THE FUNCTIONAL ARCHITECTURE OF THE COGNITIVE NUMERICAL-PROCESSING SYSTEM - EVIDENCE FROM A PATIENT WITH MULTIPLE IMPAIRMENTS

RH, a brain-damaged patient with multiple impairments in numerical pro cessing, was tested extensively on a set of transcoding tasks in which numerals were converted from one form to another (e.g. 94 --> ninety- four). The pattern of error rates across tasks, and the patterns of er ror types within tasks, support the assumption that numerical processi ng is mediated by multiple independent numeral comprehension and numer al production processes that communicate via central semantic represen tations of numbers (McCloskey, Caramazza, & Basili, 1985).