TY - JOUR
T1 - Improving the clinical utility of the SIRS cognitive items
T2 - Preliminary reliability, validity, and normative data in pretrial and clinical samples
AU - Wynkoop, Timothy F.
AU - Frederick, Richard I.
AU - Hoy, Michelle
PY - 2006/10
Y1 - 2006/10
N2 - The utility of the Structured Interview of Reported Symptoms [SIRS; Rogers, R., Bagby, R. M., & Dickens, S. E. (1992). Structured Interview of Reported Symptoms professional manual. Odessa, FL: Psychological Assessment Resources], Improbable Failure Rate (IF) scale in pretrial (N = 64) and clinical (N = 153) samples was explored. Internal consistencies of the IF items were α = .81 and α = .92, respectively, with split-half reliabilities of .89 and .84, respectively. The IF scale loaded distinctly from the SIRS primary (psychosis) scales in principal components analysis, and the pattern of performances among clinical groups were as expected (e.g., normal controls outperformed patients with focal lesions and dementia, CHI patients outperformed dementia patients). Performance on the IF items was correlated with MMSE score (r = -.59, p ≤ .001), age (r = .53, p ≤ .001), and education (r = .31, p ≤ .001), but not with Barona estimated FSIQ (r = -.14, p = .08). For normals and psychiatric patients there was a clear falling off of IF error scores after 1 error, and for CHI patients the fall off began after 2 errors. Results lend credence to the SIRS IF scale as an acceptable screening measure for feigned cognitive abilities.
AB - The utility of the Structured Interview of Reported Symptoms [SIRS; Rogers, R., Bagby, R. M., & Dickens, S. E. (1992). Structured Interview of Reported Symptoms professional manual. Odessa, FL: Psychological Assessment Resources], Improbable Failure Rate (IF) scale in pretrial (N = 64) and clinical (N = 153) samples was explored. Internal consistencies of the IF items were α = .81 and α = .92, respectively, with split-half reliabilities of .89 and .84, respectively. The IF scale loaded distinctly from the SIRS primary (psychosis) scales in principal components analysis, and the pattern of performances among clinical groups were as expected (e.g., normal controls outperformed patients with focal lesions and dementia, CHI patients outperformed dementia patients). Performance on the IF items was correlated with MMSE score (r = -.59, p ≤ .001), age (r = .53, p ≤ .001), and education (r = .31, p ≤ .001), but not with Barona estimated FSIQ (r = -.14, p = .08). For normals and psychiatric patients there was a clear falling off of IF error scores after 1 error, and for CHI patients the fall off began after 2 errors. Results lend credence to the SIRS IF scale as an acceptable screening measure for feigned cognitive abilities.
KW - Cognition
KW - Cognitive deficit
KW - Malingering
KW - SIRS
UR - http://www.scopus.com/inward/record.url?scp=33750977302&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33750977302&partnerID=8YFLogxK
U2 - 10.1016/j.acn.2006.06.009
DO - 10.1016/j.acn.2006.06.009
M3 - Article
C2 - 16982172
AN - SCOPUS:33750977302
SN - 0887-6177
VL - 21
SP - 651
EP - 656
JO - Archives of Clinical Neuropsychology
JF - Archives of Clinical Neuropsychology
IS - 7
ER -