Using the Inventory of Problems-29 (IOP-29) with the Inventory of Problems Memory (IOP-M) in malingering-related assessments : a study with a Slovenian sample of experimental feigners

Šömen, Maja Maša (author), Lesjak, Staša (author), Majaron, Teja (author), Lavopa, Luca (author), Giromini, Luciano (author), Viglione, Donald (author), Podlesek, Anja (author)

A recently published article harshly criticized forensic practitioners operating in Slovenia for not including in their assessments any tests specifically designed to assess negative distortion (Areh, 2020). To promote better forensic assessment practice and stimulate future research on symptom and performance validity assessment in Slovenia, the current study translated the Inventory of Problems-29 (IOP-29; Viglione & Giromini, 2020) and its recently developed memory module (IOP-M; Giromini et al., 2020) into Slovene language and tested their validity and effectiveness by conducting a simulation/analogue study. Among 150 volunteers, 50 completed the IOP-29 and IOP-M under standard instructions; 50 were asked to respond as if they suffered from depression; and 50 were asked to respond pretending to suffer from schizophrenia. Statistical analyses showed that (1) the IOP-29 discriminated well between simulators and honest test-takers (▫$d \ge$▫ 3.56), demonstrating the same effectiveness when inspecting feigned depression (sensitivity = 88%) and feigned schizophrenia (sensitivity = 88%) at an almost perfect specificity (98%); (2) the IOP-M identified 50% of simulators of depression and 80% of simulators of schizophrenia at perfect specificity (100%); and (3) combining the results of the IOP-29 with those of the IOP-M notably improved classification accuracy so as to demonstrate incremental validity. Taken together, these findings provide initial support for using the IOP-29 and IOP-M in applied settings in Slovenia. Limitations related to the design of the study and recommendations for further research are provided.

• Language: English
• Keywords: psychological assessment, malingering, symptom validity tests, performance validity tests, Inventory of problems - 29 IOP - 29, Inventory of problems memory IOP - M, symptom validity tests, inventory of problems
• Typology: 1.01 - Original Scientific Article
• Organization: FF - Faculty of Arts
• Publication date: 01.01.2021
• Year: 2021
• Number of pages: Str. 104-113
• Numbering: Vol. 14, iss. 2
• PID: 20.500.12556/RUL-136904
• UDC: 159.9.072
• ISSN on article: 1938-971X
• DOI: 10.1007/s12207-021-09412-2
• COBISS.SI-ID: 65582339
• Publication date in RUL: 24.05.2022

Record is a part of a journal

• Title: Psychological injury and law
• Shortened title: Psychol. inj. law
• Publisher: Springer
• ISSN: 1938-971X
• COBISS.SI-ID: 518448409

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 14.05.2021

Secondary language

• Language: Slovenian
• Keywords: psihološko ocenjevanje, simuliranje, testi veljavnosti simptomov, testi veljavnosti dosežkov