First the scientific story, then the journalist, then my thoughts.
Part 1: The scientific story
From the Daily News:
Spanking makes kids perform better in school, helps them become more successful: study
The research, by Calvin College psychology professor Marjorie Gunnoe, found that kids smacked before age 6 grew up to be more successful . . . Gunnoe, who interviewed 2,600 people about being smacked, told the [London] Daily Mail: "The claims that are made for not spanking children fail to hold up. I think of spanking as a dangerous tool, but then there are times when there is a job big enough for a dangerous tool. You don't use it for all your jobs."
From the Daily Mail article:
Professor Gunnoe questioned 2,600 people about being smacked, of whom a quarter had never been physically chastised. The participants' answers then were compared with their behaviour, such as academic success, optimism about the future, antisocial behaviour, violence and bouts of depression. Teenagers in the survey who had been smacked only between the ages of two and six performed best on all the positive measures. Those who had been smacked between seven and 11 fared worse on negative behaviour but were more likely to be academically successful. Teenagers who were still smacked fared worst on all counts.
Part 2: The journalist
Po Bronson (whose life and career are eerily similar to the slightly older and slightly more famous Michael Lewis) writes about this study in Newsweek:
Unfortunately, there's been little study of [kids who haven't been spanked], because children who've never been spanked aren't easy to find. Most kids receive physical discipline at least once in their life. But times are changing, and parents today have numerous alternatives to spanking. The result is that kids are spanked less often overall, and kids who've never been spanked are becoming a bigger slice of the pie in long-term population studies.
One of those new population studies underway is called Portraits of American Life. It involves interviews of 2,600 people and their adolescent children every three years for the next 20 years. Dr. Marjorie Gunnoe is working with the first wave of data on the teens. It turns out that almost a quarter of these teens report they were never spanked.
So this is a perfect opportunity to answer a very simple question: are kids who've never been spanked any better off, long term?
Gunnoe's summary is blunt: "I didn't find that in my data." . . . those who'd been spanked just when they were young--ages 2 to 6--were doing a little better as teenagers than those who'd never been spanked. On almost every measure.
A separate group of teens had been spanked until they were in elementary school. Their last spanking had been between the ages of 7 and 11. These teens didn't turn out badly, either.
Compared with the never-spanked, they were slightly worse off on negative outcomes, but a little better off on the good outcomes. . . .
Gunnoe doesn't know what she'll find, but my thoughts jump immediately to the work of Dr. Sarah Schoppe-Sullivan, whom we wrote about in NurtureShock. Schoppe-Sullivan found that children of progressive dads were acting out more in school. This was likely because the fathers were inconsistent disciplinarians; they were emotionally uncertain about when and how to punish, and thus they were reinventing the wheel every time they had to reprimand their child. And there was more conflict in their marriage over how best to parent, and how to divide parenting responsibilities.
I [Bronson] admit to taking a leap here, but if the progressive parents are the ones who never spank (or at least there's a large overlap), then perhaps the consistency of discipline is more important than the form of discipline. In other words, spanking regularly isn't the problem; the problem is having no regular form of discipline at all.
I couldn't find a copy of Gunnoe's report on the web. Her local newspaper (the Grand Rapids News) reports that she "presented her findings at a conference of the Society for Research in Child Development," but the link only goes to the conference website, not to any manuscript. Following the link for Marjorie Gunnoe takes me to this page at Calvin College, which describes itself as "the distinctively Christian, academically excellent liberal arts college that shapes minds for intentional participation in the renewal of all things."
Gunnoe is quoted in the Grand Rapids Press as saying:
"This in no way should be thought of as a green light for spanking . . . This is a red light for people who want to legally limit how parents choose to discipline their children. I don't promote spanking, but there's not the evidence to outlaw it."
I'm actually not sure why these results, if valid, should not by taken as a "green light" for spanking, but I guess Gunnoe's point is that parental behaviors are situational, and you might not want someone reading her article and then hitting his or her kid for no reason, just for its as-demonstrated-by-research benefits.
Unsurprisingly, there's lots of other research on the topic of corporal punishment. A commenter at my other blog found a related study of Gunnoe's, from 1997. It actually comes from an entire issue of the journal that's all about discipine, including several articles on spanking.
(I don't know who is spanked exactly once, but maybe this is #times spanked per week, or something like that. I didn't search for the original source of the graph.)
I agree with the commenter that it would be interesting to see Gunnoe and Straus speaking on the same panel.
Part 3: My thoughts
I can't exactly say that Po Bronson did anything wrong in his writeup--he's knowledgeable in this area (more than I am, certainly) and has thought a lot about it. He's a journalist who's written a book on child-rearing, and this is a juicy topic, so I can't fault him for discussing Gunnoe's findings. And I certainly wouldn't suggest that this topic is off limits just because nothing has really been "proved" on the causal effects of corporal punishment. Research in this area is always going to be speculative.
Nonetheless, I'm a little bothered by Bronson's implicit acceptance of Gunnoe's claims. I get a bit uncomfortable when a reporter starts to give explanations for why something is happening, when that "something" might not really be true at all. I don't see any easy solution here--Bronson is even careful enough to say, "I admit to taking a leap here." Still, I'm bothered by what may be a too-easy implicit acceptance of an unpublished research claim. Again, I'm not saying that blanket skepticism is a solution either, but still . . .
It's a tough situation to be in, to report on headline-grabbing claims when there's no research paper to back them up. (I assume that if Bronson had a copy of Gunnoe's research article, he could send it to various experts he knows to get their opinions.)
Certainly not my area of expertise, but from my reading of The Blank Slate, Pinker claims that many studies similar to this that don't control for genetics are basically worthless.
It seems that identical twins reared apart where one was spanked and the other was not would be one of the only ways to answer this question.