TY - JOUR
T1 - Temporally patterned sound pulse trains affect intensity and frequency sensitivity of inferior collicular neurons of the big brown bat, Eptesicus fuscus
AU - Jen, Philip H.S.
AU - Zhou, Xiaoming
AU - Wu, Chung
N1 - Funding Information:
Acknowledgements We thank Dr. J Carrel and two anonymous reviewers for their critical comments on an earlier version of this manuscript. This work was supported by a research grant from the National Science Foundation (NSF IBN 9907610) and a grant from the Research Council of the University of Missouri (URC 01-012 Jen). All procedures were conducted in compliance with NIH publication No. 85-23, ``Principles of Laboratory Animal Care'' and with the approval of the Institutional Animal Care and Use Committee (no. 1438) of the University of Missouri-Columbia.
PY - 2001
Y1 - 2001
N2 - This study examined the effect of temporally patterned pulse trains on intensity and frequency sensitivity of inferior collicular neurons of the big brown bat, Eptesicus fuscus. Intensity sensitivity of inferior collicular neurons was expressed by the dynamic range and slope of rate-intensity functions. Inferior collicular neurons with non-monotonic rate-intensity functions have smaller dynamic ranges and larger slopes than neurons with monotonic or saturated rate-intensity functions. Intensity sensitivity of all inferior collicular neurons improved by increasing the number of non-monotonic rate-intensity functions when the pulse repetition rate of pulse trains increased from 10 to 30 pulses per second. Intensity sensitivity of 43% inferior collicular neurons further improved when the pulse repetition rate of pulse trains increased still from 30 to 90 pulses per second. Frequency sensitivity of inferior collicular neurons was expressed by the Q10, Q20, and Q30 values of threshold frequency tuning curves and bandwidths of isointensity frequency tuning curves. Threshold frequency tuning curves of all inferior collicular neurons were V-shape and mirror-images of their counterpart isointensity frequency tuning curves. The Q10, Q20, and Q30 values of threshold frequency tuning curves of all inferior collicular neurons progressively increased and bandwidths of isointensity frequency tuning curves decreased with increasing pulse repetition rate in temporally patterned pulse trains. Biological relevance of these findings to bat echolocation is discussed.
AB - This study examined the effect of temporally patterned pulse trains on intensity and frequency sensitivity of inferior collicular neurons of the big brown bat, Eptesicus fuscus. Intensity sensitivity of inferior collicular neurons was expressed by the dynamic range and slope of rate-intensity functions. Inferior collicular neurons with non-monotonic rate-intensity functions have smaller dynamic ranges and larger slopes than neurons with monotonic or saturated rate-intensity functions. Intensity sensitivity of all inferior collicular neurons improved by increasing the number of non-monotonic rate-intensity functions when the pulse repetition rate of pulse trains increased from 10 to 30 pulses per second. Intensity sensitivity of 43% inferior collicular neurons further improved when the pulse repetition rate of pulse trains increased still from 30 to 90 pulses per second. Frequency sensitivity of inferior collicular neurons was expressed by the Q10, Q20, and Q30 values of threshold frequency tuning curves and bandwidths of isointensity frequency tuning curves. Threshold frequency tuning curves of all inferior collicular neurons were V-shape and mirror-images of their counterpart isointensity frequency tuning curves. The Q10, Q20, and Q30 values of threshold frequency tuning curves of all inferior collicular neurons progressively increased and bandwidths of isointensity frequency tuning curves decreased with increasing pulse repetition rate in temporally patterned pulse trains. Biological relevance of these findings to bat echolocation is discussed.
KW - Bat
KW - Frequency tuning curve
KW - Inferior colliculus
KW - Pulse train
KW - Rate-intensity function
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U2 - 10.1007/s003590100233
DO - 10.1007/s003590100233
M3 - Article
C2 - 11763959
AN - SCOPUS:0035209239
SN - 0340-7594
VL - 187
SP - 605
EP - 616
JO - Journal of Comparative Physiology - A Sensory, Neural, and Behavioral Physiology
JF - Journal of Comparative Physiology - A Sensory, Neural, and Behavioral Physiology
IS - 8
ER -