Final answer:
Alfred Binet posited that high intelligence is reflected by a mental age that is higher than the actual age, with individuals having IQ scores significantly above 100, often around 130 or higher, considered to possess higher intelligence or giftedness.
Step-by-step explanation:
According to Alfred Binet, high intelligence would be reflected in a mental age that is higher than the actual age. Binet, a French psychologist, was instrumental in the development of the first intelligence tests which gave rise to the concept of mental age - an estimate of an individual's intellectual developmental level compared to average intellectual levels of populations of actual chronological ages.
The Stanford-Binet Intelligence Scale, evolved from Binet's work, measures intelligence through a variety of verbal, quantitative, and nonverbal subtests. When an individual's mental age is higher than their chronological age, it implies that their cognitive abilities are more advanced compared to the norm for their age group. This is often interpreted as indicative of higher intelligence, and such cases are identified by an IQ score above 100, specifically scores around 130 or higher, which are typically considered in the range of giftedness.