scholarly journals Microsecond Precision of Phase Delay in the Auditory System of the Barn Owl

2005 ◽  
Vol 94 (2) ◽  
pp. 1655-1658 ◽  
Author(s):  
Hermann Wagner ◽  
Sandra Brill ◽  
Richard Kempter ◽  
Catherine E. Carr
Keyword(s):  
Auditory System ◽  
Group Delay ◽  
Interaural Time Difference ◽  
Strong Dependence ◽  
Basic Mechanism ◽  
Sound Level ◽  
Phase Delay ◽  
Nucleus Laminaris ◽  
Neuronal Coding ◽  
Millisecond Accuracy

The auditory system encodes time with sub-millisecond accuracy. To shed new light on the basic mechanism underlying this precise temporal neuronal coding, we analyzed the neurophonic potential, a characteristic multiunit response, in the barn owl's nucleus laminaris. We report here that the relative time measure of phase delay is robust against changes in sound level, with a precision sharper than 20 μs. Absolute measures of delay, such as group delay or signal-front delay, had much greater temporal jitter, for example due to their strong dependence on sound level. Our findings support the hypothesis that phase delay underlies the sub-millisecond precision of the representation of interaural time difference needed for sound localization.

scholarly journals Specific loss of neural sensitivity to interaural time difference of unmodulated noise stimuli following noise-induced hearing loss

2020 ◽  
Vol 124 (4) ◽  
pp. 1165-1182
Author(s):  
Hariprakash Haragopal ◽  
Ryan Dorkoski ◽  
Austin R. Pollard ◽  
Gareth A. Whaley ◽  
Timothy R. Wohl ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Interaural Time Difference ◽  
Acoustic Trauma ◽  
Sound Level ◽  
Broadband Noise ◽  
Neural Responses ◽  
Auditory Midbrain ◽  
Midbrain Neurons ◽  
Perceptual Abilities ◽  
Encode Time

Sensorineural hearing loss compromises perceptual abilities that arise from hearing with two ears, yet its effects on binaural aspects of neural responses are largely unknown. We found that, following severe hearing loss because of acoustic trauma, auditory midbrain neurons specifically lost the ability to encode time differences between the arrival of a broadband noise stimulus to the two ears, whereas the encoding of sound level differences between the two ears remained uncompromised.

scholarly journals RORF - A Radio Optical Reference Frame

1995 ◽  
Vol 166 ◽  
pp. 381-381
Author(s):  
N. Zacharias ◽  
A.L. Fey ◽  
J.L. Russell ◽  
K.J. Johnston
Keyword(s):  
Reference Frame ◽  
Group Delay ◽  
Phase Delay ◽  
Dual Frequency ◽  
Radio Observations ◽  
Optical Reference ◽  
Vlbi Data

The radio observations are based on more than one million pairs of group delay and phase delay rate observations from all applicable dual frequency Mark–III VLBI data from 1979 until the end of 1993.

scholarly journals Variability Reduction in Interaural Time Difference Tuning in the Barn Owl

2008 ◽  
Vol 100 (2) ◽  
pp. 708-715 ◽  
Author(s):  
Brian J. Fischer ◽  
Masakazu Konishi
Keyword(s):  
Anterior Part ◽  
Interaural Time Difference ◽  
Barn Owl ◽  
Time Difference ◽  
Central Nucleus ◽  
Nucleus Laminaris ◽  
Cochlear Nuclei ◽  
Reduction Property ◽  
Single Burst ◽  
Barn Owls

The interaural time difference (ITD) is the primary auditory cue used by the barn owl for localization in the horizontal direction. ITD is initially computed by circuits consisting of axonal delay lines from one of the cochlear nuclei and coincidence detector neurons in the nucleus laminaris (NL). NL projects directly to the anterior part of the dorsal lateral lemniscal nucleus (LLDa), and this area projects to the core of the central nucleus of the inferior colliculus (ICcc) in the midbrain. To show the selectivity of an NL neuron for ITD requires averaging of responses over several stimulus presentations for each ITD. In contrast, ICcc neurons detect their preferred ITD in a single burst of stimulus. We recorded extracellularly the responses of LLDa neurons to ITD in anesthetized barn owls and show that this ability is already present in LLDa, raising the possibility that ICcc inherits its noise reduction property from LLDa.

scholarly journals Asymmetric Excitatory Synaptic Dynamics Underlie Interaural Time Difference Processing in the Auditory System

PLoS Biology ◽  
2010 ◽  
Vol 8 (6) ◽  
pp. e1000406 ◽  
Author(s):  
Pablo E. Jercog ◽  
Gytis Svirskis ◽  
Vibhakar C. Kotak ◽  
Dan H. Sanes ◽  
John Rinzel
Keyword(s):  
Auditory System ◽  
Interaural Time Difference ◽  
Time Difference ◽  
Synaptic Dynamics

scholarly journals Adjustment of Interaural-Time-Difference Analysis to Sound Level

2010 ◽  
pp. 325-336
Author(s):  
Ida Siveke ◽  
Christian Leibold ◽  
Katharina Kaiser ◽  
Benedikt Grothe ◽  
Lutz Wiegrebe
Keyword(s):  
Interaural Time Difference ◽  
Sound Level ◽  
Time Difference ◽  
Difference Analysis

The Analysis and Correction of Time-Delay in the Precise Acoustic Measurement System

2013 ◽  
Vol 333-335 ◽  
pp. 236-242
Author(s):  
Zhi Gang Huang ◽  
Chun Jie Qiao ◽  
Chao Ma ◽  
Shen Zhao
Keyword(s):  
Time Delay ◽  
Phase Difference ◽  
Measurement System ◽  
Group Delay ◽  
Phase Delay ◽  
Signal Frequency ◽  
Acoustic Measurement ◽  
Signal Phase ◽  
Acoustic Transducer ◽  
Good Consistency

The acoustic transducer is a nonlinear system, which will cause a time delay to signals. The system group and phase delay have a large influence on the results in the transmit-time measurement. In order to solve the problem, this paper proposes to use the signal phase difference to eliminate the phase delay, and precisely determine the group delay by the method of experiment. At first, this paper theoretically proves that the group delay of the acoustic measurement system is constant, and the phase delay changes over signal frequency, then it analyzes the influence of group and phase delay on the measuring results and meanwhile puts forward a method to use the multi-frequency signal phase difference to eliminate group delay .Finally, it achieves the group delay through experiments, and there is a good consistency between the experimental results and theoretical analysis.

Sign in / Sign up

Export Citation Format

Share Document