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	Morphology and distribution of nadph-diaphorase-positive neurons in the auditory cortex of the rat Nwabueze-Ogbo, Fidel Chijoke ; Druga, R. ; Syka, Josef Our results indicate the preferred localization of the NADPH-d/NOS positive neurons in the infragranular layers, which are sources of the majority of corticofugal neurons projecting to the subcortical structures. Detailed record
	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. Detailed record
	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. Detailed record
	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. Detailed record
	Morphology and distribution of nadph-diaphorase positive neurons in the auditory cortex of the rat Nwabueze-Ogbo, Fidel Chijoke ; Druga, R. ; Syka, Josef Our results indicate the preferred lacalization of the NADPH-d/ NOS positive neurons in the infragranular layers, which are sources of the majority of corticofugal neurons projecting to the subcortical structures. Detailed record

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