21 people per group (86/4) is not a strong result unless it's a large effect size which I doubt. I wouldn't put hardly any faith in this paper. Maybe raise your prior by 3% but it's hard to be that precise with beliefs.
I'd like to see fewer low quality scientific criticisms here. Instead of speculating on effect sizes without reading the paper, and bloviating on sample sizes without doing the relevant power calculations, perhaps try looking at the results section?
With respect to this paper, the results were consistent and significant across three tasks - an eye task, a facial expression task, and a vocal tone task. They did a non-social task (an anagram task) and found no significant effect (though that wasn't the purpose of doing the task, its a bit more complicated tha...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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