Event-related potentials reveal dissociable mechanisms for orienting and focusing visuospatial attention
نویسندگان
چکیده
منابع مشابه
Event-related potentials reveal dissociable mechanisms for orienting and focusing visuospatial attention.
The neural mechanisms supporting visuospatial orienting and focusing were investigated by recording event-related potentials (ERPs) in a cued, line-orientation discrimination task. Search arrays flashed randomly in the left or right visual field and were preceded by peripheral cues that varied in validity (valid or invalid, with 50% each) and size (large or small, with 50% each). Facilitation o...
متن کاملMechanisms of Visuospatial Attention: Evidence from Event-related Brain Potentials
A series of experiments are reviewed that studied mechanisms underlying visuospatial attention by measuring the influence of attentional selectivity on event-related brain potentials (ERPs). The results are interpreted within a theoretical frameworkdeveloped by LaBerge(1995) and LaBerge andBrown(1989). Spatial attention can have an effect on occipital P1 and N1 components in trial-by-trial cuei...
متن کاملCerebral correlates of alerting, orienting and reorienting of visuospatial attention: an event-related fMRI study.
The identification of brain systems contributing to different aspects of visuospatial attention is of both clinical and theoretical interest. Cued target detection tasks provide a simple means to dissociate attentional subcomponents, such as alerting, orienting or reorienting of attention. Event-related functional magnetic resonance imaging (fMRI) was used to study neural correlates of these di...
متن کاملMechanisms of human attention: event-related potentials and oscillations.
Electrophysiological and hemodynamical responses of the brain allow investigation of the neural origins of human attention. We review attention-related brain responses from auditory and visual tasks employing oddball and novelty paradigms. Dipole localization and intracranial recordings as well as functional magnetic resonance imaging reveal multiple areas involved in generating and modulating ...
متن کاملThe orienting of visuospatial attention: an event-related brain potential study.
This study investigated the electrophysiological correlates of shifting, maintaining, and relaxing the focus of attention, using a symbolic cuing task. Cues and imperative stimuli were presented in rapid succession, and the ADJAR procedure was used to remove the contribution of event-related potential (ERP) activity associated with the imperative stimulus from the cue-related ERP waveforms. Ini...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Cognitive Brain Research
سال: 2005
ISSN: 0926-6410
DOI: 10.1016/j.cogbrainres.2004.11.014