'mental indulging'. There are mentioned 18 ways of indulging: 6 in gladness (somanassūpavicāra), 6 in sorrow (domanassa), 6 in indifference (upekkhā).
"Perceiving with the eye a visible form ... hearing with the ear a sound ... being in mind conscious of an object, one indulges in the joy-producing object, the sorrow-producing object, the indifference-producing object... " (M. 137; A. III, 61). -
In the Com. to A., upavicāra is said to be identical with vitakka-vicāra (q.v.).