title: Spatially constrained locomotion under informational conflict.
abstract: This study investigates the informational based that supports intentional adaptation of locomotion to spatial environmental constraints. A virtual reality setup was used to present subjects with targets providing normal as well as abnormal optical expansion during locomotor pointing (i.e. positioning of a foot on a visible target on the floor during walking). The manipulation dissociated two variables providing temporal information about time-to-passage (TTP): TTP(beta alpha) which encompasses target expansion, and TTP(alpha) which is independent of target expansion. While a previous study showed TTP(alpha) to be sufficient, the present results reveal that TTP(beta alpha) may be used when it is available. This finding indicates that both variables play a role that varies according to the circumstances. Furthermore, the present results provide evidence of the operation of a security principle for action in conflicting situations.
authors.affiliation: UMR Mouvement et Perception, CNRS et Université de la Méditerranée, 163 Avenue de Luminy CP910, 13288 Marseille Cedex 9, France. de_rugy@laps.univ-mrs.fr
authors.forename: A
authors.initials: A
authors.lastname: de Rugy
authors.forename: G
authors.initials: G
authors.lastname: Montagne
authors.forename: M J
authors.initials: MJ
authors.lastname: Buekers
authors.forename: M
authors.initials: M
authors.lastname: Laurent
mesh_terms: D000223:Adaptation, Psychological / Q000502:physiology*; D003220:Conflict, Psychological; D004777:Environment; D005528:Foot / Q000502:physiology; D006801:Humans; D009043:Motor Activity / Q000502:physiology*; D013028:Space Perception / Q000502:physiology; D016138:Walking / Q000502:physiology