Large Discrepancy between the Verbal Comprehension and the Perceptual Reasoning Index on the WISC IV
By Inderbir Kaur Sandhu, Ph.D
Q:
Thank you for the very informative website. My 9 year and 11 month old
son recently took a psychoeducational assessment and the results came
out to be quite uneven. For instance, in the WISC IV, he scored a VCI of
152 and PRI of 115, WMI of 135 and Processing Speed of 106. Due to the
37 points difference in VCI and PRI score, an FSIQ score was not
derived.
They also did the WC III test and the results are as follows:
-
Visual-Spatial Thinking 109 (Spacial Relation 117/Pic Recognition 98)
-
Processing Speed 121 (Visual Matching 121/Decision Speed 116)
-
Long-term Retrieval 108 (V-A Learning 111/V-A Delayed 109/Retrieval Fluency 95
-
Phonemic Awareness 112 (Sound Blending 116/Incomplete Words 99)
-
Auditory Processing 122 (Sound Blending 116/Auditory Attention 119)
-
Working Memory 144 (Numbers Reverse 152/Auditory WM 120)
In the WIAT-III, he scored:-
Reading 123
Math 144
Language 136
In WJ-III Tests of Achievement, he scored:- Academic Fluency 154 Broad
Written Language 141
Due to the social skill problems reported by the school, the assessor
opined he has Asperger Syndrome.
Based on the achievement tests taken, he does not appear to have a major
learning disability. Is the big discrepancy between the WISC-IV VCI and
PRI score a concern? Can we tell if he is gifted based on these test
results and he tends to be quite bored at school? Grateful if you can
share your insights. Many thanks in advance.
A:
The results surely indicate a rather mixed score which makes it
difficult for determination and selection purposes. What is obvious is
that his scores are definitely way higher than his peers, especially for
VCI and WMI. It is also true (based on research) that the VCI is the
best measure of giftedness. So, simply answered, yes, your son's score
is definitely in the gifted range.
It is hard to determine any learning disability without further testing
but based on the WISC IV alone, it does not appear to be the case since
his PRI and PSI, although did not hit the mark for the average gifted
child, the scores are very close to the borderline index. There is an
underlying concern here, but it hard to pinpoint exactly what it may be
unless perhaps he is seen by a professional and diagnosed based on a few
tests.
The FSIQ can only be interpreted if it represents a unitary construct of
cognitive abilities and in your son's case, due to the large gap, the
FSIQ is not unitary, hence the focus on subtests scores. I am not sure
if the scores suggest Asperger's Syndrome but a neurological issue may
be a possibility especially as since the assessor suggested this which
is probably based on reports and observation. This needs to be further
clarified.
I'm afraid I can only suggest so much as I believe there is much more to
this and your son needs to undergo other tests to rule out some
concerns. I do think there is concern for such a huge gap between the VCI
and PRI. Please seek further help.
Good luck and wishing you all the best..
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