阿茲海默症
https://www.youtube.com/watch?v=yJXTXN4xrI8
https://www.youtube.com/watch?v=oT5pDvdMzhk
The 40-Hz auditory stimuli consisted of 1-kHz pure tones with a duration of 1 ms at a frequency of 40-Hz (i.e., one sound in every 25 ms) at an intensity of 60 dB.