title: Neural development of binaural tuning through Hebbian learning predicts frequency-dependent best delays.
abstract: Birds use microsecond differences in the arrival times of the sounds at the two ears to infer the location of a sound source in the horizontal plane. These interaural time differences (ITDs) are encoded by binaural neurons which fire more when the ITD matches their "best delay." In the textbook model of sound localization, the best delays of binaural neurons reflect the differences in axonal delays of their monaural inputs, but recent observations have cast doubts on this classical view because best delays were found to depend on preferred frequency. Here, we show that these observations are in fact consistent with the notion that best delays are created by differences in axonal delays, provided ITD tuning is created during development through spike-timing-dependent plasticity: basilar membrane filtering results in correlations between inputs to binaural neurons, which impact the selection of synapses during development, leading to the observed distribution of best delays.
authors.affiliation: Laboratoire Psychologie de la Perception, CNRS and Université Paris Descartes, 75006 Paris, France.
authors.forename: Bertrand
authors.initials: B
authors.lastname: Fontaine
authors.forename: Romain
authors.initials: R
authors.lastname: Brette
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods; D000200:Action Potentials / Q000502:physiology*; D000818:Animals; D001306:Auditory Pathways / Q000502:physiology; D005544:Forecasting; D007858:Learning / Q000502:physiology*; D055495:Neurogenesis / Q000502:physiology*; D009474:Neurons / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology*; D013017:Sound Localization / Q000502:physiology*; D020305:Strigiformes; D013997:Time Factors