The representation of the spectra and fundamental frequencies of steady‐state single‐ and double‐vowel sounds in the temporal discharge patterns of guinea pig cochlear‐nerve fibers

1990 ◽  
Vol 88 (3) ◽  
pp. 1412-1426 ◽  
Author(s):  
A. R. Palmer
Keyword(s):  
Steady State ◽  
Guinea Pig ◽  
Nerve Fibers ◽  
Cochlear Nerve ◽  
Fundamental Frequencies ◽  
Discharge Patterns

The representations of the steady-state vowel sound /e/ in the discharge patterns of cat anteroventral cochlear nucleus neurons

1990 ◽  
Vol 63 (5) ◽  
pp. 1191-1212 ◽  
Author(s):  
C. C. Blackburn ◽  
M. B. Sachs
Keyword(s):  
Steady State ◽  
Cochlear Nucleus ◽  
Nerve Fibers ◽  
Stimulus Level ◽  
Complex Stimulus ◽  
Vowel Sound ◽  
Stimulus Representation ◽  
Anteroventral Cochlear Nucleus ◽  
Discharge Patterns ◽  
Bushy Cells

1. We have recorded the responses of neurons in the anteroventral cochlear nucleus (AVCN) of barbiturate-anesthetized cats to the synthetic, steady-state-vowel sound /e/, presented over a range of stimulus intensities. 2. The responses of (putative) spherical bushy cells [primary-like (Pri) units] to the vowel resemble those of auditory-nerve fibers (ANFs) in terms of both rate and temporal encoding at low and moderate stimulus levels. It was not possible to study the responses of most Pri units at the highest stimulus level because of the large neurophonic component present in recordings from most primarylike units at higher stimulus levels. 3. The responses of many (putative) globular bushy cells [primarylike with notch (PN) units] to the vowel resemble those of ANFs; however, there appears to be greater heterogeneity in the responses of units in the PN population than in the Pri population in terms of both temporal and rate encoding. 4. Populations of stellate cells (chopper units) have degraded representations of the temporal information in ANF population discharge patterns in response to the vowel; this is consistent with the responses of these units to pure tones. Both regular (ChS) and irregular (ChT) chopper subpopulations, however, maintain better rate-place representations of the vowel spectrum than does the population of ANFs as a whole. The rate-place representations of the vowel spectrum by both chopper populations closely resemble those of low and medium spontaneous rate ANFs at most stimulus levels. 5. The data presented in this paper suggest that a functional partition of the AVCN chopper population could yield two distinct rate representations in response to a complex stimulus: one that is graded with stimulus level (over a 30 to 40 dB range) and that, even at rate saturation, maintains a "low contrast" stimulus representation; and a second that maintains a robust, "high contrast" stimulus representation at all levels but that confers less information about stimulus level.

Afferent discharges from venous pressoreceptors in liver

1977 ◽  
Vol 232 (1) ◽  
pp. 76-81 ◽  
Author(s):  
A. Nijima
Keyword(s):  
Guinea Pig ◽  
Portal Vein ◽  
Discharge Rate ◽  
Venous Pressure ◽  
Nerve Fibers ◽  
Liver Preparation ◽  
Rate Discharge ◽  
Afferent Discharge ◽  
Discharge Patterns

Afterent discharges were observed in dissected filaments or single nerve fibers of hepatic nerve in the guinea pig and the rabbit. Increasing the perfusion pressure of the portal vein in isolated liver preparation in the guinea pig caused an increase in afferent discharge rate. Discharge patterns were compatible with those of the slowly adapting type. Increasing the portal venous pressure by means of intravenous injection of Locke's solution into the left jugular vein in the rabbit in vivo caused an increase in afferent discharge rate. Increasing the hepatic arterial pressure was without effect. It is suggested that pressoreceptors are present in or near the venous wall of the portal venous system and that they send information about blood pressure in the portal vein to the central nervous system.

The response of the cochlear nerve fibers to ultrasonic sounds in rats

1985 ◽  
Vol 1 ◽  
pp. S2
Author(s):  
Zheng Chang-Mu ◽  
Susumu Ito ◽  
Junsei Horikawa ◽  
Keiichi Murata
Keyword(s):  
Nerve Fibers ◽  
Cochlear Nerve
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