ISTJ Average IQ

ISTJs combine dominant introverted Sensing (Si) with auxiliary extraverted Thinking (Te). Si gives them an exceptional memory for details and established procedures, while Te provides logical, systematic reasoning. This combination makes them meticulous and reliable cognitive processors. On IQ tests, ISTJs tend to score solidly above average, with particular strength on subtests that reward careful attention to detail, sequential reasoning, and working memory. Their methodical approach means they rarely make careless errors, and their Te helps them work efficiently through logical problems. However, ISTJs may score lower on subtests that require highly abstract or creative thinking, as their Si naturally orients them toward the concrete and the proven. They may also find open-ended pattern recognition tasks less intuitive than tasks with clear, step-by-step logical structure. Their cognitive strength lies in reliability, depth, and precision rather than novelty and abstraction. As one of the most common types, their average is naturally closer to the population mean.