Detection of malingered mental retardation.
In a cross-validation of results from L. O. Graue et al. (2007), standard psychological assessment instruments, as well as tests of neurocognitive and psychiatric feigning, were administered under standard instructions to 24 participants diagnosed with mild mental retardation (MR) and 10 demographically matched community volunteers (CVH). A 2nd group of 25 community volunteers was instructed to malinger MR (CVM) during testing. CVM participants obtained Wechsler Adult Intelligence Scale (3rd ed.; D. Wechsler, 1997) Full Scale Intelligence Quotient scores that were significantly lower than the demographically similar CVH group but comparable to the MR group, suggesting that CVM subjects feigned cognitive impairment. On the basis of standard cutting scores from test manuals or published articles, of the 11 feigning measures administered, only the Test of Memory Malingering (TOMM; T. N. Tombaugh, 1996) retention trial had a specificity rate >.90 in the MR group. However, the 2nd learning trial of the TOMM, as well as a short form of the Digit Memory Test (T. J. Guilmette, K. J. Hart, A. J. Guiliano, & B. E. Leininger, 1994), approached this level of specificity, with both at .88. These results raise concerns about the specificity rates at recommended cutting scores of commonly used feigning tests in defendants with MR.
Department of Psychology, University of Kentucky, Lexington, KY, USA.
Anne L
AL
Shandera
David T R
DT
Berry
Jessica A
JA
Clark
Lindsey J
LJ
Schipper
Lili O
LO
Graue
Jordan P
JP
Harp
D000328:Adult; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000523:psychology*; D007361:Intelligence Tests / Q000706:statistics & numerical data*; D008297:Male; D008306:Malingering / Q000175:diagnosis*; D011939:Mental Recall; D008875:Middle Aged; D009483:Neuropsychological Tests / Q000706:statistics & numerical data*; D011594:Psychometrics / Q000706:statistics & numerical data; D012016:Reference Values; D015203:Reproducibility of Results; D014888:Wechsler Scales / Q000706:statistics & numerical data*; D055815:Young Adult