zboží denní spotřeby. Snaží se porovnat dva přístupy k problematice marketingového výzkumu, z pohledu výzkumu maloobchodníků a výzkumu osob, nebo také výzkumu veřejného mínění. Práce je rozdělena do jednotlivých částí, jak každý obdobný výzkum postupuje. V každém oddíle se snažím přiblížit jednotlivá specifika každého výzkumu, snažím se najít společné a odlišné vlastnosti obou výzkumů. Celá studie spočívá v pochopení přístupu k výzkumu obou firem. Jak výzkum postupuje, kde jsou jeho silné a slabé stránky. Záměrem je nalezení společného obou výzkumů. Při pochopení obou přístupů je možnost vytvoření nové báze výzkumu, který vychází z obou přístupů. Také má vymezit využití obou druhů výzkumů v reálném životě firem.

National Repository of Grey Literature : 246 records found   beginprevious237 - 246  jump to record:
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