The latest country-level average IQ data. Download here: https://www.researchgate.net/project/Worlds-IQ/update/5d1a2064cfe4a7968db096ea …pic.twitter.com/VVaOvhXpzu
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Was there an earlier, similar study conducted in Jamaica?
No idea. And yes, that study with the implausible claims was published in Science. About 3.5k citations by now. 
https://science.sciencemag.org/content/244/4907/933 …
https://scholar.google.gr/scholar?hl=en&as_sdt=0%2C5&q=delay+of+gratification&oq=Delay …
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Walter Mischel's Marshmallow Test started out in Trinidad to figure out why Asian Indians were getting richer than blacks: http://www.unz.com/isteve/the-origin-of-the-marshmallow-test/ … His Marshmallow Test confirmed local stereotypes of blacks as more impulsive than South Asians, but somehow it became PC.pic.twitter.com/N79nthndLf
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