Processing of behaviorally relevant temporal parameters of acoustic stimuli by single neurons in the superior olivary nucleus of the leopard frog |
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Authors: | Curtis J Condon Su-Hua Chang Albert S Feng |
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Institution: | (1) Neuroscience Program, University of Illinois at Urbana-Champaign, 61801 Urbana, IL, USA;(2) Department of Physiology and Biophysics, University of Illinois at Urbana-Champaign, 61801 Urbana, IL, USA;(3) NPA Group, Beckman Institute, University of Illinois, 405 N. Mathews Ave., 61801 Urbana, IL, USA |
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Abstract: | Summary Response characteristics of 130 single neurons in the superior olivary nucleus of the northern leopard frog (Rana pipiens pipiens) were examined to determine their selectivity to various behaviorally relevant temporal parameters rise-fall time, duration, and amplitude modulation (AM) rate of acoustic signals. Response functions were constructed with respect to each of these variables. Neurons with different temporal firing patterns such as tonic, phasic or phasic-burst firing patterns, participated in time domain analysis in specific manners. Phasic neurons manifested preferences for signals with short rise-fall times, thus possessing low-pass response functions with respect to this stimulus parameter; conversely, tonic and phasic-burst units were non-selective and possessed all-pass response functions. A distinction between temporal firing patterns was also observed for duration coding. Whereas phasic units showed no change in the mean spike count with a change in stimulus duration (i.e., all-pass duration response functions), tonic and phasic-burst units gave higher mean spike counts with an increase in stimulus duration (i.e., primary-like high-pass response functions). Phasic units manifested greater response selectivity for AM rate than did tonic or phasic-burst units, and many phasic units were tuned to a narrow range of modulation rates (i.e., band-pass). The results suggest that SON neurons play an important role in the processing of complex acoustic patterns; they perform extensive computations on AM rate as well as other temporal parameters of complex sounds. Moreover, the response selectivities for rise-fall time, duration, and AM rate could often be shown to contribute to the differential responses to complex synthetic and natural sounds.Abbreviations
SON
superior olivary nucleus
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DMN
dorsal medullary nucleus
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TS
torus semicircularis
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FTC
frequency threshold curve
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BF
best excitatory frequency
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PAM
pulsatile amplitude modulation
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SAM
sinusoidal amplitude modulation
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SQAM
square-wave amplitude modulation
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MTF
modulation transfer function
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PSTH
peri-stimulus time histogram |
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Keywords: | Temporal firing pattern Rise-fall time Duration Amplitude modulation Modulation transfer function Temporal processing |
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