Buddha Abhidhamma - Ultimate Science - BuddhaNet

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Then bhavaïga cittas sink into life-continuum and the
person arises from phala-samàpatti.
4. When one of the three characteristics of existence enters
the avenue of the mind-door of an arahant, the lifecontinuum
vibrates twice as bhavaïga-calàna and
bhavaïgupaccheda and becomes arrested. The manodvàràvajjana
considers the object and decides whether
it is good or bad. Then one of the four ¤àõa-sampayuttaü
mahà-kusala cittas, observing the tãlakkhaõa object,
functions three times as parikamma (omit in tikkha-pa¤¤à
person), upacàra and anuloma, and, observing Nibbàna,
functions once as vodàna. After that arahatta-phala citta,
observing Nibbàna, functions as appanà-javana many
times as long as the person wishes up to seven days.
Then bhavaïga cittas sink into life-continuum and the
person arises from phala-samàpatti.
Nirodha-samàpatti Vãthi
‘Nirodha-samàpatti’ means ‘attainment of extinction’. This vãthi
is developed to suspend temporarily all consciousness and
mental activity, following immediately upon the semi-conscious
state called ‘sphere of neither-perception-nor-non-perception’
(nevasa¤¤à-n’àsa¤¤à-yatana jhàna).
Only anàgàmi or arahant who has mastered all the nine
absorption (jhànas) is able to develop the nirodha-samàpatti vãthi.
The procedure for developing the nirodha-samàpatti vãthi is as
follows.
First of all the person enters the råpàvacara first-jhàna, comes
out of it and meditates on the jhàna components as to their
characteristics of impermanence, suffering and non-self. He