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Biography

Natthawut Arin completed his BS (Psychology: Clinical track), MA (Criminology & Criminal Justice) and PhD (Applied Behavioral Science Research) from University in Thailand. I used to be a clinical psychologist and work as forensic psychologist at Galya Rajanagarindra Institute (Government hospital for forensic psychiatric services), Mental Health Department, Ministry of Public Health for 15 years ago. I have more inspiration to conduct and continue doing the research in forensic psychology issue (e.g. risk assessment, criminal resposibility, malingering). Now, I am a lecture at Psychology Department of Chiang Mai University. And also teach in forensic psychology and criminal psychology subjects.

Abstract

The structure and objectivity to detecting feigned psychopathology being extremely require of forensic setting in Thailand. The Thai version of malingering test (Th-MT) was developed as the first test to reduce the obstacle to language and suitable to Thai context. This initial test was developed based on two broad detection strategies; unlikely and amplified detection strategy (Rogers, 2008). Moreover, the effective sub-detection strategies of the most popular malingering tests including; SIRS, SIMS and M-FAST (Rogers, Bagby, & Dickens, 1992; Smith & Burger, 1997; Miller, 2001) were combined. The 518 samples were collected from nonclinical (undergraduate students, n=421) and clinical samples (psychiatric patients, n=97). The result revealed: 1) In study one, the two detection strategies model supported by confirmatory factor analysis was used to analyze; unlikely detection strategy (two subdetection strategies; Rare Symptoms and Symptom Combinations were loaded), while the three sub-detection strategies of amplified detection strategy were not totally supported (Extreme Psychopathology, Over Negative Self-Image and Suggestibility & Over-report). The combination of Over Negative Self-Image and Suggestibility & Over-report to new strategy called Over-report was reached to goodness-of-fit indices. Furthermore, this Th-MT possesses good internal consistency. 2) Using a simulation designed in study two, one group of simulators asked to feign psychopathology to avoid criminal prosecution of homicide charge (Simulator students, n= 45) were compared with two control groups asked to reply to questions honestly (Honest students, n= 45 and Honest psychiatric patients, n= 45). The results indicate that the mean scores of the Th-MT for simulator students were significantly higher than those of both honest students and honest psychiatric patients. Conclusions, the Th-MT has good psychometric properties of a detecting feigned psychopathology tool and to reliable screen for malingered psychopathology.