The Gaming Industry

Do Non-Player Characters Count as an “Audience”?
Nov 2016

Do Non-Player Characters Count as an “Audience”?

I’ve written before about the effects of having an audience when we play games. Research on having others watch you performing a task goes way back to the late 1800s when researchers timed how quickly children would reel fishing poles in when there were other kids doing it nearby. Similar results were found for cyclists pedaling alone or alongside others.1 There’s too much research on this topic to get into here, but the short version of one widely cited theory is that when you think you have an audience you use mental resources thinking about them and how they may be reacting to what you’re doing.2

If you’re doing something easy, this isn’t a problem. You’ve probably got mental resources to spare. And having an audience will probably motivate you to try harder on the task and thus perform better. But if you’re doing something difficult and novel, that takes more mental juice that you may not have to spare for thinking about an audience. As a result, having an audience for difficult tasks hurts performance. Taken as a whole, this is often called “The audience effect.”

But a paper that I recently saw presented at the 2016 CHI Play conference put an interesting spin on this: do NPCs in a game ever count as an audience? Do we think of them in that way enough to trigger the audience effect?

There’s actually some precedence to think so. In one 2008 study3 researchers actually found that that little obnoxious paperclip helper Clippy from Microsoft Word could be seen as judgy and condescending enough to impede performance on difficult typing tasks.

The CHIPlay paper by Katharina Emmerich and Maic Mauch is entitled The Influence of Virtual Agents on Player Experience and Performance4, 5 In it, the researchers created a simple game where you pilot a spaceship through an asteroid field, avoiding or blasting obstacles and scooping up items. Because they wanted to test the effects of spatial presence (that is, the feeling that you are in fact “there” in the game world) on the audience effect, they had both a virtual reality version of the game played with an Occulus Rift headset and a less fancy version played on a monitor.

Screenshot of the game used in the study.

Screenshot of the game used in the study.

To test whether an NPC could trigger the audience effect, the researchers created a cutesy little robot character that would either be present or not on the heads-up display, depending on what experimental condition a given player was in. So for those of you into experimental design jargon, they had a 2 (VR or non-VR) by 2 (NPC audience or no NPC audience) design. They then looked at players’ game score under various conditions.

What they found was that under conditions of high spatial presence and immersion (i.e., when playing with the virtual reality version of the game) players did worse. “Performance was significantly worse if the agent was present,” they write, “indicating an inhibition effect.”6

The robot NPC agent. Let's call him "Dieter." Why not?

The robot NPC agent. Let’s call him “Dieter.” Why not?

In a lot of ways this was a preliminary study.7 But it raises some interesting questions that can be addressed by more research. Do people attend to the NPC more when playing in virtual reality because they are more immersed and feel more spatial presence? Does dealing with all that VR tax their mental reserves such that a significant bite is taken out of the remainder by the otherwise innocuous little robot friend? In a way, this study could be interpreted as supporting the idea of the audience effect as described in other studies.

I’m also curious about if the effect would be stronger if the NPC were something more than a rather a mostly passive little robot sitting in the periphery of the screen. What if it said stuff about your performance? What if it cheered or sighed in exasperation while you played? What if the NPC were someone that the game had cemented as more important to the narrative and with whom you had formed some kind of affinity or at least familiarity? Would that exacerbate the NPC audience effect even more? Science should find out. Get at it, science.

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