I recently underwent neuro-psychological evaluation to investigate my long-standing suspicion that I suffer from ADHD. As part of that evaluation, I was given the WAIS-IV, and obtained these scores:
VCI: 138
PRI: 111
WMI: 136
PSI: 84
The >3SD spread between my VCI and PSI scores, along with other results of the evaluation, confirmed a diagnosis of ADHD.
The wide discrepancies between my scores raises an interesting question: what single number should be used for my IQ? Clearly, wide variations in my scores renders the FSIQ meaningless. It's my understanding that the VCI is often regarded as the "first among equals" of the Wechsler scales, and offers the best correlation with Stanford-Binet IQ. The problem, though, is that recent editions of the Stanford-Binet test have also shifted to multiple scores.
Can anyone point me to hard evidence that the VCI (or some other Wechsler scale) correlates best with older Stanford-Binet editions, or other single-scale IQ measures?
Jeff Rosen
