To the Editor: Russell and colleagues have made an important contribution to the literature on intellectual functioning in patients with schizophrenia. However, their claim that intellectual decline is "a myth" overstates the case. The first problem is one that the authors partially acknowledge, namely, the biased nature of their study and, hence, the lack of generalizability. Their own data from a representative population-based cohort R5415511CHDDBHCI show that the premorbid IQ deficit in children who later develop schizophrenia is one-third of a standard deviation (i.e., around 5 IQ points). Equivalent figures from a later U.K. national cohort suggest that the deficit may be around one-half of a standard deviation (i.e., 8 IQ points) R5415511CHDDGFEJ, as do the data from the Swedish conscript cohort R5415511CHDDBAIA. The mean childhood IQ of their current group was 84.1, that is, just over one standard deviation below the mean. Hence, it is not representative of preschizophrenic children.