title: Size of the attentional focus and efficiency of processing.
abstract: By following Eriksen and St. James (1986) the experiments reported in this study focused upon three questions: (a) Can the spatial extent of the attentional focus be made to vary in response to precues? (b) As the area of the attentional focus increases, is there a decrease in processing efficiency for stimuli within the focus? (c) Is the boundary of the focus sharply demarked from the residual field or does it show a gradual dropoff? The results seem to provide answers to these questions: (a) the size of the attentional focus can be adjusted so that it covers areas of the visual field of different size; (b) there is a decrease in processing efficiency when the area of the attentional focus increases; and (c) there is a gradual dropoff in processing efficiency around the attentional focus.
authors.affiliation: Università di Parma, Italy.
authors.forename: U
authors.initials: U
authors.lastname: Castiello
authors.forename: C
authors.initials: C
authors.lastname: Umiltà
mesh_terms: D000328:Adult; D001288:Attention; D005260:Female; D005403:Fixation, Ocular; D005556:Form Perception; D006801:Humans; D008297:Male; D009949:Orientation; D010364:Pattern Recognition, Visual; D011597:Psychomotor Performance; D011930:Reaction Time; D014794:Visual Fields