IMS_Blog

Even though these escalators aren’t working a few thousand (I’d imagine) people still want to move along that route each day, myself included. Which means walking up and down the stationary escalators. That gives rise to the familiar “broken escalator phenomenon”, a momentary lurching as one steps on or off the escalator unconsciously expecting motion and finding none. I mention this because I finally decided to check at lunch time that my memory was correct and this is a known phenomenon and not just me. A quick Google found a sequence of papers by Reynolds & Bronstein, et al., beginning with one in Experimental Brain Research (2003, vol. 151, pg 308) which looked at a closely related experience involving stepping onto a moving walkway (reading through it seems that there are a couple of reasons it might not be quite the same phenomenon, but it’s pretty close and offers insight)^[a].

None of this would really be too interesting but for the fact that one thing that caught my eye was that the momentary jarring seems to be down to an unconscious increase in gate speed on approach to the walkway (and, by extension, escalator). So on the way home tonight, when I approached the still bloody broken escalators, I very deliberately slowed myself down. This did have the effect of reducing the normal broken escalator phenomenon (or, at least, it subjectively felt reduced). More interestingly, it induced the distinct visual hallucination that the escalator was moving downwards towards me (I was heading upwards). It seems that my reduction of my own speed has translated into a perceived reduction in the velocity of the escalator away from me, to the point where that was towards me. This is not any less disorientating than the normal phenomenon.

The question remains what am I going to try tomorrow if the escalators are still broken? Attempting to tackle them backwards seems both dangerous and open to ridicule. However, perhaps twisting at the last moment to board them sideways may change the perception. I’m fairly sure that I tend to step onto escalators with my right foot too, so using the left may have an affect. Experimental science in action!

More: This morning the escalators were still out of action, so I took the opportunity to attempt stepping onto them sideways (twisting as I made the first step). I feel the experiment might have been somewhat contaminated due to the fact that the simple mass of people was reducing the normal approach speed anyway, however, there was still a definite reduction iin the disorientation, although no induced illusions this time (perhaps because I wasn’t looking directly at the escalator and couldn’t see as much of it, travelling down, anyway). On the way home the escalators were 75% operational and I’m too lazy to walk up the one which was still out of action ;-)

[a] See also J. Neurophysiol. 91 92 (2004) and Exp Brain Res. 174 270 (2006)