Kamma does not only produce the dvi-pañca-viññānas (the five pairs) and
sampaticchana-citta, it also produces santirana-citta (investigating-
consciousness) which succeeds sampaticchana-citta. Santīrana-citta performs
in the sense-door process the function of santīrana (investigating the
object) ; it is ahetuka vipākacitta.
As we have seen (Ch. 9), there are three kinds of santīrana-citta which can
perform the function of investigating:
1. Santīrana-citta which is akusala vipāka, accompanied
2. Santīrana-citta which is kusala vipāka, accompanied
3. Santīrana-citta which is kusala vipāka, accompanied
by somanassa (in case the object is extraordinarily
Santīrana-citta is succeeded by votthapana-citta (determining-
consciousness). Votthapana is another function of citta; the votthapana-
citta determines the object in the sense-door process. After it has
determined the object it is succeeded by kusala cittas or by akusala cittas.
The conditions through which it arises are different from the conditions for
santīrana-citta which is produced by kamma. Votthapana-citta is not vipāka
and it is not kusala or akusala but it is an ahetuka kiriyācitta. As we have
seen, the votthapana-citta is actually the mano-dvārāvajjana-citta which
performs the function of votthapana in the sense-door process and is then
called votthapana-citta. The mano-dvārāvajjana-citta performs two
function in the mind-door process it performs the function of adverting to
an object through the mind-door, and in the sense-door process it
performs the function of votthapana.