clitoris is most sensitive part of human being, containing lot of nerve endings. You do not need any experiment or evidence to show the proof. If you stimule any nerve, excessively, it will get numb or even damaged. Numbness can be self self limiting if the damage is not extensive.
I don't feel what I've felt some time ago,so i decide I need something more powerful and i but from Edenfantasys a new vibrator , more powerfull, and its good :)
You are lucky that you have got a stronger vibratpr and you are happy with it. Do not be surprised if you need another vibrator after some time. clitoris get sensation from 2 source, one is direct rubbing and other is through vaginal muscles. clitoris is connected vaginal muscles from its bottom.If you search more you will find this information. Mildly rubbing around clitoris can revive the sensitivity in time.Another possible technique is anal peripheral prostate massage. this is one of the 4 prostate massage. This massage stimulates genital area and groin. This massage is for woman also for this purpose.
Look up reynaud's syndrome.