title: Detection of spatial frequency in brain-damaged patients: influence of hemispheric asymmetries and hemineglect.
abstract: Hemispheric specialization for spatial frequency processing was investigated by measuring the contrast sensitivity curves of sine-wave gratings in 30 left or right brain-damaged patients using different spatial frequencies compared with healthy participants. The results showed that left brain-damaged patients were selectively impaired in processing high frequencies, whereas right brain-damaged patients were more impaired in the processing low frequencies, regardless of the presence of visuo-spatial neglect. These visual processing results can be interpreted in terms of spatial frequency discrimination, with both hemispheres participating in this process in different ways.
authors.affiliation: Laboratory of Perception, Neuroscience and Behavior, Department of Psychology, Federal University of Paraíba João Pessoa, Brazil.
authors.forename: Natanael A
authors.initials: NA
authors.lastname: Dos Santos
authors.forename: Suellen M
authors.initials: SM
authors.lastname: Andrade
authors.forename: Bernardino
authors.initials: B
authors.lastname: Fernandez Calvo
keywords: contrast sensitivity; hemineglect; hemispheric specialization; spatial frequency; stroke