Spearman’s two-factor theory of intelligence, also known as the g-factor theory, was proposed by British psychologist Charles Spearman in the early 1900s.

Major Features of this Theory :

The theory suggests that intelligence is comprised of two factors: a general ability factor (g) and specific ability factors (s).

The general ability factor (g) represents a person’s overall level of cognitive ability, which is the underlying factor that influences performance on all mental tasks. According to Spearman, this factor is responsible for the positive correlations between various cognitive tests.

On the other hand, specific ability factors (s) represent an individual’s unique abilities in specific areas, such as verbal comprehension, numerical reasoning, spatial ability, and so on. These factors contribute to a person’s overall intelligence but are not as important as the general ability factor.

Spearman argued that the general ability factor (g) is related to many aspects of cognitive functioning, including perception, attention, memory, and reasoning. He believed that this factor is largely inherited and is not influenced by environmental factors. However, the specific ability factors (s) can be influenced by education, training, and other environmental factors.

Spearman’s two-factor theory of intelligence has been widely studied and researched over the years. It has been supported by numerous studies that have found positive correlations between various cognitive tests, suggesting the existence of a general factor of intelligence. However, the theory has also been criticized for its oversimplification of the nature of intelligence and for neglecting the importance of non-cognitive factors such as creativity and emotional intelligence.

In summary, Spearman’s two-factor theory of intelligence proposes that intelligence is composed of a general ability factor (g) and specific ability factors (s). The general ability factor is the most important and underlying factor that influences performance on all cognitive tasks, while the specific ability factors are unique abilities that contribute to overall intelligence.

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