Abstract
Anatomical and physiological auditory data and pitch measurements are presented including some additional analysis. The data provide the basis for a new computer model of sustained chopper neurons in the ventral cochlear nucleus. New and old evidence indicating a preference for multiples of 0.4 ms in oscillations of chopper neurons in the cochlear nucleus of different species such as man, cats, and Guinea fowls, is summarized. Our hypothesis is that the time constant of 0.4 ms is due to the minimum synaptic delay of chopper neuron connections. Anatomical findings show that chopper neurons are indeed connected and can excite each other; a model of a circular network of neurons that are connected via synapses with a delay of 0.4 ms is thus plausible. Results concerning frequency tuning and dynamical properties of periodicity encoding of chopper neurons are reviewed. It is concluded that chopper neurons receive input both from auditory nerve fibres and onset neurons.
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Abbreviations
- CN:
-
Cochlear nucleus
- VCN:
-
Ventral cochlear nucleus
- AVCN:
-
Anterior ventral cochlear nucleus
- PVCN:
-
Posterior ventral cochlear nucleus
- DCN:
-
Dorsal cochlear nucleus
- IC:
-
Inferior colliculus
- CF:
-
Characteristic frequency
- CV:
-
Coefficient of variation
- SPL:
-
Sound pressure level
- PSTH:
-
Poststimulus time histogram
- AM:
-
Amplitude modulated signal
- SAM:
-
Sinusoidal amplitude modulated sine wave
- EPSP:
-
Excitatory postsynaptic potentials
References
Adams JC (1983) Multipolar cells in the ventral cochlear nucleus project to the dorsal cochlear nucleus and the inferior colliculus. Neurosci Lett 37:205–208
Arnesen AR, Osen KK (1978) The cochlear nerve in the cat: topography, cochleotopy and fiber spectrum. J Comp Neurol 178:661–678
Banks MI, Sachs M (1991) Regularity analysis in a compartment model of chopper units in the anteroventral cochlear nucleus. J Neurophysiol 65:606–629
Blackburn C, Sachs M (1989) Classification of unit types in the anteroventral cochlear nucleus: PST histograms and regularity analysis. J Neurophysiol 62:1303–1329
Bourk TR (1976) Electrical responses of neuronal units in the anteroventral cochlear nucleus of the cat. PhD thesis, MIT
Caspary DM, Backoff PM, Finlayson PG, Palombi PS (1994) Inhibitory inputs modulate discharge rate within frequency receptive fields of anteroventral cochlear nucleus neurons. J Neurophysiol 72:2124–2133
Ferragamo M, Golding N, Oertel D (1998) Synaptic inputs to stellate cells in the ventral cochlear nucleus. J Neurophysiol 79:51–63
Frisina RD, Smith RL, Chamberlain SC (1985) Differential encoding of rapid changes in sound amplitude by second order auditory neurons. Exp Brain Res 60:417–422
Frisina RD, Smith RL, Chamberlain SC (1990a) Encoding of amplitude modulation in the gerbil cochlear nucleus: I. A hierarchy of enhancement. Hear Res 44:99–122
Frisina RD, Smith RL, Chamberlain SC (1990b) Encoding of amplitude modulation in the gerbil cochlear nucleus: II. Possible neural mechanisms. Hear Res 44:123–142
Glass L (2001) Synchronization and rhythmic processes in physiology. Nature 410:277–284
Hackett JT, Jackson H, Rubel EW (1982) Synaptic excitation of the second and third order auditory neurons in the avian brain stem. Neuroscience 7:1455–1469
Hewitt MJ, Meddis R, Shakleton TM (1992) A computer model of a cochlear-nucleus stellate cell: responses to amplitude-modulated and pure-tone stimuli. J Acoust Soc Am 91:2096–2109
Langner G (1981) Neuronal mechanisms for pitch analysis in the time domain. Exp Brain Res 44:450–454
Langner G (1983) Evidence for neuronal periodicity detection in the auditory system of the guinea fowl: implications for pitch analysis in the time domain. Exp Brain Res 52:333–355
Langner G (1992) Periodicity coding in the auditory system. Hear Res 60:115–142
Langner G, Schreiner C (1988) Periodicity coding in the inferior colliculus of the cat: I. Neuronal mechanisms. J Neurophysiol 60:1799–1822
Li RYS, Guinan JJ (1971) Antidromic and orthodromic stimulation of neurons receiving calyces of held. MIT Q Rpt 100:227–234
Oertel D, Wu SH, Garb MW, Dizack C (1990) Morphology and physiology of cells in slice preparations of the posteroventral cochlear nucleus of mice. J Comp Neurol 295:136–154
Osen KK (1969) Cytoarchitecture of the cochlear nuclei in the cat. J Comp Neurol 136:453–484
Ostapoff EM, Feng JJ, Morest DK (1994) A physiological and structural study of neuron types in the cochlear nucleus. II. Neuron types and their structural correlation with response properties. J Comp Neurol 346:19–42
Palmer A, Jiang D, Marshall DH (1996) Responses of ventral cochlear nucleus onset and chopper units as a function of signal bandwidth. J Neurophysiol 75:780–794
Pfeiffer RR (1966) Classification of response patterns of spike discharges for units in the cochlear nucleus: tone-burst stimulation. Exp Brain Res 1:220–235
Rees A, Langner G (2005) The inferior colliculus. Temporal coding in the auditory midbrain, Springer, Berlin Heidelberg New York pp 346–376
Rhode WS, Smith PH (1986) Encoding timing and intensity in the ventral cochlear nucleus of the cat. J Neurophysiol 56:261–286
Schouten JF (1970) The residue revisited. In: Plomp R, Smoorenburg GF (eds) Frequency analysis and periodicity detection in hearing, Sijthoff AW, Leiden, pp 41–53
Singer W (1998) Consciousness and the structure of neuronal representations. Philos Trans R Soc Lond B Biol Sci 353:1829–1840
Taschenberger H, Gersdorff H (2000) Fine tuning an auditory synapse for speed and fidelity: developmental changes in presynaptic waveform, EPSC kinetics, and synaptic plasticity. J Neurosci 20:9162–9173
Wiegrebe L, Meddis R (2004) The representation of periodic sounds in simulated sustained chopper units of the ventral cochlear nucleus. J Acoust Soc Am 115:1207–1218
Wiegrebe L, Winter IM (2001) Temporal representation of iterated rippled noise as a function of delay and sound level in the ventral cochlear nucleus. J Neurophysiol 85:1206–1219
Winter IM, Robertson D, Yates GK (1990) Diversity of characteristic frequency rate–intensity functions in guinea pig auditory nerve fibres. Hear Res 45:191–202
Winter IM, Wiegrebe L, Patterson RD (2001) The temporal representation of the delay of iterated rippled noise in the ventral cochlear nucleus of the guinea-pig. J Physiol 537:553–566
Young ED, Robert JM, Shofner WP (1988) Regularity and latency of units in ventral cochlear nucleus: implications for unit classification and generation of response properties. J Neurophysiol 60:1–29
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Bahmer, A., Langner, G. Oscillating neurons in the cochlear nucleus: I. Experimental basis of a simulation paradigm. Biol Cybern 95, 371–379 (2006). https://doi.org/10.1007/s00422-006-0092-6
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DOI: https://doi.org/10.1007/s00422-006-0092-6