Listen to the words you are using in making your case, " assumes " and " probably true " . This means they are NOT true. Cognitive function is not at all related to the quality of the education one gets. Cognitive Function is defined as brain based skills which are needed in acquisition of knowledge, manipulation and reasoning. This does not vary among human beings. The amount of knowledge people have does vary with the amount of exposure and access to it.Seems like the NFL agrees with me on this.
Race-norming, which assumes Black players start with lower cognitive function.
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NFL agrees to end race-based brain testing in $1B settlement on concussions
The league accepted changes after an outcry over test score adjustments known as "race-norming," which make it harder for retired Black players to win dementia awards.www.npr.org
There is no way the league would have done this if it weren't mostly true. It may be racist to assume but it's probably true for the most part that blacks have a lower cognitive function.