Artificial beep used for research purposes in the behavioral experiment (link to the paper: <a href="http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3384222/" rel="nofollow">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3384222/</a>). The sound was generated in Matlab using binary click trains at the fundamental frequency of 330 Hz and 100 ms duration, which were bandpass filtered with a bandwidth equal to 1/50th of the formant frequency using Malcolm Slaney's Auditory Toolbox. Formant center frequency was 6.912 kHz. The formant frequency was chosen to lie within rat and human sensitivity range.<br/>人為的嗶嗶聲<br/>聲道：1<br/>類型：wav<br/>research、artificial、beep<br/>研究、人造、嘟<br/>資料來源：freesound ( https://freesound.org )