The Performance IQ is a measure of fluid reasoning, spatial processing, attentiveness to details, and visual-motor integration.
"Researchers conducted a family-based association study of two independent cohorts of children and adults to investigate whether the synaptosomal-associated protein of 25 kDa (SNAP-25) gene plays a role in human intelligence. The SNAP-25 gene has been reported to be related with learning and memory, which are two major components of intelligence. In total, 12 tag-SNPs were selected for genotyping. The performance IQ (PIQ) was assessed with the Dutch version of the Wechsler Intelligence Scale. The performance subtests included block design and object assembly for children and picture completion, block design, matrix reasoning and digit-symbol substitution for adults. The result showed that the G allele of rs363039 was significantly associated with higher performance IQ in the young cohort (N=381) and combined analysis of the young and adult cohort (N=652). In the combined analysis, rs363039 also showed significant associations in both verbal IQ and full-scale IQ in the same direction of effect."
https://www.ncbi.nlm.nih.gov/pubmed/16801949
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