In a study published this month in PLOS ONE, researchers from the University of Tsukuba have shown that motor task performance in participants was significantly enhanced by praise from either one or two robots or virtual agents.

Although praise from robots and virtual agents has been found to enhance human motivation and performance during a task, whether these interactions have similar effects on offline skill consolidation, which is an essential component of the learning process, has not been investigated. Further, the various conditions associated with the delivery of praise by robot and virtual agents have not been thoroughly explored previously. The researchers at the University of Tsukuba aimed to address these questions in the present study.

"Previous studies have shown that praise from others can positively affect offline improvements in human motor skills," says first author Masahiro Shiomi. "However, whether praise from artificial beings can have similar effects on offline improvements has not been explored previously."

To examine these questions, the researchers asked participants to learn a finger-tapping task under several different conditions, which varied in terms of the timing and frequency of praise, the number of agents, and whether the agents were physically present or presented on a screen. The participants were then asked to repeat the task on the following day, and task performance was compared between the two days.

"We found that praise led to a measurable increase in task performance, indicating increased offline consolidation of the task," explains Professor Takamasa Iio. "Further, two agents led to significantly greater participant performance than one agent, even when the amount of praise was identical."

However, whether the praise was delivered by physical robots or by virtual agents did not influence the effects.

"Our study showed that praise from artificial beings improved skill consolidation in a manner that resembled praise delivered by humans," says first author Masahiro Shiomi. "Such findings may be useful for facilitating learning in children, for instance, or for exercise and rehabilitation applications."

Future work could consider the effects of praise delivered in different environments, for instance, in a VR environment, as well as the effects of greater numbers of agents. A greater understanding of the factors that influence the social effects of robot behavior is essential for improving the quality of human-robot interactions, which are increasingly an important element of education, services, and entertainment applications.

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Materials provided by University of Tsukuba. Note: Content may be edited for style and length.

Journal Reference:

1. Masahiro Shiomi, Soto Okumura, Mitsuhiko Kimoto, Takamasa Iio, Katsunori Shimohara. Two is better than one: Social rewards from two agents enhance offline improvements in motor skills more than single agent. PLOS ONE, 2020; 15 (11): e0240622 DOI: 10.1371/journal.pone.0240622