How muggers size up your walk

The way people move can influence the likelihood of an attack by a stranger. The good news, though, is that altering this can reduce the chances of being targeted.

How you move gives a lot away. Maybe too much, if the wrong person is watching. We think, for instance, that the way people walk can influence the likelihood of an attack by a stranger. But we also think that their walking style can be altered to reduce the chances of being targeted.

A small number of criminals commit most of the crimes, and the crimes they commit are spread unevenly over the population: some unfortunate individuals seem to be picked out repeatedly by those intent on violent assault. Back in the 1980s, two psychologists from New York, Betty Grayson and Morris Stein, set out to find out what criminals look for in potential victims. They filmed short clips of members of the public walking along New York’s streets, and then took those clips to a large East Coast prison. They showed the tapes to 53 violent inmates with convictions for crimes on strangers, ranging from assault to murder, and asked them how easy each person would be to attack.

The prisoners made very different judgements about these notional victims. Some were consistently rated as easier to attack, as an “easy rip-off”. There were some expected differences, in that women were rated as easier to attack than men, on average, and older people as easier targets than the young. But even among those you’d expect to be least easy to assault, the subgroup of young men, there were some individuals who over half the prisoners rated at the top end of the “ease of assault” scale (a 1, 2 or 3, on the 10 point scale).

The researchers then asked professional dancers to analyse the clips using a system called Laban movement analysis – a system used by dancers, actors and others to describe and record human movement in detail. They rated the movements of people identified as victims as subtly less coordinated than those of non-victims.

Although Professors Grayson and Stein identified movement as the critical variable in criminals’ predatory decisions, their study had the obvious flaw that their films contained lots of other potentially relevant information: the clothes the people wore, for example, or the way they held their heads. Two decades later, a research group led by Lucy Johnston of the University of Canterbury, in New Zealand, performed a more robust test of the idea.

The group used a technique called the point light walker. This is a video recording of a person made by attaching lights or reflective markers to their joints while they wear a black body suit. When played back you can see pure movement shown in the way their joints move, without being able to see any of their features or even the limbs that connect their joints.

Research with point light walkers has shown that we can read characteristics from joint motion, such as gender or mood. This makes sense, if you think for a moment of times you’ve recognised a person from a distance, long before you were able to make out their face. Using this technique, the researchers showed that even when all other information was removed, some individuals still get picked out as more likely to be victims of assault than others, meaning these judgements must be based on how they move.

Walk this way

But the most impressive part of Johnston’s investigations came next, when she asked whether it was possible to change the way we walk so as to appear less vulnerable. A first group of volunteers were filmed walking before and after doing a short self defence course. Using the point-light technique, their walking styles were rated by volunteers (not prisoners) for vulnerability. Perhaps surprisingly, the self-defence training didn’t affect the walkers’ ratings.

In a second experiment, recruits were given training in how to walk, specifically focusing on the aspects which the researchers knew affected how vulnerable they appeared: factors affecting the synchrony and energy of their movement. This led to a significant drop in all the recruits’ vulnerability ratings, which was still in place when they were re-tested a month later.

There is school of thought that the brain only exists to control movement. So perhaps we shouldn’t be surprised that how we move can give a lot away. It’s also not surprising that other people are able to read our movements, whether it is in judging whether we will win a music competition, or whether we are bluffing at poker. You see how someone moves before you can see their expression, hear what they are saying or smell them. Movements are the first signs of others’ thoughts, so we’ve evolved to be good (and quick) at reading them.

The point light walker research a great example of a research journey that goes from a statistical observation, through street-level investigations and the use of complex lab techniques, and then applies the hard won knowledge for good: showing how the vulnerable can take steps to reduce their appearance of vulnerability.

My BBC Future column from Tuesday. The original is here. Thanks to Lucy Johnston for answering some of my queries. Sadly, and suprisingly to me, she’s no longer pursuing this line of research.

12 Comments

  1. Mark Tyrrell
    Posted November 8, 2013 at 10:21 am | Permalink

    Really interesting that the self defence course,which probably increased confidence made no difference. I wonder whether the less coordinated ‘victim’ walkers were also more likely to be bullied at work or have been as children. I knew a guy who had been randomly mugged no less that four times-once almost being thrown off a London bridge and once being attacked on the beach and having his throat cut. He was quite tall and young and not the type to invite trouble so it may well have been he fitted the victim mover profile. Great that by changing movement style people can become less vulnerable.

    • Posted November 13, 2013 at 6:38 am | Permalink

      It would have been better if it was mentioned what exactly are the types of moves which are more vulnerable. Don u think so?

  2. nancylebovitz
    Posted November 8, 2013 at 12:41 pm | Permalink

    The research didn’t look at the possible effects of extended martial arts study.

  3. Posted November 8, 2013 at 1:35 pm | Permalink

    The obvious next step is to take the point-light videos and have them rated by inmates in a similar way to the original study.

    And if that pans out, then it’s time to figure out exactly what differs between those that learn how to walk confidently and those that learn martial arts; as martial arts will increase actual confidence there should be some other factor that determines the final impression.

  4. Barry Hamilton
    Posted November 8, 2013 at 4:40 pm | Permalink

    Very interesting article. How about some details on the factors that reduce vulnerability ratings? Details that we can put into practice.

  5. Posted November 8, 2013 at 4:47 pm | Permalink

    I’d like to see the point light walker movements of martial arts (tai chi, yoga etc) movements compared to the general population. Do practices like that change how people walk? I think a “short martial arts class” might cause someone to overthink how they carry themselves.

    Conventional wisdom; that is, the media,tells women that attackers want an easy target, not someone who looks like they might fight back. Personally though, when I’m in the woods, my strategy is to wear black (see, I pay attention). :)

  6. Jimi
    Posted November 8, 2013 at 10:19 pm | Permalink

    Extensive martial arts training does indeed change the way a person walks. A self defense course would probably not be sufficient, however.
    We were well aware of the concept behind this study in our dojo years ago, and specifically taught it to our students.

  7. Chris M
    Posted November 11, 2013 at 3:55 am | Permalink

    I’m a bit surprised they would do all of this research and then not a post a video of how to actually walk safer.

  8. tomstafford
    Posted November 13, 2013 at 6:57 am | Permalink

    Hi all

    Yes, it would be better to include more details on the walks of vulnerable vs less vulnerable people. I did include the headlines from the articles (vulnerable walks are less synchronised, less energetic), but it was hard to find and include more details in a meaninful way.

    I wrote to Lucy Johnson, who said that the original tapes got lost in the 2011 earthquake (!). An example of a vulnerable walk of the style of this demo http://www.biomotionlab.ca/Demos/BMLwalker.html simply doesn’t exist. So, for the moment, sorry I can’t be more explicit – there isn’t a video to illustrate this research. I can only recommend you go to the original papers if you want the full details of the movement analysis. If anyone is able to summarise these in a neat, laypersons, format then let me know and we can post it here and on BBC Future.

  9. stovepipe
    Posted December 7, 2013 at 12:02 pm | Permalink

    Movement analysis is also probably applicable to promotion in the corporate & military (i.e., authoritarian) environment.

    I’ve known a number of corporate and military officers who walk with confidence but have little accomplishment (and quite often a string of failures).

    Could you imagine Bill Gates being promoted if he had begun his career at IBM or Xerox?

  10. Joe in TX
    Posted December 12, 2013 at 4:57 am | Permalink

    Here is how simple it is … my Dad was a UDT Navy vet always says move with a purpose. Set your eyes, square your shit away, shoulders back and focus past any threat. See everything, head on a swivel and most importantly think “I will attack”… MEAN IT!!!


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