普氏蹄蝠声呐脉冲序列与结构形变的模式匹配

Pattern matching between bisonar pulse sequence and structural deformation of Pratt’s roundleaf bats

普氏蹄蝠的声呐系统具有显著的动态特性,包括声呐结构的动态形变(鼻叶运动、耳廓运动)和超声脉冲序列的动态调整(脉冲数目、激发时刻等)。为了研究这两种动态特性之间是否存在耦合关系,通过生物实验同步采集普氏蹄蝠的鼻叶运动、耳廓运动和声呐脉冲序列;针对出现频率较高的两种鼻叶/耳廓耦合运动模式,利用神经脉冲模式分类方法(Spike train SIMilarity Space,SSIMS),对其同步的声呐脉冲序列进行分类。分析结果表明,普氏蹄蝠声呐脉冲序列的变化与其声呐系统结构的动态形变相匹配,即不同鼻叶/耳廓耦合运动模式对应不同脉冲数目和脉冲激发时刻的声呐脉冲序列。

The biosonar system of Pratt’s roundleaf bats is characterized by the peripheral dynamics including variable structural deformation caused by noseleaf and pinna motions as well as the dynamic adjustment of ultrasonic pulse sequence caused by variations of pulse number and emitting time.To investigate whether there is a relationship between the two sources of variability,the noseleaf and pinna motions with the records of biosonar pulses are synchronously collected in biological experiments.Two frequently occurred noseleaf/pinna motion patterns are chosen for analyses.A novel spike-train similarity space(SSIMS)method for analyzing neural spike sequences are used to classify the biosonar pulse sequences emitted exactly during the corresponding noseleaf/pinna motions.The results show that the variabilities in biosonar pulse sequence match the peripheral dynamics,i.e.,different noseleaf/pinna motion patterns correspond to the biosonar pulse sequences with different pulse numbers and emitting times.