Does success at second language learning depend instead on a person's IQ or aptitude?

The success in second language learning depends on a variety of factors, not just a person's IQ or aptitude. Here are some key factors:

1. Motivation: This is perhaps the most important factor. If a person is motivated and has a strong desire to learn, they are more likely to succeed.

2. Exposure: Regular exposure to the language, whether through studying, speaking, or listening, can greatly improve a person's ability to learn a second language.

3. Practice: Like any skill, practice is key. The more a person practices speaking, reading, and writing in the language, the better they will become.

4. Teaching methods: The way the language is taught can also have a big impact. Methods that involve real-life communication, for example, are often more effective than those that focus solely on grammar and vocabulary.

5. Age: While it's never too late to learn a new language, research suggests that younger people may have an easier time picking up a second language.

6. Aptitude: Some people do have a natural aptitude for languages. However, this is just one factor and not the determining one.

7. IQ: While a higher IQ can make language learning easier, it's not a prerequisite for success. Many people with average IQs are also successful language learners.

In conclusion, while IQ and aptitude can play a role in second language acquisition, they are not the only factors. Motivation, exposure, practice, teaching methods, and age are also important.