The validation of the Russian version of the ‘Continuous Performance Test - Identical Pairs’ method implemented on the ‘Inqusit’ software platform



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Abstract

Attention selectivity impairment is an important cognitive symptom of schizophrenia, but there is a lack of Russian language adapted methods for objective and accurate assessment of these impairments. The aim of the study: translation into Russian, adaptation and validation of the Inquisit Continuous Performance Test - Identical Pairs (CPT-IP), implemented on the ‘Inquisit’ software platform.

Materials and Methods. Sixty-seven people were examined in 2025, of whom 34 formed the ‘Mentally Healthy’ sample (15 men and 19 women, mean age 22.5 [20.0; 43.3]  years) and 33 formed the ‘Schizophrenia Patients’ sample (13 men and 20 women, mean age 37.2 [25.2; 48.5] years). The authors translated the original CPT-IP English-language script, which was further validated by the authors of the methodology and posted in the Iquisit library. For each subject from the two samples, the Russian-language CPT-IP script, the classical methods ‘Corrective Test’, ‘Finding Numbers’ and ‘Memorising 10 Words’, as well as the CPT-IP retest were administered.

Results. Cronbach's alpha for both samples was 0.73, which characterises sufficient internal consistency of the method. A statistically significant negative correlation was found between the DPrime in the CPT-IP and the number of errors in the ‘Corrective test’ in both samples, which confirms the convergent validity of the CPT-IP for assessing attention selectivity function. Discriminant validity is demonstrated by the absence of significant correlations between CPT-IP scores and the results of the ‘Memorizing 10 words’ test in both samples. Test-retest stability reaches ‘notable’ and ‘high’ levels on the Cheddock scale.

Conclusion. The CPT-IP method adapted into a Russian language has sufficient internal consistency, convergent and discriminant validity, and test-retest stability to recommend its use in studies of cognitive impairment in schizophrenia patients.

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About the authors

Ilya Fedotov

Ryazan State Medical University

Author for correspondence.
Email: ilyafdtv@yandex.ru
ORCID iD: 0000-0002-2791-7180

MD, PhD, Associate Professor of Psychiatry and Psychology Counselling Department

Russian Federation

Dmitriy I. Shustov

Ryazan State Medical University

Email: dmitri_shustov@mail.ru
ORCID iD: 0000-0001-7803-3388
SPIN-code: 3887-5475

MD, Dr. Sci. (Medicine), Professor

Russian Federation, Ryazan

Anna G. Faustova

Ryazan State Medical University

Email: lakoniya@yandex.ru
ORCID iD: 0000-0001-8264-3592
SPIN-code: 5869-7409

Chair of the Department of Clinical Psychology

Russian Federation, Ryazan

Victoria Ershova

RSMU

Email: a.faustova@rzgmu.ru
ORCID iD: 0009-0003-9481-7643

Студент

Russian Federation

Anastasia Lapatina

РязГМУ

Email: a.faustova@rzgmu.ru
ORCID iD: 0009-0009-0059-7568

Студент

Russian Federation

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