视听觉相互作用之时间要素

我做的课题属于对视听觉相互作用的时间要素的研究,在Spain看到了相同研究,用的是fMRI,贴到这里.
Neural correlates of audiovisual synchrony and asynchrony in the human brain


Toemme Noesselt
Institute of Cognitive Neuroscience, University College London, UK & Department of Neurology II, University of Magdeburg, Germany

Claus Tempelmann
Department of Neurology II, University of Magdeburg, Germany

Hans-Jochen Heinze
Department of Neurology II, University of Magdeburg, Germany

Jon Driver
Institute of Cognitive Neuroscience, University College London, UK

Full text: Not available
Last modified: November 30, 1999

Abstract
Surprisingly few studies have addressed effects of audiovisual synchrony or asynchrony in the human brain; and most of these have used speech stimuli so that phonological, lexical or semantic processes might contribute. Our fMRI study investigated which brain areas may be modulated by (a)synchrony between beeps and flashes. Subjects performed a simple monitoring task at central fixation, while task-irrelevant auditory, visual or audiovisual stimuli were presented at irregular rates (mean 4Hz) in the periphery. Increased BOLD responses for blocks with synchronous versus asynchronous audiovisual stimulation were observed in contralateral posterior superior temporal sulcus (STS) and inferior temporal gyrus (multisensory areas); plus in anterior fusiform and posterior parietal cortex (visual areas), and early auditory areas. The reverse (asynchrony>synchrony) was found in superior colliculi and prefrontal cortex (multisensory areas), plus in middle and superior occipital and posterior fusiform gyri (visual areas). These results identify a network of unimodal and multimodal cortical areas influenced by audiovisual synchrony or asynchrony. The STS showed a particularly revealing pattern, responding to unimodal auditory or visual stimulation, with an increase for synchronous audio-visual stimulation and a decrease for asynchronous (both relative to the two unimodal baselines), that was observed for 24/24 subjects.