lady sayadev, saygi u ba khin goenka lineage vipassan In the above-titled lineage of vipassana, it is said that as soon as there is contact through the sensory bases, sensations are produced on the body.

Why and how does this happen?

And, what are the type of sensations arising on physical body -- for example, tingling, etc., etc.?
Not sure how Goenka tradition explains it, but Contact(Passa) means the union of form,sense &amp; sense consciousness. That always causes feeling(Vedana) to arise according to Paticca-samuppada(dependant arising).