Rate versus time representation of high-frequency spectral notches in the peripheral auditory system: A computational modeling study

  • Authors:
  • Enrique A. Lopez-Poveda;Ana Alves-Pinto;Alan R. Palmer;Almudena Eustaquio-Martín

  • Affiliations:
  • Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Avda. Alfonso X "El Sabio" s/n, 37007 Salamanca, Spain and Dto. Informática y Automática, Facultad de Cienci ...;Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Avda. Alfonso X "El Sabio" s/n, 37007 Salamanca, Spain;MRC Institute of Hearing Research, University Park, Nottingham NG7 2RD, UK;Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Avda. Alfonso X "El Sabio" s/n, 37007 Salamanca, Spain

  • Venue:
  • Neurocomputing
  • Year:
  • 2008

Quantified Score

Hi-index 0.01

Visualization

Abstract

A computational model of the peripheral auditory system is used to explain the paradoxical observation that discriminating between broadband noise sounds with and without high-frequency spectral notches is more difficult at mid-intensities than at lower or higher intensities [A. Alves-Pinto, E.A. Lopez-Poveda, Detection of high-frequency spectral notches as a function of level, J. Acoust. Soc. Am. 118 (2005) 2485-2469.]. The simulations suggest that the discrimination task in question relies on comparing the timing of auditory nerve spikes, hence that high-frequency sounds are represented in the auditory nerve by a time code. They further suggest that the improvement in spectral discrimination at high intensities is associated with inherent inner hair cell nonlinearities.