Acoustic Stimulation
Mostrando 25-36 de 39 artigos, teses e dissertações.
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25. Centripetal and centrifugal reorganizations of frequency map of auditory cortex in gerbils
As repetitive acoustic stimulation and auditory conditioning do, electric stimulation of the primary auditory cortex (AI) evokes reorganization of the frequency map of AI, as well as of the subcortical auditory nuclei. The reorganization is caused by shifts in best frequencies (BFs) of neurons either toward (centripetal) or away from (centrifugal) the BF of
The National Academy of Sciences.
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26. The somatosensory intercollicular nucleus of the cat's mesencephalon.
1. Unitary, neural activity was sampled with tungsten electrodes in the mesencephalic, intercollicular region of cats anaesthetized with chloralose. The units' stereotaxic co-ordinates were noted and they were tested for activation by adequate tactile, visual and acoustic stimuli as well as electrical nerve stimulation. The units' geometrical gradations were
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27. Efferent control of cochlear inner hair cell responses in the guinea-pig.
The efferent crossed olivocochlear bundle (c.o.c.b.) was electrically stimulated during intracellular recordings from cochlear inner hair cells in anaesthetized guinea-pigs. The effect of c.o.c.b. stimulation was to decrease the magnitude of the inner hair cell depolarizing component (d.c.) and alternating component (a.c.) receptor potentials evoked by tone
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28. Efferent desensitization of auditory nerve fibre responses in the cochlea of the turtle Pseudemys scripta elegans.
Extracellular recordings were made from single auditory afferents in the isolated half-head of the turtle, and changes in their acoustic sensitivity were examined following electrical stimulation of the efferent fibres to the basilar papilla. Short trains of efferent shocks caused a prolonged elevation of the pure tone thresholds of the auditory afferents an
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29. A look at neural integration in the human auditory system through the stapedius muscle reflex
Ipsilateral and contralateral stapedius muscle contractions were studied as functions of the sound pressure level (SPL) and duration of 2-kHz tone bursts. The study complemented a preceding study in which temporal summation of stapedius muscle contractions produced by pairs of short tone bursts was determined and analyzed. The muscle contractions were de
National Academy of Sciences.
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30. Experience-dependent plasticity in the auditory cortex and the inferior colliculus of bats: Role of the corticofugal system
In the big brown bat, Eptesicus fuscus, the response properties of neurons and the cochleotopic (frequency) maps in the auditory cortex (AC) and inferior colliculus can be changed by auditory conditioning, weak focal electric stimulation of the AC, or repetitive delivery of weak, short tone bursts. The corticofugal system plays an important role in informati
The National Academy of Sciences.
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31. Efferent modulation of hair cell tuning in the cochlea of the turtle.
Intracellular recordings were made from turtle cochlear hair cells in order to study the changes in their tuning properties resulting from electrical stimulation of the efferent axons. Efferent stimulation caused a reduction in the amplitude of the receptor potential at the hair cell's most sensitive or characteristic frequency, an increased amplitude at fre
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32. The location of the cochlear amplifier: Spatial representation of a single tone on the guinea pig basilar membrane
Acoustic stimulation vibrates the cochlear basilar membrane, initiating a wave of displacement that travels toward the apex and reaches a peak over a restricted region according to the stimulus frequency. In this characteristic frequency region, a tone at the characteristic frequency maximally excites the sensory hair cells of the organ of Corti, which trans
The National Academy of Sciences of the USA.
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33. Regulated Expression of Surface AMPA Receptors Reduces Excitotoxicity in Auditory Neurons
Dynamic regulation of the expression of surface AMPA receptors (AMPARs) is a key mechanism to modulate synaptic strength and efficacy in the CNS and also to regulate auditory sensitivity. Here we address the role of surface AMPAR expression in excitotoxicity by blocking clathrin-mediated AMPAR endocytosis in auditory neurons. We used a membrane-permeable, dy
American Physiological Society.
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34. Contact Call-Driven Zenk Protein Induction and Habituation in Telencephalic Auditory Pathways in the Budgerigar (Melopsittacus Undulatus): Implications For Understanding Vocal Learning Processes
Expression of the immediate early gene protein Zenk (zif 268, egr-1, NGF1A, Krox24) was induced in forebrain auditory nuclei in a vocal learning parrot species, the budgerigar (Melopsittacus undulatus), when the subjects either listened to playbacks of an unfamiliar contact call or to a contact call with which they had been familiarized previously. Auditory
Cold Spring Harbor Laboratory Press.
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35. Pleiotropic effects of a disrupted K+ channel gene: Reduced body weight, impaired motor skill and muscle contraction, but no seizures
To investigate the roles of K+ channels in the regulation and fine-tuning of cellular excitability, we generated a mutant mouse carrying a disrupted gene for the fast activating, voltage-gated K+ channel Kv3.1. Kv3.1−/− mice are viable and fertile but have significantly reduced body weights compared with their Kv3.1+/− littermates. Wild-type, heterozyg
The National Academy of Sciences of the USA.
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36. Stimulus-related potassium changes in the organ of Corti of guinea-pig.
1. Potassium concentration was measured with double-barrelled K+-selective microelectrodes within the organ of Corti in the first turn of the guinea-pig cochlea. 2. Penetration of the electrode from scala tympani through the basilar membrane was accompanied by an increase in K+ resting level from 3.0 mmol/l in perilymph to 3.4 mmol/l in cortilymph (n = 8). K