Impossible to remember.
EDIT: unable to reply to your reply since it seems we have reached the maximum depth of this thread, but have you considered that judging race by appearance is... racist (and unreliable)?
If that's not your concern, then I've lost track of what your complaint is.
[EDIT] Reply to your edit: Yes, that's... the point? [EDIT AGAIN] Wait, are you saying that it's racist for the researchers to categorize pedestrians' races based on appearance? If so, I'd regard that objection as specious. That's not racist. Having-to-do-with-race isn't what racism is. It could be inaccurate (or not!) but it's not racist. In any event, it seems they didn't actually measure a difference in reaction of pedestrians based on their own race (!) so it may not be relevant anyway.
That’s a legitimate concern since the methodology on how “racial phenotypes” of “Black” and “non-Hispanic White” were identified for the confederate pairs is not identified. We know their assessment of the race of the subjects whose behavior is studied is measurably lower than 100%, because they actually have reliability data on that by comparison with a second rater.
Yes. I thought that was obvious from the first comment I made. Sorry if I wasn't more clear.
> it may not be relevant anyway
My main complaint was the lack of scientific rigor. It's relevant in other ways because of this.