Pukaew Kirtiputra. Validity study of the comprehensive test of nonverbal intelligence (CTONI). Master's Degree(Clinical Psychology ). Mahidol University. : Mahidol University, 2007.
Validity study of the comprehensive test of nonverbal intelligence (CTONI)
การศึกษาความตรงของแบบทดสอบ comprehensive test of nonverbal intelligence (CTONI)
Abstract:
The primary objective of this research was to study the validity of the
Comprehensive Test of Nonverbal Intelligence (CTONI) by correlating it to the
Wechsler Abbreviated Scale of Intelligence Thai Version (WASI-T). CTONI is a
nonverbal intelligence test, but some research suggests that CTONI composite scores
may assess both verbal and nonverbal abilities. Therefore, WASI-T, which has
adequate specificity between the two abilities, was chosen to validate the CTONI, to
find whether CTONI has the ability to differentiate between verbal and nonverbal
intelligence. In addition, the difficulty index of CTONI, and the differences of
intelligence with regard to gender, program of study, and GPA were determined and
investigated.
The samples of the study were 123 high school students from Samsen
Witthayalai School. The subjects were divided into two groups, where both groups
were assessed with CTONI and WASI-T, in counterbalanced order.
Results revealed that CTONI cannot differentiate between verbal and
nonverbal abilities, but is specific to nonverbal intelligence. This may be due to the
difference of medium used to assess verbal abilities, where CTONI utilizes pictures
while WASI-T uses the actual vocabulary, which require a more in depth
understanding of specific words. Moreover, although the difficulty index of
CTONI was found to be relatively easy, biases regarding the illustrated pictures
still persisted. Differences in intelligence regarding gender were not significant,
but Sciences students tended to have higher IQ scores than Arts students, and a
higher GPA tends to indicate a higher IQ score.