'mental things, mental factors', are those mental concomitants which are bound up with the simultaneously arising consciousness (citta = viññāna) and conditioned by its presence.

Whereas in the Suttas all phenomena of existence are summed up under the aspect of 5 groups:

• materiality,

• feeling,

• perception,

• mental constructions,

• consciousness (s. khandha),

the Abhidhamma as a rule treats them under the more philosophical 3 aspects:

• consciousness,

• mental factors and

• materiality (citta, cetasika, rūpa).

Thus, of these 3 aspects, the mental factors (cetasika) comprise feeling, perception and the 50 mental constructions, altogether 52 mental concomitants.

Of these, 25 are lofty qualities (either karmically advantageous or neutral), 14 karmically disadvantageous, while 13 are as such karmically neutral, their karmical quality depending on whether they are associated with advantageous, disadvantageous or neutral consciousness. For details s. Tab. II, III. Cf. prec. (App.)