After the sampaticchana-citta has arisen and fallen away, the process of
cittas experiencing an object is not yet over. The sampaticchana-citta is
succeeded by another ahetuka vipākacitta which is still the result of kamma.
This type of citta is called investigating-consciousness, santīrana-citta.
Santīrana-citta investigates or considers the object which was experienced
by one of the dvi-pañca viññānas (''the five pairs''), and which was ''received''
by the sampaticchana-citta. Santīrana-citta succeeds sampaticchana-citta in a
process of cittas experiencing an object through one of the five sense-doors;
sampaticchana-citta is a condition for the arising of santīrana-citta. When
seeing has arisen, sampaticchana-citta succeeds the seeing-consciousness,
and santīrana-citta succeeds the sampaticchana-citta in the process of cittas
which experience visible object. It is the same with the santīrana-citta which
arises in the process of cittas experiencing an object through one of the other
sense-doors; tt succeeds the sampaticchana-citta. We cannot choose whether
santīrana-citta should arise or not; cittas arise because of conditions, they are
Santīrana-citta is also an ahetuka vipākacitta. When the object is unpleasant, the santīrana-citta is akusala vipāka and it is accompanied by upekkhā (indifferent feeling). As regards santīrana-citta which is kusala vipāka, there are two kinds. When the object is pleasant but not extraordinarily pleasant, santīrana-citta is accompanied by upekkhā. When the object is extraordinarily pleasant, the santīrana-citta is accompanied by somanassa, pleasant feeling. Thus, there are three kinds of santīrana- citta in all. It depends on conditions which kind of santīrana-citta arises.