Nirodha-samāpatti, the cessation of perception and feeling, lies beyond the formless attainments and is accessible, the commentaries say, only to non-returners and arahants who have mastered the absorptions. It may last up to seven days. It has been much discussed as a test case for theories of consciousness.
Nirodha-samāpatti
The attainment of cessation: a state in which perception and feeling cease entirely.
Also: cessation of perception and feeling