New answers tagged sensation
Mine is the evolutionarily ancient tooth-damage avoidance-response 2003 speculation article, but if I have it right, then toothed animals in general should experience it, not just primates. Maybe it goes all the way down the entire chain to octopi, snails, clams, any organism which needs to avoid radular-destruction when carefully trying to eat algae from ...
The difference is in whether the animal has voluntary control over the touch. If the animal touches another object by moving its body to initiate the touch, then the it is active touch. If the animal is touched without control over the movement (for example, a human experimenter grazing the whiskers with a finger), then the touch is passive.
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