Research-Based Design of Pedagogical Agent Roles: a Review, Progress, and Recommendations
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In this paper we review the contribution of our original work titled “Simulating Instructional Roles Through Pedagogical Agents” published in the International Journal of Artificial Intelligence and Education (Baylor and Kim in Computers and Human Behavior, 25(2), 450–457, 2005). Our original work operationalized three instructional roles as simulated through pedagogical agents, and demonstrated the effectiveness of these agent roles on learning and motivation. Since the publication of our work, pedagogical agent research has expanded its scope from the provision of intelligent guidance to a broad interest in agents’ social and affective support for learners. We discuss current progress in pedagogical agent roles and capabilities, and speculate about the future of agent role design. We expect that optimizing the roles of artificial beings including on-screen agents and robots will continue to interest the educational technology community as these technologies continue to evolve.
KeywordsPedagogical agents Experimental research Virtual humans Interface design
Overview of Original Paper
In the early 2000s, there was some empirical support that the presence of a pedagogical agent facilitated deeper learning and enhanced motivation (Atkinson 2002; Moreno et al. 2001). But questions arose about how to create lifelike agents that would be natural and believable (Cassell et al. 2001), and what types of instructional roles and personas could be rendered to impact learning and motivation. These questions were of increasing interest during this time period given that advances in interface technology facilitated easier development of believable 3D animated agents that had synchronized speech and nonverbal communication (e.g., gestures and emotional expressions).
At that time, many intelligent tutoring systems had been focusing largely on facilitating the cognitive processes of learning. Anthropomorphic agents provided a unique opportunity to add a social and emotional quality to the tutoring environments (Graesser et al. 2001; Johnson et al. 2000; Picard et al. 2001) to expand the purview of intelligent tutoring systems research. Given that the use of the interface agents for learning purposes was still new, the AI research community questioned whether a pedagogical agent could add value or if it might distract learners. At the time, there was also great interest in defining an agent’s instructional role or persona, and a variety of roles had been explored, such as tutor, butler, learning companion, collaborator, competitor, trouble maker, etc. (Aimeur and Frasson 1996; Baylor 2000; Chan and Chou 1997; Dillenbourg and Self 1992; Hietala and Niemirepo 1998). None of these studies prior to our work examined the effectiveness of specific agent design features on specific learning outcomes.
Our Approach: Baylor and Kim (2005)
Characterizing agent roles in Baylor and Kim (2005)
Deictic & Emotional
Authoritative & Monotone
Effusive & Enthusiastic
Confident & Calm
Information & Encouragement
For an anthropomorphized agent to be effective, it was important that learners first perceive the agent as intended. We examined the effectiveness of these role instantiations in Experiment 1, with 78 undergraduate students learning computer literacy skills. Each student was randomly assigned to one of the three agent roles (Expert, Motivator, Mentor). In Experiment 2, we further examined the effectiveness of each of the three roles on actual motivation and learning outcomes, with 71 undergraduate pre-service teachers learning instructional design skills. Detailed descriptions of the methodology and dependent measures can be found in the original paper.
For both studies, agent gender, lip synchronization, and script length were controlled to eliminate confounding effects. Additionally, the agent-learner interactions were designed so that each learner received all of the agent guidance. While this limited the “intelligence” of the agents, it ensured that each learner had a similar experience and was necessary for the experimental approach.
The Expert Agent
The Expert was designed to exhibit mastery in the field (e.g., Ericsson 1996; Gonzales et al. 2001). He was operationalized to appear as a mid-life professor. His nonverbal communication (animation) was limited to deictic gestures, and he spoke in a formal and professional manner, with authoritative speech. Being emotionally detached from the learners, his function was to provide accurate information and clearly and succinctly.
The Motivator Agent
The Motivator was designed based on social modeling research that indicated the importance of learners’ efficacy beliefs (Bandura 1997). Given that models with attribute similarity support self-efficacy (Schunk 1989), this agent was designed to represent a peer. He spoke enthusiastically and energetically, while sometimes using colloquial expressions. He was not presented as particularly knowledgeable but as an eager participant who suggested his own ideas, verbally encouraged the learner to sustain at the tasks, and, by asking questions, stimulated the learners to reflect on their thinking. He expressed emotion that commonly occurs in learning, such as frustration, confusion, and enjoyment (Kort et al. 2001); thus, he was not always positive and supportive, but at times demonstrated his difficulty with the content to model coping strategies.
The Mentor Agent
The Mentor agent was designed to represent a guide or coach with advanced experience and knowledge to work collaboratively with the learners to achieve goals. As a mentor, this agent was designed to demonstrate competence to the learner while simultaneously developing a social relationship to motivate the learner (Baylor 2000). Consequently, the appearance of the Mentor was less formal than the Expert, yet older than the peer-like Motivator. The Mentor’s gestures were designed to be identical to the Motivator, incorporating both deictic and emotional expressions. His voice was friendly and approachable, yet more professional and confident than the Motivator. We operationalized the Mentor’s functionality to incorporate the characteristics of both the Expert and Motivator, (i.e., to provide information and motivation); thus, his script was a concatenation of the content of the Expert and Motivator scripts.
Overall, the results of the two experiments revealed that the agent instructional roles were not only perceived by the students to reflect their intended purposes (Experiment 1), but also led to significant changes in learning and motivation, as designed (Experiment 2). Specifically, the motivational agents (Motivator and Mentor) were perceived as more human-like and led to improved learner self-efficacy. However, the affective encouragement and support were not sufficient for the learners to achieve the learning goals (i.e., to facilitate learning). The agents with expertise (Expert and Mentor) led to improved learning outcomes and were perceived as more credible and more facilitating learning. Of the two agents with expertise, the Mentor was perceived to be more engaging and also led to improved self-efficacy, thus having the overall best impact on learning and motivation. This finding paralleled desirable human instructors, in that both students and teachers desired good human instructors to be both supportive and knowledgeable in the domain (Beishuizen et al. 2001; Kim 2007).
Contributions, Impact, and Limitations
We believe that our original work made three important contributions: 1) providing an example of how three agent instructional roles could be systematically constructed and validated; 2) showing that non-intelligent agents could significantly impact the desired learning and motivational goals; and 3) confirming that learners perceived an agent as a whole persona and responded to the agent socially. Prior to our work, a number of pedagogical agents were employed in intelligent systems without systematic assessment of agent features on specific educational outcomes (Johnson et al. 2000; Lester et al. 1999; Moreno et al. 2001). The underlying assumption of these studies was that learners would perceive the agent features as intended by the designers. However, perceptions of realism or attractiveness, for example, differ even among learner groups depending on their ages (Krämer 2010), not to mention the differential expectations between adult designers and younger learners. Accordingly, the results of those studies presented mixed effects. A key contribution of our work is that agents can effectively simulate instructional roles when designed with the appropriate persona and associated media features.
Often, being intelligent was essential in the definition of pedagogical agents in the research pioneered by the AI community (Johnson et al. 2000). At that time, the implementation of intelligent agents was particularly challenging technologically and resource-intensive. The pre-scripted agents in our original study, however, effectively played their intended instructional roles without being particularly “intelligent.” Perhaps, agent intelligence was an advantageous but not necessary condition for achieving desired learning outcomes. This finding stimulated us and other researchers to further inquire into various factors of pedagogical-agent-based learning without the requirement of developing intelligent systems (Haake and Gulz 2009; Kim 2007; Rosenberg-Kima et al. 2008; Veletsianos et al. 2010).
Lastly, we intended to create the agents as whole beings that could approximate qualities of human instructors, as best as we could, within the limit of technologies at that time. We often observed that researchers and designers paid attention solely to media features of pedagogical agents (i.e., image, voice, animation, and non-verbal communication). They compared the impact of each feature, with the intent to single out the most effective media feature. Through our work, it was clear that the agents embodied with a role and persona successfully instilled a sense of human-like instructional presence and elicited social responses from college students, which may not be possible for a single media feature.
Since the publication of the original paper, researchers have increasingly implemented pedagogical agents with corresponding interest in how the agents can enact human-like roles within a learning system. Building upon this initial work, we found the split-persona effect, indicating that splitting agent functionality into two distinct agent roles (i.e., Expert and Motivator) is preferable to combining into one agent role (Mentor) (Baylor and Ebbers 2003). Students learned significantly more and had significantly greater motivation when working with the two agents as compared to working with the one mentor agent. It seemed that it was easier for students to figuratively compartmentalize the agent information when it was delivered by two distinct sources. In motivational design, this effect suggests that having an affective or motivational coach implemented as a distinct agent may be preferable to having its functionality rolled up into a more inclusive help or training agent (Baylor 2011).
In addition, without a priori assumptions about agent roles from the perspective of grounded theory (Patton 2002), we conducted in-depth interviews to further explore college students’ expectations of agent roles (Kim 2007). In this inquiry, we viewed learners as active meaning-makers of their environments, bringing their own perspectives and expectations to the learning contexts and, perhaps, developing social bonds with the agent that matched their expectations. The results showed that the most salient qualities that students desired were the roles of teaching (knowledgeable) and motivating (friendly and kind).
Next, given the effectiveness of the peer-like motivator, the use of a peer metaphor in agent design became popular, designing agents as learning companions or virtual peers. In subsequent research, we emphasized the motivating role of agent peers for students who were learning challenging topics (Kim and Baylor 2006; Kim et al. 2007a). One important development in the area of peer-like agents was the design of teachable agents and co-learner agents. Based on “learning by teaching,” in a teachable agent environment (Schwartz et al. 2007), learners taught their agents and mastered the topic while teaching. A teachable agent (or co-learner) asked challenging questions to promote students’ reflective thinking while learning (Pareto 2014). Empirical results supported the effectiveness of teachable agents on achieving deeper learning and transfer. More importantly, peer-like agents effectively served as coping models for females who learned STEM topics, helping enhance positive affect and motivation. (Kim and Baylor 2007; Kim and Lim 2013).
In addition, the media features we used to define the agent roles gained attention from the agent research community. When carefully coordinated, these features might increase an agent’s believability and naturalness. Several studies have investigated to what degree each of the media features could contribute to improved learning and motivation. For example, if the agent’s appearance and voice were perceived as likable, this positively contributed to motivation and transfer of learning (Domagk 2010; Mayer 2005). Some argued that agent voice was the most important feature in the effectiveness of agent (Atkinson et al. 2005; Bente et al. 2008); however, other research indicated that the visual presence of an agent was significantly better than voice alone (Rosenberg-Kima et al. 2007). Further, other research revealed that the agent’s nonverbal communication (deictic gestures and emotional expression) differentially influenced the learning of procedural knowledge as compared to attitudinal information (Baylor and Kim 2009). Overall, by carefully designing the agent’s appearance, voice, nonverbal communication, and messaging, the agent can differentially impact specific learning and motivational outcomes (see Baylor 2011).
Progress and Recommendations
Pedagogical agent research has made great progress, expanding its scope from the focus on agents’ provision of expert guidance to a broader interest in agents’ social and affective capabilities to support learners (Veletsianos and Russell 2014). Initially the focus was on building intelligent agent-based systems to guide the learning processes, with the expectation of some motivational benefit through visual presence. Over the last ten years, the research community has grown, including involvement by researchers from diverse disciplines, such as instructional design, educational technology and psychology, human computer interaction, media communication, and social psychology. The research issues have expanded, particularly including interest in the social and relational aspect of agent-learner interactions. An agent who presented polite feedback increased the learning outcomes of college students more than an agent who presented direct feedback (Wang et al. 2008). Female students chose as their learning companion an agent that focused on developing social relationship during the learning task over an agent that was strictly task-oriented (Haake and Gulz 2009). Also, attribute similarities in human relations were consistently applied to agent/learner relations. High school students chose to work with a peer-like agent over a teacher-like agent (Kim et al. 2007b) and also preferred to work with an agent with the same ethnicity more than with a different one (Kim and Wei 2011; Moreno and Flowerday 2006; Plant et al. 2009). Female students chose “cool” and younger agents as their ideal social model agents; however, agents with expertise (although older and uncool) were as effective as the young and cool agents (Rosenberg-Kima et al. 2008). Collectively, we observed more empirical evidence that embodied pedagogical agents acted socially. Learners treated their agent in a social way as if the agent were a real human, expecting it to be pleasant and also feeling hurt by its criticism. Apparently, this illusion was attributable not to an agent’s intelligent behaviors but more to our routine habit of treating media socially (Reeves and Nass 1996) and also to our natural tendency to animate or anthropomorphize artifacts (Norman 1997; Stern 2002).
With the growing understanding of the integral relationship between emotions and cognition, some researchers have been striving to provide a supportive environment by equipping tutoring systems with affective capabilities (Boulay et al. 2010; Graesser et al. 2008). Similarly, much work was been done in the area of investigating emotional interactions between an agent and a learner. An agent’s empathetic responses to the learner’s emotional states while learning had a positive influence on learner self-efficacy in the task and positive attitudes whereas an agent’s happy smiles per se did not have such influence (Kim et al. 2007a). The AutoTutor group equipped the tutor with affect sensing capabilities and has been continuously refining a model of learner affective states while learning complex skills (D’Mello et al. 2006; D’Mello and Graesser 2012).
The examination of agent impact in terms of learner characteristics is also noteworthy. We found, in general, that females across age groups were more in favor of agent-based interactive learning environments than males (Arroyo et al. 2003, 2013; Kim and Baylor 2006; Kim et al. 2007a). College-aged students of color were more positive to a similar agent than to a dissimilar agent (Moreno and Flowerday 2006). Middle grade females and ethnic minorities expressed their comfort in learning from an agent, improved their self-efficacy in learning algebraic concepts and positive attitudes, and increased learning significantly after working with the agent, compared to white males (Kim and Lim 2013). The positive impact of the agent on those students was largely attributable to their occasional marginalized learning experiences in everyday classrooms. Lastly, a meta-analysis reported agent presence seemed to have a more positive influence on K-12 students than on college-level students (Schroeder et al. 2013).
Over the last decade, agent design tools and AI technologies have significantly advanced. The technologies for designing media features and emotional interactions enable designers and researchers to create more believable agents. Natural language processing coupled with speech recognition technology allows for a more natural tutorial dialogue between learner and agent and better simulates human-to-human conversations—for example, refer to the virtual humans developed by the Institute for Creative Technologies (http://ict.usc.edu) and Project Listen (http://www.projectlisten.org). The instructional and motivational messages that were pre-scripted and controlled in our study now can be more easily adapted to students’ instructional needs in real-time. Along this line, revisiting our study with agents that have more natural and interactive speech is warranted. Such research could take into account the needs of the learners, particularly with diverse student populations who might have unique challenges in motivation and learning.
We expect that designing the optimal instructional role for artificial beings will continue to be of interest in the AI research community and more broadly the educational technology community as well. As multi-agent systems are implemented more easily, the definition of agent roles has become fine-tuned. Agents have taken on a range of roles, from proactively teaching and guiding, through collaborating and co-learning, to even existing subtly in the background (e.g., in multi-agent educational games and combat training simulations). Also, with the advances in online technology, learning platforms have become increasingly personalized, and a growing number of people choose online learning over classrooms. The personalized service provided by pedagogical agents might enrich these learning experiences both socially and cognitively. Lastly, pedagogical agents have taken the form of on-screen characters in many recent studies. It is very plausible that the agents will expand in their representations, such as humanoid robots (Fridin 2014; Kim et al. 2014) or holographic figures as these technologies evolve in the future. The interaction dynamics between the learner and each of these technologies will need to be explored. It is important to continue to expand our understanding of the roles and functionalities of pedagogical agents as well as other technology-based instructional personas. This freedom to create idealized artificial instructors is a freedom not possible with human instructors. Research-informed design provides exciting possibilities for developing virtual instructors that are increasingly more personalized and effective.
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