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Detection of spatial frequency in brain-damaged patients: influence of hemispheric asymmetries and hemineglect
Natanael A Dos Santos1, Suellen M Andrade, Bernardino Fernandez Calvo
1Laboratory of Perception, Neuroscience and Behavior, Department of Psychology, Federal University of Paraíba João Pessoa, Brazil.
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.
