title: Neural correlates of spatial and nonspatial attention determined using intracranial electroencephalographic signals in humans.
abstract: Few studies have directly compared the neural correlates of spatial attention (i.e., attention to a particular location) and nonspatial attention (i.e., attention to a feature in the visual scene) using well-controlled tasks. Here, we investigated the neural correlates of spatial and nonspatial attention in humans using intracranial electroencephalography. The topography and number of electrodes showing significant event-related desynchronization (ERD) or event-related synchronization (ERS) in different frequency bands were studied in 13 epileptic patients. Performance was not significantly different between the two conditions. In both conditions, ERD in the low-frequency bands and ERS in the high-frequency bands were present bilaterally in the parietal cortex (prominently on the right hemisphere) and frontal regions. In addition to these common changes, spatial attention involved right-lateralized activity that was maximal in the right superior parietal lobule (SPL), whereas nonspatial attention involved wider brain networks including the bilateral parietal, frontal, and temporal regions, but still had maximal activity in the right parietal lobe. Within the parietal lobe, spatial attention involved ERD or ERS in the right SPL, whereas nonspatial attention involved ERD or ERS in the right inferior parietal lobule. These findings reveal that common as well as different brain networks are engaged in spatial and nonspatial attention. Hum Brain Mapp 37:3041-3054, 2016. © 2016 The Authors Human Brain Mapping Published by Wiley Periodicals, Inc.
authors.affiliation: Department of Neurology, University of Ulsan College of Medicine, Seoul, Korea.
authors.forename: Ga Young
authors.initials: GY
authors.lastname: Park
authors.affiliation: Department of Biomedical Engineering, Hanyang University, Seoul, Korea.
authors.forename: Taekyung
authors.initials: T
authors.lastname: Kim
authors.affiliation: Department of Biomedical Engineering, Hanyang University, Seoul, Korea.
authors.forename: Jinsick
authors.initials: J
authors.lastname: Park
authors.affiliation: Department of Neurology, University of Ulsan College of Medicine, Ulsan University Hospital, Ulsan, Korea.
authors.forename: Eun Mi
authors.initials: EM
authors.lastname: Lee
authors.affiliation: Department of Neurology, University of Ulsan College of Medicine, Seoul, Korea.
authors.forename: Han Uk
authors.initials: HU
authors.lastname: Ryu
authors.affiliation: Department of Biomedical Engineering, Hanyang University, Seoul, Korea.
authors.forename: Sun I
authors.initials: SI
authors.lastname: Kim
authors.affiliation: Department of Biomedical Engineering, Hanyang University, Seoul, Korea.
authors.forename: In Young
authors.initials: IY
authors.lastname: Kim
authors.affiliation: Department of Neurology, University of Ulsan College of Medicine, Seoul, Korea.
authors.forename: Joong Koo
authors.initials: JK
authors.lastname: Kang
authors.affiliation: Department of Biomedical Engineering, Hanyang University, Seoul, Korea.
authors.forename: Dong Pyo
authors.initials: DP
authors.lastname: Jang
authors.affiliation: Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom.
authors.forename: Masud
authors.initials: M
authors.lastname: Husain
mesh_terms: D000293:Adolescent; D000328:Adult; D001288:Attention / Q000502:physiology*; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D000069280:Electrocorticography; D005260:Female; D006801:Humans; D008297:Male; D055815:Young Adult
keywords: intracranial electroencephalography; nonspatial attention; parietal lobe; spatial attention; time-frequency analysis