Artificial beep used for research purposes in the behavioral experiment (link to the paper: http://www. Ncbi. Nlm. Nih. Gov/pmc/articles/pmc3384222/). 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.
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