Regarding the tactile drive: there was recently some research in the news regarding neurons in the skin that react to stroking movement with a specific speed of

Regarding the tactile drive: there was recently some research in the news regarding neurons in the skin that react to stroking movement with a specific speed of about 3 cm per second, which are common to many mammals. Related Wikipedia article: https://en.wikipedia.org/wiki/C_tactile_afferent https://en.wikipedia.org/wiki/C_tactile_afferent