There have been a variety of studies of various forms of trustworthiness; I don’t have a strong preference for any of those I’ve heard of (I tend to favor many different kinds of studies, generally). I’d previously seen one or two of Schwitzgebel’s papers, but those I’d seen before hadn’t made distinctions between different kinds of ethicists. Looking at his web page, I see that he does have at least one paper I hadn’t seen before which tries to do that, though the samples are not large. Still, as you say, it detects nothing, which does suggest at least that if there is an effect it probably isn’t large.
There have been a variety of studies of various forms of trustworthiness; I don’t have a strong preference for any of those I’ve heard of (I tend to favor many different kinds of studies, generally). I’d previously seen one or two of Schwitzgebel’s papers, but those I’d seen before hadn’t made distinctions between different kinds of ethicists. Looking at his web page, I see that he does have at least one paper I hadn’t seen before which tries to do that, though the samples are not large. Still, as you say, it detects nothing, which does suggest at least that if there is an effect it probably isn’t large.