“…Another effective procedure for estimating premorbid ability relies upon cognitive instruments which measure an over learned skill such as reading or assess patterns of performance ( Nelson and McKenna, 1975 ; Del Ser et al, 1997 ; Russell et al, 2000 ; Contador et al, 2015 ). Several authors have criticized the use of performance tests, such as the vocabulary subtest from the WAIS-R, to estimate the premorbid IQ; because vocabulary is known to decline with aging and is sensitive to brain damage, specifically in the neuroanatomical basis of language ( Martin and Fedio, 1983 ; Del Ser et al, 1997 ; Sierra et al, 2010 ; Hebben et al, 2011 ; de Oliveira et al, 2014 ). However, reading ability becomes, with practice, an automatic ability that is highly resistant to cognitive impairment ( Del Ser et al, 1997 ; Russell et al, 2000 ; Khandaker et al, 2011 ; Harman-Smith et al, 2013 ; Hessler et al, 2013 ).…”