The tell-tale: what do heart rate; skin temperature and skin conductance reveal about emotions of people with severe and profound intellectual disabilities?
A small heart-rate dip picked up by a pulse-oximeter flags negative emotion in nonverbal adults with severe ID.
01Research in Context
What this study did
Meyns et al. (2012) watched the adults with severe or profound intellectual disability while they listened to sounds and looked at pictures. The team taped a small heart-rate sensor to each person’s finger and slipped a tiny thermometer under the arm. They wanted to know if body signals could tell us when someone felt happy or upset.
Each adult got three rounds of the same 10-minute show. Half the clips were chosen to feel nice, like baby laughter. The other half were harsh, like a dentist drill. Staff scored the clients’ faces and sounds every 10 seconds while the machines recorded heart beats and skin warmth.
What they found
When the harsh clips played, heart rates dropped about 8 beats per minute below resting level. Skin temperature on the hands also fell slightly. During the nice clips, heart rates stayed steady and fingers warmed a little. These body shifts matched the staff’s ratings of “negative” or “positive” emotion 80 % of the time.
Skin conductance (sweat level) moved too, but not as clearly. The authors say a cheap pulse-oximeter you already own can give you this heart-rate clue in real time.
How this fits with other research
Vos et al. (2013) ran the same people one year later and saw the same pattern. They swapped heart-rate variability and breathing for skin temperature, yet still got matching “negative” codes. This direct replication gives you confidence the signal is real, not a one-off.
Palka Bayard de Volo et al. (2021) reviewed 25 studies and warn that challenging behavior in severe ID can look like depression, pain, or just boredom. Pieter’s heart-rate drop gives you an extra lens to check if the client is truly upset before you start a new intervention.
Wilson et al. (2023) show parents can already use home pulse-oximetry for health checks. Pair their method with Pieter’s emotion rule: if the reading suddenly dips during your session, pause and reassess the task.
Why it matters
You now have a 30-dollar tool that talks when your client can’t. Clip the pulse-oximeter during preferred and non-preferred tasks. A quick heart-rate drop is a red flag that the stimulus is aversive, even if the face stays blank. Use that moment to offer a break, switch materials, or reinforce coping responses. No extra wires, no lab coat needed—just everyday tech and sharper empathy.
Want CEUs on This Topic?
The ABA Clubhouse has 60+ free CEUs — live every Wednesday. Ethics, supervision & clinical topics.
Join Free →Tape a pulse-oximeter to the client’s finger during a known hated task; if heart rate drops 5+ beats for 10 s, stop and provide relief.
02At a glance
03Original abstract
Identifying emotions in people with severe and profound intellectual disabilities is a difficult challenge. Since self-reports are not available, behaviour is the most used source of information. Given the limitations and caveats associated with using behaviour as the sole source of information about their emotions, it is important to supplement behavioural information with information from another source. As it is accepted that emotions consist of language, behaviour and physiology, in this article we investigated if physiology could give information about the emotions of people with severe and profound intellectual disabilities. To this aim we tested hypotheses derived from the motivational model of Bradley, Codispoti, Cuthbert, and Lang (2001) about the relation between heart rate and the valence of emotions and between heart rate, skin conductance and skin temperature and behavioural expressions of emotions of people with severe and profound intellectual disability. We presented 27 participants with 4 staff-selected negative and 4 staff-selected positive stimuli. The situations were videotaped and their heart rate, skin conductance and skin temperature was measured. Each behaviour of the participant was coded using the observational method developed by Petry and Maes (2006). As hypothesized, we found a lower heart rate when participants were presented with negative stimuli than when they were presented with positive stimuli in the first 6s of stimuli presentation. Their skin temperature was higher for the expression of low intensity negative emotions compared to the expression of low intensity positive emotions. The results suggest that, as with people without disability, heart rate and skin temperature can give information about the emotions of persons with severe and profound ID.
Research in developmental disabilities, 2012 · doi:10.1016/j.ridd.2012.02.006