Descriptions of schizotypic psychopathology have a long history in the clinical psychopathology literature. Kraepelin and Eugen Bleuler made note of what they termed latent schizophrenia, a form of personality aberration thought to be, in essence, a quantitatively less severe expression of schizophrenia. P. E. Meehl described what he believed to be the four fundamental signs and symptoms of schizotypy: cognitive slippage, interpersonal aversiveness, anhedonia, and ambivalence. According to Meehl's model, schizotypy, as a personality organization reflective of a latent liability for schizophrenia, can manifest itself behaviorally and psychologically in various degrees of clinical compensation. Finally, Meehl conjectures that the base rate of schizotaxia in the general population is approximately 10%. Meehl's base rate estimate is found on a dominant-gene formulation, which posits that every schizophrenic person must have a parent of schizotype namely, a parent carrying the schizophrenia producing genotype.