op hren ia ▁od or ▁ ▁It ▁has ▁long ▁been ▁claimed ▁that ▁sch iz op hren ia ▁patients ▁exhib it ▁a ▁particular ▁peculiar ▁body ▁od or , ▁and ▁it ▁has ▁been ▁post ulated ▁the ▁od or ▁may ▁be ▁caused ▁by ▁underlying ▁met abol ic ▁ab normal ities ▁associated ▁with ▁the ▁condition , ▁among ▁other ▁factors . ▁Initial ▁studies ▁identified ▁the ▁caus al ▁component ▁as ▁T M HA , ▁however , ▁subsequent ▁studies ▁failed ▁to ▁reproduce ▁such ▁results , ▁with ▁subsequent ▁research ers ▁suggesting ▁the ▁initial ▁research ▁may ▁have ▁had ▁mis ident ified ▁imp ur ities ▁in ▁samples ▁as ▁T M HA ▁due ▁to ▁poor ▁method ology . ▁However , ▁a ▁ 2 0 0 7 ▁study ▁found ▁sch iz op hren ia ▁patients ▁to ▁have ▁reduced ▁ol factory ▁sens itivity ▁to ▁T M HA , ▁possibly ▁indicating ▁sens ory ▁hab itu ation ; ▁the ▁decre ased ▁ability ▁to ▁sm ell ▁the ▁subst ance ▁due ▁to ▁the ▁presence ▁of ▁the ▁subst ance ▁as ▁a ▁constant ▁component ▁of ▁subjects ' ▁own ▁swe at ▁and ▁body ▁od or . ▁Furthermore , ▁the ▁research ers ▁noted ▁a ▁positive ▁association ▁between ▁reduced ▁ability ▁to ▁sm ell ▁T M HA ▁and ▁greater ▁sever ity ▁of ▁dis organ ised ▁and ▁negative ▁sympt oms . ▁ ▁An ▁all usion ▁to ▁T M HA ▁and ▁its ▁pur port ed ▁link ▁to ▁the ▁sm ell ▁of ▁the ▁ment ally ▁ill ▁is ▁made ▁in ▁the ▁ 1 9 9 6 ▁David ▁F oster ▁Wal lace ▁novel , ▁In finite ▁J est , ▁and ▁in