Abstract:
:The time it takes a sound to travel from source to ear differs between the ears and creates an interaural delay. It varies systematically with spatial direction and is generally modeled as a pure time delay, independent of frequency. In acoustical recordings, we found that interaural delay varies with frequency at a fine scale. In physiological recordings of midbrain neurons sensitive to interaural delay, we found that preferred delay also varies with sound frequency. Similar observations reported earlier were not incorporated in a functional framework. We find that the frequency dependence of acoustical and physiological interaural delays are matched in key respects. This suggests that binaural neurons are tuned to acoustical features of ecological environments, rather than to fixed interaural delays. Using recordings from the nerve and brainstem we show that this tuning may emerge from neurons detecting coincidences between input fibers that are mistuned in frequency.
journal_name
Elifejournal_title
eLifeauthors
Benichoux V,Fontaine B,Franken TP,Karino S,Joris PX,Brette Rdoi
10.7554/eLife.06072subject
Has Abstractpub_date
2015-04-27 00:00:00issn
2050-084Xjournal_volume
4pub_type
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