The author writes: "Recent pyschological studies of commissurotomy patients have provoked considerable, sometimes wild, speculation by both philosophers and the experimenters themselves. Among neuropsychologists, the prevalent view is that the split-brain patient has two minds. These two minds are taken to exemplify a variety of dichotomies: for example, one is atomistic, analytical, digital, symbolic, discursive; the other, holistic, synthetic, analogic, perceptual, eidetic. Further, it is inferred, there is a similar split in the fundamental cogntive styles of the left and right halves of the intact brain, whether or not they are also counted as separate minds. . . . In this monograph, my primary concern is the number of minds split-brain patients have; the speculations on what types of minds these may be . . .are left for another time. I advocate a conservative assessment of split-brain research: the split-brain patient has one mind and is one person, although he has on occasion a disunified consciousness."