Intellectual linear progression refers to the idea that intelligence and cognitive abilities progress in a linear fashion, meaning that individuals start at one level of intelligence and gradually become more intelligent as they age. This idea was first proposed by psychologist Lewis Terman in the early 20th century and has since been supported by numerous studies.

According to Terman's theory, intelligence is a fixed trait that is determined at birth and does not change significantly over time. He believed that intelligence is influenced by genetics, education, and environment, but that these factors do not significantly impact an individual's overall intelligence quotient (IQ).

However, more recent research has challenged this view, suggesting that intelligence is a complex trait that is influenced by a variety of factors, including genetics, education, and life experiences. For example, studies have shown that children who experience stress or have limited access to resources may have lower IQ scores, even if they come from families with high socioeconomic status.

Additionally, research has found that intelligence is not fixed and can change throughout an individual's life. For example, studies have shown that adults who were initially considered to be mentally challenged as children may later demonstrate exceptional cognitive abilities.

Overall, while the idea of intellectual linear progression has some basis in research, it is important to recognize that intelligence is a complex trait that is influenced by a variety of factors and can change over time.