Echo-imaging exploits an environmental high-pass filter to access spatial information with a non-spatial sensor. Baier et al.

We provide three datasets. Dataset 1 is from a formal psychophysical experiment where we measured echo-acoustic sensitivity functions for detecting different wave patterns in six bats. For Dataset 2 we measured the acoustic impulse responses of the stimuli used in the psychophysical experiment. In dataset 1, each file contains a variable “result” which contains recorded data from all trials that one bat did at one particular spatial frequency (e.g. 9 cyc/m). The data are arranged in a 5x181 array, where each column (except the very first) contains data from one trial. The rows store the following parameters: time code, wave amplitude (+- mm, i.e. /2 mm), side of reference stimulus (1=left, 2=right), side that bat chose, latency. From each file, the psychometric function of this bat at this spatial frequency can be obtained. For four bats, no full psychometric functions at 4 cyc/m could be recorded. Instead, the files (named e.g psychphys_data_bat2_disc_comp_4_16vs9_16.mat) contain 30 trials each of the stimulus with a spatial frequency of 4 cyc/m at maximum wave amplitude (+-16 mm = 32 mm) and the stimulus with a spatial frequency of 9 cyc/m at maximum wave amplitude (+-16 mm = 32 mm), that were presented alternately within a session. For dataset 2, we recorded impulse responses (IR) at four different ensonification angles: 30°, 45°, 60°, and 90°. The filename contains spatial frequency and wave amplitude (in =- mm) of the ripple disk as well as the ensonification angle (e.g. 18_04_ripple_plate_IR_90.mat means the ripple disk with 18 cyc/m, +-4 mm (= 8mm) was ensonified from directly above). “0_0” and “0_1” refer to the flat reference and control disks, respectively. Each file contains several variables: FS (sampling rate in Hz), cfn (ensonification stimulus: white noise filtered with the speaker’s compensatory impulse response), ir (impulse response, cut from xc), irlags (respective lags, cut from lags), lags (the lags at which the correlations are computed), rec (recorded signal), xc (result of the cross-correlation of rec and cfs). For dataset 3, we processed echoes from wave patterns (IR convolved with typical echolocation call) according to a physiologically plausible model of the auditory periphery (Wiegrebe 2008 Biol Cybern). The filename contains spatial frequency and wave amplitude (in =- mm) of the ripple disk. The two variables in the file are the NAP itself and the sampling rate FS.

本研究提供三套数据集。数据集1源自一项规范的心理物理实验（psychophysical experiment），实验中我们针对6只蝙蝠开展检测不同波形模式的回声声学灵敏度函数（echo-acoustic sensitivity functions）测量。数据集2对应本研究心理物理实验中所用刺激的声学冲激响应（impulse response, IR）测量结果。
在数据集1中，每个文件均包含一个名为"result"的变量，该变量存储了单只蝙蝠在某一特定空间频率（spatial frequency，例如9 cyc/m）下完成所有试次（trial）的记录数据。数据以5×181的数组形式排布，除首列外，其余每一列均对应一次试次的记录数据。各行分别存储以下参数：时间编码、波形振幅（±mm，即峰峰值为2 mm）、参考刺激侧（1=左侧，2=右侧）、蝙蝠选择的一侧、反应潜伏期。从每个文件中，均可提取得到该蝙蝠在对应空间频率下的心理测量函数（psychometric function）。
针对其中4只蝙蝠，未能记录到其在4 cyc/m下的完整心理测量函数。此类文件（例如命名格式为psychphys_data_bat2_disc_comp_4_16vs9_16.mat的文件）中，各存储了同一场实验中交替呈现的两类刺激的30组试次数据：一类为空间频率4 cyc/m、最大波形振幅（±16 mm，对应峰峰值32 mm）的刺激，另一类为空间频率9 cyc/m、最大波形振幅（±16 mm，对应峰峰值32 mm）的刺激。
针对数据集2，我们在4种不同的声照射角度（ensonification angle）下记录了冲激响应：30°、45°、60°与90°。文件名包含波纹圆盘（ripple disk）的空间频率、波形振幅（单位：±mm）以及声照射角度信息。例如文件18_04_ripple_plate_IR_90.mat，即代表以正上方为声照射角度、空间频率18 cyc/m、波形振幅±4 mm（对应峰峰值8 mm）的波纹圆盘数据。"0_0"与"0_1"分别对应平面参考圆盘与对照圆盘。每个文件均包含多个变量：FS（采样率，单位：Hz）、cfn（声照射刺激：经扬声器补偿冲激响应滤波后的白噪声）、ir（从xc中截取的冲激响应）、irlags（从lags中截取的对应延迟序列）、lags（用于计算相关性的延迟序列）、rec（记录信号）、xc（rec与cfn的互相关（cross-correlation）结果）。
针对数据集3，我们依据一个符合生理学合理性的听觉外周模型（auditory periphery model，Wiegrebe 2008, Biol Cybern），对源自波形模式的回声（即冲激响应与典型回声定位叫声（echolocation call）做卷积得到的信号）进行了处理。文件名包含波纹圆盘的空间频率与波形振幅（单位：±mm）。文件内仅包含两个变量：NAP本身与采样率FS。