著者

鈴本 直弥 浅井 暢子 寺本 渉

出版者

特定非営利活動法人 日本バーチャルリアリティ学会

雑誌

日本バーチャルリアリティ学会論文誌 (ISSN:1344011X)

巻号頁・発行日

vol.21, no.1, pp.53-62, 2016

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For users in a shared virtual environment (VE), a sense of being there together (copresence) is a key to behave as if they are in an actual environment. The present study investigated whether copresence can be measured using the social Simon effect (SSE) and event-related potentials (ERPs) associated with this effect. In the standard Simon effect, single participants press a left or right key in response to target color, while the target appeared on the left or right side of a monitor. Responses are generally faster when the target and key are located on the spatially-congruent side than on the incongruent side. This less happens when participants responds only to either color with either key. However, this effect reemerges when a participant responds to either color with either key, and their partner sat side by side responds to the other color with the other key. This is called SSE. We hypothesized that the SSE should occur if users experience copresence in the VE. Experiment 1 replicated the SSE in the actual environment. In Experiments 2 and 3, two participants in different rooms observed the same virtual environment with their partners' avatar through head-mounted displays, and performed the task. We compared between a group in which the participants interacted with their partner beforehand in the VE (high copresence group) and that in which they did not (low copresence group). The results showed that the stronger SSE occurred for the former group, suggesting that the SSE can be a measure for copresence in the VE.