Table 1. Theoretical Framework of Factors that can Increase Mentalization of Social Robots.

	Variables		References
Observer Features	Cognitive	Agent knowledge: mind attribution, mental states	Frith & Frith [1]
			Waytz et al. [3]
		Agent behavior: intentionality, motives, cause of behavior	Dennett [5]
			Wiese et al. [6]
			Ristic & Kingstone [19]
	Motivation	Effectance	Epley et al. [4]
		Sociality	Ames et al. [11]
			Davis et al. [12]
			Epley et al. [13]
		Sense of control	Kay et al. [10]
Agent Features	Behavior	Predictability	Waytz et al. [3]
			Rosset [9]
		Negative consequences	Morewedge [15]
		Motion pattern	Heider & Simmel [7]
			Abell et al. [16]
			Castelli et al. [17]
			Klein et al. [18]
	Appearance	Similarity to humans	Kiesler [20]
			Looser & Wheatley [21]
		Design type: functional and biologically inspired	Fong, Nourbakhsh, & Dautenhahn [22]

Summarizes the work by Epley et al. [4], Waytz et al. [3], and more recent research.