So if it's saying in base of infinite space, one does not perceive sensory impingement at the 5 sense doors, then it means one1.15.3 – paṭigha-sañña: perceptions from the 5 sense doors
“Paṭighasaññānaṃ atthaṅgamā”ti tattha katamā paṭighasaññā? Rūpasaññā saddasaññā … pe … phoṭṭhabbasaññā—imā vuccanti “paṭighasaññāyo”. Imā paṭighasaññāyo santā honti samitā vūpasantā atthaṅgatā abbhatthaṅgatā appitā byappitā sositā visositā byantīkatā. Tena vuccati “paṭighasaññānaṃ atthaṅgamā”ti.
“Terminating perceptions of (sense) impingement” means: Therein what are perceptions of (sense) impingement? Visible (object) perception, audible (object) perception, Intermediate sense perceptions. tangible (object) perception. These are called perceptions of (sense) impingement. These perceptions of (sense) impingement are calmed, tranquillized, inhibited, terminated, vanished, destroyed, well destroyed, withered, well withered, abrogated. Therefore this is called “terminating perceptions of (sense) impingement”.
does or can perceive sensory impingement at the 5 sense doors prior to that, in the 4 jhānas.
Looking through the 4 jhāna Vb 12 carefully, I see it redefines kāya as body of mind, and defines sukha as mental pleasure instead of physical, but it doesn't actually say anywhere the 5 senses are disconnected. So even though Ab is trying to redefine 4 jhānas as a purely mental experience, it doesn't actually say it's not possible to hear sounds, feel mosquito bites, etc., from the 4 jhānas.
Also, with Vb 12 I see nothing about appanā samādhi, upacara, no mentally frozen states one has to emerge from. Vitakka, vicāra, are all verbal thoughts.
Can you guys confirm this understanding is correct?
The kind of all mental 4 jhānas Vb12 is talking about, is more like there are 3 people talking to me at once, I don't pay attention to 2 of them and only hear what one of them is saying. A mosquito just bit me, but my attention is on the 1 person is saying, so I didn't perceive the mosquito bite at the body contact sense door, not that I CAN'T perceive sound and mosquito bites.
But this is different than the four jhānas of Vism., that says I'm in a state where I'm not capable of hearing sounds or feeling mosquito bites because the mind is disconnected from the 5 senses completely.