Description: The JCTI is a computerized nonverbal intelligence test designed with figurative items which don’t require acquired knowledge. The JCTI has been developped so that the number of items (up to 52) is individually adapted according to the test-taker’s performance. Thanks to the nonverbal nature of its items, this test is suitable for testing persons without cultural bias. It yields with a Reasoning Index (RIX), an age-referenced standard score that uses a mean of 100, and 15 points per standard deviation.

Along with excellent Alpha reliability coefficients over ages (ranged from .92 to .96 in persons aged 7:5 years to 62 years; the value for the entire sample gathering 1,020 persons was .95), the JCTI RIX has also demonstrated high validity. As a result of factor analysis for construct validity, the JCTI showed to be very highly loaded on the general ability factor (.88) that latently linked it to the subscales of the Scholastic Assessment Test-Recentered (SAT-I) and proved to be the most loaded in inductive reasoning (.96).

Analyses also demonstrated that the correlations with other measures of cognitive ability were within the expectations and higher magnitudes of Pearson’s coefficient were observed with nonverbal tasks. As an example, the JCTI RIX and the Performance IQ of the Wechsler Adult Intelligence Scale (WAIS) were correlated at .74 (N=50). Furthermore, the JCTI RIX was seen to be very closely related to the mathematical scale of the SAT-I at .82 (N=99). Significant correlations were also observed with general (r=.67 with WAIS FSIQ, N=50) and crystallized intelligence measures (r=.57 with the JCCES CEI, N=66). According to these findings the JCTI RIX can be regarded as a valid and reliable measure that could be used in the field of education and psychology.

Nota bene: We are constantly collecting data in order to perform further psychometric analyses on criterion related validity. Consequently, we are looking for poeple who already took the reasoning tests of the SAT, the ACT and other tests such as the WAIS IQ scale. Thank you very much for your help!

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