London, Hayling, and Brixton tests) designed to assess specific executive processes
(planning, inhibition, and abstraction of logical rules) that were also sensitive to frontal
dysfunction. The performance of elderly participants (n= 48) was significantly poorer than
that of young participants (n= 47) in all 3 tasks. Processing speed, measured by means of a
color-naming task, explained some but not all of the age-related differences. These results …