Ten schizophrenics who underwent bilateral prefrontal lobotomy are compared with 7 similar nonoperated patients. They show no unique characteristics in Rorschach or Binet tests or in learning or abstract thinking. The lobotomized patients show deficit in capacity for prolonged attention, as in rhyme and number tests requiring deliberation, and in Downey's Perseveration and Motor Inhibition tests. 53-item bibliography. (PsycINFO Database Record (c) 2006 APA, all rights reserved)