Five cognitive domains, one composite score
MindRank IQ measures five reasoning domains, each mapped to a Cattell-Horn-Carroll (CHC) broad ability and modeled on the ICAR public-domain item catalog. Click any domain for the deep explainer, sample items, and brain-training guides.
Pattern Recognition
Visual sequences, matrices, abstract rules
Numerical Reasoning
Arithmetic series, ratios, quantitative logic
Verbal Reasoning
Analogies, vocabulary, semantic relationships
Spatial Reasoning
3D rotation, mental folding, perspective
Logical Deduction
Syllogisms, conditional inference, ordering
Why these five
The five domains were chosen to cover both fluid reasoning (pattern recognition, numerical series, spatial rotation, logical deduction) and crystallized verbal knowledge. Together they sample the dimensions that load most heavily on the general factor 'g' in modern psychometric models, while remaining short enough to administer in about twelve minutes online.
If you are curious about the full theoretical framework, the Cattell-Horn-Carroll model article is the right starting point. The g factor explainer covers what makes these five domains correlate in the first place.