Mathias Brust in Chemistry World:
Ideally, science ought to be self-correcting. … In general, once a new phenomenon has been described in print, it is almost never challenged unless contradicting direct experimental evidence is produced. Thus, it is almost certain that a substantial body of less topical but equally false material remains archived in the scientific literature, some of it perhaps forever.
Philip Moriarty expresses similar concern in a post at Physics Focus. Openly criticising other scientists’ work is generally frowned upon—flaws in the literature are “someone else’s problem”. Erroneous papers sit in the scientific record, accumulating a few citations. Moriarty thinks this is a problem because bibliometrics are (unfortunately) used to assess the performance of scientists.
I think this is a problem too, although for a different reason. During my MRes I wasted a lot of time trying to replicate a nanoparticle synthesis that I’m now convinced is totally wrong. Published in June 2011, it now has five citations according to Web of Knowledge. I blogged about it and asked what I should do. The overall response was to email the authors but in the end I didn’t bother. I wanted to cut my losses and move on. But it still really bugs me that other people could be wasting their limited time and money trying to repeat it when all along it’s (probably) total crap.
I did take my commenters’ advice and email an author about another reaction that has turned out to be a “bit of an art”. (Pro tip: if someone tells you a procedure is a bit of an art, find a different procedure.) I asked some questions about a particular procedure and quoted a couple of contradictions in their papers, asking for clarification/correction. His responses were unhelpful and after a couple of exchanges he stopped replying. Unlike the first case, I don’t believe the results are flat out wrong. Instead I suspect a few experimental details are missing or they don’t really know what happens. I think I’ll get to the bottom of it eventually, but it’s frustrating.
What are your options if you can’t replicate something or think it’s wrong? I can think of four (excluding doing nothing):
Email the corresponding author. They don’t have an incentive to take it seriously. You are ignored.
Email the journal editor. Again, unless they’re receiving a lot of emails, what incentive does the journal have to take it seriously? I suspect you’d be referred to the authors.
Try and publish a rebuttal. Can you imagine the amount of work this would entail? Last time I checked, research proposals don’t get funded to disprove papers. This is only really a viable option if it’s something huge, e.g. arsenic life.
Take to the Internet. Scientists, being irritatingly conservative, think you’re crazy. Potentially career damaging.
With these options, science is hardly self-correcting. I’d like to see a fifth: a proper mechanism for post-publication review. Somewhere it’s academically acceptable to ask questions and present counter results. I think discussion should be public (otherwise authors have little incentive to be involved) and comments signed (to discourage people from writing total nonsense). Publishers could easily integrate such a system into their web sites.
Do you think this would work? Would you use it? This does raise another question: should science try and be self-correcting at all?
Thanks to Adrian for bringing Mathias Brust’s article to my attention.