BrainTypeIQ's overall IQ is not a raw count of correct answers. Each of the nine tasks is scored separately and converted to a task score on a common scale before the five domains, GAI, CPI, and overall IQ are calculated.
BrainTypeIQ calculates scores in four stages
The path from your answers to the reported results is:
| Stage | Process | Output |
|---|---|---|
| 1. Score each task | Apply the scoring rules to answers or performance within the time limit | Nine raw scores |
| 2. Convert to task scores | Apply the comparison norms and age adjustments | Nine task scores on a common scale |
| 3. Calculate composite scores | Combine the relevant task scores | Five domains, GAI, CPI, and overall IQ |
| 4. Calculate brain type | Classify the pattern across the cognitive scores | Nine types and 27 profiles |
The IQ score scale and percentile bands use a mean of 100 as their reference point.
How the nine tasks are scored
The eight tasks covering vocabulary, reasoning, visuospatial processing, and memory produce a raw score from the number of correct answers. Symbol Search, which measures processing speed, reflects both the number processed correctly within the time limit and the number of errors.
Because the tasks differ in question count, difficulty, and response format, the same raw score does not have the same meaning in every task. Each raw result is compared with the standard for that task and converted to a score that can be combined with the other tasks.
The nine-task and five-domain measurement design shows what each task measures and how the tasks are assigned to domains.
How Japanese-version norms and age adjustments are used to calculate task scores
For the Japanese version, distributions for each task were built from 841 eligible first-time completers whose results met the analysis conditions. A raw score is mapped against the distribution for its task, placing all nine tasks on a common scale.
The conversion also reflects the relationship between age and cognitive performance. This allows performance on tasks that tend to vary with age to be compared among people of the same age.
The Japanese-version norming analysis publishes the selection criteria for the 841 participants, the use of age information, and the checks applied to the norm data. English-language results currently use provisional scoring while a dedicated English dataset accumulates.
How nine tasks become five domains, GAI, CPI, and overall IQ
Once converted to the common scale, the task scores are used as follows:
| Result | Tasks used in the calculation |
|---|---|
| Five domains | The tasks assigned to Gc, Gf, Gv, Gwm, and Gs |
| GAI | The tasks assigned to Gc, Gf, and Gv |
| CPI | The tasks assigned to Gwm and Gs |
| Overall IQ | All nine tasks |
Overall IQ summarizes performance across all nine tasks, while the five domains show the pattern across different cognitive abilities. GAI combines verbal comprehension, fluid reasoning, and visuospatial processing, while CPI combines working memory and processing speed. The reliability and measurement error analysis explains the precision of these composite scores.
Brain type classification is not determined by a separate questionnaire. It is derived from the pattern across the cognitive scores calculated through these stages. How to read the BrainTypeIQ report explains how to interpret overall IQ, the five domains, GAI, CPI, and brain type together.