Can a Robot Cure Loneliness? What the Paro and ElliQ Trials Really Show

Robotic seals and chatty tabletop companions are increasingly sold as an answer to isolation in later life, but the randomised evidence is smaller, messier and more interesting than the marketing suggests.

A problem looking for a product

Loneliness in older age is a genuine public health concern, and it lands in a sector chronically short of staff. It is no surprise, then, that companion robots have been pitched as part of the solution. The best known is Paro, a furry robotic baby harp seal that responds to touch and voice with movements and cries. A newer generation, typified by ElliQ, is a talkative tabletop device that starts conversations, suggests activities and nudges people about their health. The question for anyone deciding whether to buy one, fund one or worry about one is simple: does it work?

The New Zealand trial

One of the most cited studies is a randomised controlled trial by Hayley Robinson, Bruce MacDonald, Ngaire Kerse and Elizabeth Broadbent, published in 2013 in the Journal of the American Medical Directors Association. Forty residents of a hospital and rest home facility were randomised either to sessions with Paro, twice a week for an hour over twelve weeks, or to their normal activities. Compared with the control group, residents who spent time with the robot showed a significant drop in loneliness over the trial period. The robot also became a talking point among residents, which hints at one plausible mechanism: Paro may work partly as a social catalyst between people rather than as a substitute for them.

It is a real result, but a small one. Forty people in a single setting cannot tell us how large or durable the effect is in general, and the comparison was with usual activities rather than with another engaging object.

What about a cuddly toy?

That second point turns out to matter. In 2017 Wendy Moyle and colleagues reported a much larger cluster-randomised trial in Australia, involving 415 people with dementia across 28 long-term care facilities. Facilities were assigned to Paro, to a look-alike plush toy with its robotic features switched off, or to usual care. Video coding showed that Paro improved some mood states and reduced agitation compared with usual care, and participants were more verbally and visually engaged with the robot than with the toy. But on a standard agitation questionnaire there was no difference between groups, and the plush toy produced some of the same mood improvements over usual care. The authors' own conclusion was that Paro outperformed the toy mainly on engagement.

Loneliness was not the primary outcome here, so this study does not directly test that claim. What it does show is how much of the benefit of a companion object may come from having something soft and attention-worthy to hold, rather than from clever robotics.

The view from the meta-analysis

Pu, Moyle, Jones and Todorovic tried to put the randomised evidence together in a systematic review and meta-analysis in The Gerontologist, published online in 2018 and in print in 2019. From more than two thousand articles they found eleven randomised trials, nine of which could be pooled. Social robots appeared to help with agitation, anxiety and quality of life, but none of these effects reached statistical significance in the meta-analysis. The narrative part of the review was more upbeat, pointing to improvements in engagement, interaction, stress indicators, loneliness and medication use. The authors concluded that the potential is real but the evidence is limited by small, high-risk-of-bias studies, especially weaknesses in allocation concealment and blinding.

ElliQ and the proactive turn

ElliQ represents a different design idea: instead of waiting to be stroked, it initiates contact, offering conversation, music, video calls, wellbeing check-ins and cognitive games. A 2024 paper by Elizabeth Broadbent and colleagues described the system and reported that it had been deployed through fifteen US government agencies. Early experience, the authors wrote, suggests it is highly engaging and may reduce loneliness and improve quality of life. That is a reasonable description of an emerging product, but it is a progress report, not an independent controlled trial, and readers should weigh it accordingly.

So, does it work?

The honest answer is: sometimes, a bit, for some people, and we are not yet sure why. The best randomised studies suggest companion robots can lift mood and engagement in care settings, and at least one small trial found a reduction in loneliness. But the effects are modest, the trials are few, and the strongest comparison, against a non-robotic toy, takes some of the shine off the technology itself.

There is also a design lesson. The most promising effects tend to appear when a robot gives people something to talk about with each other. A companion that strengthens human contact is a very different proposition from one that quietly replaces it, and the evidence so far gives us more reason to build the first kind than the second.

References

1. Robinson, H., MacDonald, B., Kerse, N. and Broadbent, E. (2013). The Psychosocial Effects of a Companion Robot: A Randomized Controlled Trial. Journal of the American Medical Directors Association, 14(9), 661-667. Link
2. Moyle, W., Jones, C., Murfield, J., Thalib, L., Beattie, E., Shum, D., O'Dwyer, S., Mervin, M. C. and Draper, B. (2017). Use of a Robotic Seal as a Therapeutic Tool to Improve Dementia Symptoms: A Cluster-Randomized Controlled Trial. Journal of the American Medical Directors Association. Link
3. Pu, L., Moyle, W., Jones, C. and Todorovic, M. (2019). The Effectiveness of Social Robots for Older Adults: A Systematic Review and Meta-Analysis of Randomized Controlled Studies. The Gerontologist, 59(1), e37-e51. Link
4. Broadbent, E., Loveys, K., Ilan, G., Chen, G., Chilukuri, M. M., Boardman, S., Doraiswamy, P. M. and Skuler, D. (2024). ElliQ, an AI-Driven Social Robot to Alleviate Loneliness: Progress and Lessons Learned. The Journal of Aging Research and Lifestyle, 13. Link

Feature drafted with AI from the published research listed above, for social-robotics.com.