title: Visual attention spreads broadly but selects information locally.
abstract: Visual attention spreads over a range around the focus as the spotlight metaphor describes. Spatial spread of attentional enhancement and local selection/inhibition are crucial factors determining the profile of the spatial attention. Enhancement and ignorance/suppression are opposite effects of attention, and appeared to be mutually exclusive. Yet, no unified view of the factors has been provided despite their necessity for understanding the functions of spatial attention. This report provides electroencephalographic and behavioral evidence for the attentional spread at an early stage and selection/inhibition at a later stage of visual processing. Steady state visual evoked potential showed broad spatial tuning whereas the P3 component of the event related potential showed local selection or inhibition of the adjacent areas. Based on these results, we propose a two-stage model of spatial attention with broad spread at an early stage and local selection at a later stage.
authors.affiliation: Research Institute of Electrical Communication, Tohoku University.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Shioiri
authors.affiliation: Research Institute of Electrical Communication, Tohoku University.
authors.forename: Hajime
authors.initials: H
authors.lastname: Honjyo
authors.affiliation: Research Institute of Electrical Communication, Tohoku University.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Kashiwase
authors.affiliation: Research Institute of Electrical Communication, Tohoku University.
authors.forename: Kazumichi
authors.initials: K
authors.lastname: Matsumiya
authors.affiliation: Research Institute of Electrical Communication, Tohoku University.
authors.forename: Ichiro
authors.initials: I
authors.lastname: Kuriki
mesh_terms: D000328:Adult; D001288:Attention / Q000502:physiology*; D001289:Attention Deficit Disorder with Hyperactivity / Q000503:physiopathology*; D001519:Behavior / Q000502:physiology*; D000066949:Biobehavioral Sciences; D004569:Electroencephalography; D005074:Evoked Potentials, Visual; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D013028:Space Perception / Q000502:physiology*; D014794:Visual Fields; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult