The role of interaural time difference and fundamental frequency difference in the identification of concurrent vowel pairs

1992 ◽  
Vol 91 (6) ◽  
pp. 3579-3581 ◽  
Author(s):  
Trevor M. Shackleton ◽  
Ray Meddis
Keyword(s):  
Fundamental Frequency ◽  
Interaural Time Difference ◽  
Time Difference ◽  
Frequency Difference

Estimated Cochlear Delays in Low Best-Frequency Neurons in the Barn Owl Cannot Explain Coding of Interaural Time Difference

2010 ◽  
Vol 104 (4) ◽  
pp. 1946-1954 ◽  
Author(s):  
Martin Singheiser ◽  
Brian J. Fischer ◽  
Hermann Wagner
Keyword(s):  
Interaural Time Difference ◽  
Low Frequency ◽  
Barn Owl ◽  
Time Difference ◽  
Central Nucleus ◽  
Response Functions ◽  
Frequency Range ◽  
Response Peak ◽  
Cochlear Delays

The functional role of the low-frequency range (<3 kHz) in barn owl hearing is not well understood. Here, it was tested whether cochlear delays could explain the representation of interaural time difference (ITD) in this frequency range. Recordings were obtained from neurons in the core of the central nucleus of the inferior colliculus. The response of these neurons varied with the ITD of the stimulus. The response peak shared by all neurons in a dorsoventral penetration was called the array-specific ITD and served as criterion for the representation of a given ITD in a neuron. Array-specific ITDs were widely distributed. Isolevel frequency response functions obtained with binaural, contralateral, and ispilateral stimulation exhibited a clear response peak and the accompanying frequency was called the best frequency. The data were tested with respect to predictions of a model, the stereausis model, assuming cochlear delays as source for the best ITD of a neuron. According to this model, different cochlear delays determined by mismatches between the ipsilateral and contralateral best frequencies are the source for the ITD in a binaural neuron. The mismatch should depend on the best frequency and the best ITD. The predictions of the stereausis model were not fulfilled in the low best-frequency neurons analyzed here. It is concluded that cochlear delays are not responsible for the representation of best ITD in the barn owl.

Synaptic plasticity determines the character of interaural-time-difference representation

2003 ◽  
Vol 52-54 ◽  
pp. 321-326 ◽  
Author(s):  
Christian Leibold ◽  
J.Leo van Hemmen
Keyword(s):  
Synaptic Plasticity ◽  
Interaural Time Difference ◽  
Time Difference
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