Why do we feel only 0.18 kg of brain when it actually is 1.5kg?

Question

It can't possibly be coz of the cerebrospinal fluid providing buoyancy(as is given in most books) coz weight lost by body is gained by liquid & this liquid is within us itself.

Answer 1

Neck musculature (10 muscle groups in the neck and shoulders) is the major reason for us not feeling the pain. When we get severe neck pain, we do feel the head to be very heavy due to the weakening of the tendons in the muscles.