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Since there is other research indicating that bilingual children on average have a slightly higher IQ, most likely due to the brain being trained to compartmentalise information earlier, I wonder if that effect is notable in these former bilingual children too.

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I thought those studies concerned more that the bi-lingual children had an extra flexibility at understanding a concept, rather than a more developed compartmentalization process.

You may be right, I said this from memory. Maybe we're talking about the same thing from a different perspective though? My recollection was that it had to do with the need to switch between languages.

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