Birgitte Bechgaard’s research while affiliated with Institute for the Psychological Sciences and other places

Speech samples were collected on 20 Danish schizophrenic adoptees, along with 26 control adoptees and their respective biological and adoptive relatives. Typewritten transcripts of these speech samples were scored using the Gottschalk-Gleser Social Alienation-Personal Disorganization (SA-PD), or "Schizophrenic', content analysis scale. Both mean scale scores and the proportion of subjects with extremely high (i.e. deviant) scores were significantly higher in schizophrenic adoptees than in either (a) subjects with no psychiatric disorder or (b) the sample with psychiatric disorders other than schizophrenia. The proportion of deviant scores was also notably high among subjects who, though not schizophrenic, had schizotypal features on the SADS-L interview. Scores were particularly high in schizophrenic adoptees who had a biological parent or sibling with schizophrenia or schizotypal features. By contrast, scores of 29 adoptive relatives of the schizophrenic probands were quite low. The present study appears to corroborate the results of previous studies done in the U.S.A. and Great Britain which suggest that high scores on the SA-PD scale tend to characterize those schizophrenics for whom genetic liability appears to be strongest.