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A Possible Neural Mechanism Explaining How the Big Brown bat Recognizes its Own Echoes

A Possible Neural Mechanism Explaining How the Big Brown Bat...

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“基因、进化与生理功能多样性”海内外学术研讨会暨中国生理学会第七届比较生理学学术会议

作者：吴忠信 Philip H.S.Jen 台湾师范大学生命科学系 Division of Biological Sciences and Interdisciplinary Neuroscience Program University of Missouri-ColumbiaMissouriUSA

Insectivorous bats such as the big brown bat,Eptesicus fuscus,progressively shorten duration,lower frequency,decrease amplitude and increase repetition rate of emitted pulses as they search for,approach,and finally intercept insects or negotiate obstacles. Presumably,this variation in pulse parameters allows bats to obtain as much information as possible about the localized target from analysis of the returning ***, this dynamic variation of multiple parameters of emitted pulses predicts that analysis of an echo parameter by bats would be inevitably affected by other co-varying echo parameters. Auditory neurons that discharge maximally to a particular duration have been shown in many animals including *** sound duration to which these neurons are tuned corresponds closely to the behaviorally relevant sounds in these animal ***,these duration -tuned neurons not only play an important role for bat echolocation but also for sound recognition particularly in human speech and animal *** main objective of our studies is to determine how echo auditory selectivity may be affected by changing echo duration during different phases of hunting. Specifically,we studied variation in echo frequency and amplitude selectivity of durationtuned IC neurons using three pulse-echo pairs with pulse duration and pulse-echo gap comparable to those occurring during three phases of *** report here that durationtuned IC neurons have the greatest echo frequency and amplitude selectivity when determined with BD *** data suggest that duration-tuned collicular neurons not only can facilitate bat's echo recognition but also can enhance echo frequency and amplitude selectivity for prey feature analysis throughout a target approaching sequence during hunting. These data also support previous behavior studies showing that bats prepare their auditory system to analyze expected returning echoes within a time window to extract target features

关键词： the echolocation bat Duration tuned neurons Inferior colliculus Amplitude selectivity Frequency selectivity Pulse-echo pairs Expected or unexpected

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