Heart rate and the role of the active receiver during contingent electric shock for severe self-injurious behavior.
Simply wearing the contingent shock unit cut heart rate, hinting the device itself can calm some clients.
01Research in Context
What this study did
Chou et al. (2007) watched heart rate while clients wore a small shock device. The device could deliver a quick shock if self-injury happened.
The team wanted to know if simply wearing the unit changed stress. They compared heart rate when the unit was on versus when it was off.
What they found
Heart rate went down when the device was attached. Lower heart rate usually means lower anxiety.
The clients seemed calmer when the shock tool was present, even before any shock was given.
How this fits with other research
Meyns et al. (2012) also saw heart rate drop during negative states in clients with severe ID. Both studies treat a slower pulse as a sign of less distress.
van Swieten et al. (2025) reviewed many papers and found no clear heart-rate marker for self-harm. The 2007 single case looks like an exception, but the review pooled very different methods.
Neely et al. (2025) used wrist accelerometers to spot self-hits during a functional analysis. Their wearable tech extends the idea of adding body sensors to SIB work, moving from heart rate to motion.
Why it matters
If wearing the device itself lowers arousal, you may be able to ease anxiety before treatment starts. Check pulse-oximetry with and without any aversive tool to see if the same calming effect happens for your client. Pair the data with clear behavior measures so you treat the whole picture, not just the numbers.
Want CEUs on This Topic?
The ABA Clubhouse has 60+ free CEUs — live every Wednesday. Ethics, supervision & clinical topics.
Join Free →Take a 30-second pulse-ox reading before and after you attach any medical or treatment device to see if presence alone changes stress.
02At a glance
03Original abstract
Five individuals, who were treated for severe self-injurious behaviors with contingent electric shock, participated. Hereby, each occurrence of the target response was followed by a remotely administered aversive consequence. Participants' heart rates were compared at times when the active device of the equipment for the above procedure was attached to their body and when the active device was detached. Although typical response patterns emerged across the participants results demonstrated that heart rates were lower when the active device was attached, tentatively supporting the notion that anxiety and stress may be collateral to participants' SIB.
Research in developmental disabilities, 2007 · doi:10.1016/j.ridd.2005.05.010