title: Directionless vection: A new illusory self-motion perception.
abstract: We report a new visual illusion, "directionless vection." When expanding and contracting optic flows are simultaneously presented in the same depth plane, observers can perceive illusory self-motion (vection) without direction.
authors.affiliation: Faculty of Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan; e-mail: seno@design.kyushu-u.ac.jp.
authors.forename: Takeharu
authors.initials: T
authors.lastname: Seno
authors.forename: Yuki
authors.initials: Y
authors.lastname: Yamada
authors.forename: Stephen
authors.initials: S
authors.lastname: Palmisano
keywords: motion direction; vection; visual illusion