There are 7 known artists under the name Vivisection:
1 - Japanese death/grind band formed in 1991, released several splits with notorious bands like Nasum and C.S.S.O.
2 - Germany grind/noisecore band formed July 1991, later changed their name to Hartsoeker in 1994
3 - German grindcore band formed during the mid 90s
4 - German brutal death metal band, released one album in 2000.
5 - US melodic death/deathcore band.
6 - Swedish melodic death metal band, disbanded in 2010.
7 - US Death/Thrash Metal band