Buddha Abhidhamma - Ultimate Science - BuddhaNet

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5 Saëàyatana-paccayà Phasso
Saëàyatana conditions the arising of phassa or, in other words,
phassa arises as a consequence of saëàyatana.
Saëàyatana means the six ajjhattikàyàtanas (six internal bases)
as above.
Phassa here indicates the phassa cetasika present in the 32
lokiya-vipàka cittas.
To describe the individual co-relations, cakkhàyatana conditions
the arising of cakkhusamphassa (i.e., phassa associated with
cakkhu-vi¤¤àõa); sotàyatana conditions the arising of sotàsamphassa;
ghànàyatana conditions the arising of ghànasamphassa; jivhàyatana
conditions the arising of jivhàsamphassa; kàyàyatana conditions the
arising of kàyasamphassa; manàyatana conditions the arising of
manosamphassa. Samphassa is synonymous with phassa.
Cakkhàyatana (eye-base) is cakkhu-pasàda, the eye-door, where
the visual object strikes to give rise to seeing consciousness
(cakkhu-vi¤¤àõa). Then the phassa associated with the seeing
conscious is said to be conditioned by the eye-base. The remaining
five phassas are produced similarly.
Without the five physical bases or sense-organs, there can
be no sense impressions; and without the sixth base, or
consciousness, there can be no mental impression.
6 Phassa-paccayà Vedanà
Phassa conditions the arising of vedanà or, in other words, vedanà
arises as a consequence of phassa.
Here phassa is the phassa-cetasika associated with the 32
lokiya-vipàka cittas. Vedanà is also the vedanà cetasika present in
the 32 lokiya-vipàka cittas.