Table 1.

Description of the different types of social robots used in the included studies

Type	Description
CuDDler	Pet robot, robotic teddy bear, moves its neck, arms, eyelids, limbs and vocally interacts with a growl, developed in Singapore [44].
NAO	Humanoid robot, can use oral language (phrases previously recorded) and move like a human, developed in France [35].
PARO	Pet robot, animal-shaped robot, does not use oral language but sounds and moves like an animal/baby seal, developed in Japan [35].
Telenoid	Telepresence robot, alien-shaped robot, transmits voices, mimics, and head motions using an internet connection, developed in Japan [43].
JustoCat	Pet robot, robotic cat developed based on PARO, purrs, meows, and breaths, developed in Sweden [49].