Buddha Abhidhamma - Ultimate Science - BuddhaNet

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1 When the object of infinite space (àkàsa) appears at the
mind-door, the bhavaïga-stream vibrates twice and
becomes arrested (Na-Da). The mind-door consciousness,
i.e. mano-dvàràvajjana, observes the object and
decides whether it is good or bad. Then one of the two
upekkhà-sahagataü ¤àõa-sampayuttaü mahà-kusala cittas
functions as parikamma (Pa), upacàra (U), anuloma (Nu)
and gotrabhu (Go) in a person of slow wisdom (mandapa¤¤à),
or as upacàra, anuloma and gotrabhu in a person
of quick wisdom (tikkha-pa¤¤à). Then àkàsàna¤càyatanakusala
citta arises once as appanà-javana and bhavaïga
cittas sink into life-continuum.
2 In going up the ladder to the second aråpàvacara jhàna,
the meditator meditates on the àkàsàna¤càyatana-kusala
citta. When the degree of concentration is high enough,
the second aråpàvacara-appanà vãthi will ensue.
The object that appears at the mind-door is
àkàsàna¤càyatana-kusala citta which causes the cognitive
series of bhavaïga-calàna, bhavaïgu-paccheda, manodvàràvajjana,
parikamma (omit in tikkha-pa¤¤à person),
upacàra, anuloma, gotrabhu and vi¤¤àna¤càyatana kusala
citta as appanà-javana to arise. Life-continuum then flows
on as usual.
3 In the case of the third aråpàvacara jhàna, the object that
appears at the mind-door is nothingness which results
from the omission of àkàsàna¤càyatana-kusala citta. The
cognitive series of consciousness arise as before terminating
with àkinca¤¤àyatana kusala citta as appanà-javana.
4 In going up to the fourth aråpàvacara jhàna, the meditator
concentrates on the àkinca¤¤àyatana kusala citta as the