Buddha Abhidhamma - Ultimate Science - BuddhaNet

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Phassa and vedanà arise simultaneously in the same
consciousness. Nevertheless phassa is regarded as the cause, and
vedanà as the effect. In accordance with the six types of phassa
that have been enumerated in the previous causal relation, there
are six types of vedanà.
Because of cakkhusamphassa, cakkhusamphassajà-vedanà arises.
Because of sotàsamphassa, sotasamphassajà-vedanà arises. Because
of ghànasamphassa, ghànasamphassajà-vedanà arises. On account
of jivhà samphassa, jivhasamphassaja-vedanà arises. On account of
kàyasamphassa, kàyasamphassajà-vedanà arises. On account of
manosamphassa, manosamphassajà-vedanà arises.
Cakkhusamphassajà-vedanà means the vedanà (feeling) in the
eye-consciousness produced by cakkhusamphassa which is the
sense-impression or sense-contact in the eye-consciousness. The
remaining vedanàs should be similarly understood.
7 Vedanà-paccayà Taõhà
Vedanà conditions taõhà to arise or taõhà arises as a consequence
of vedanà.
Vedanà here means the six vedanàs enumerated above as
cakkhusamphassajà-vedanà, sotasamphassajà-vedanà, and so on. In
the causal relations explaining how each individual is going
round and round in the wheel of existence the cause produces
the effect, and the effect becomes the cause to produce its effect
again. Some authors, however, like to take all the vedanàs
associated with the 81 lokiya cittas as paccaya, since vedanà is
playing the role of the cause here.
Now the taõhà (craving) which arises as the result of vedanà
(feeling) is also of six types – viz., råpa-taõhà (craving for visual
object), sadda-taõhà (craving for sound), gandha-taõhà (craving