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This integration has been modeled in detail for the visual system ] and similar principles should also describe other sensory functions such as auditory speech perception and comprehension. These "long-range connections formed by excitatory cortical neurons" p.3] are considered the anatomical substrate of this integrative capability.
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In this process, changes in cortical networks are formed and modified by experience through the simultaneous excitation of groups of neurons. One key function of the cerebral cortex involves the integration of elements into a percept that separates them from the background. We conclude that coherent neuronal network activity may index encoding of verbal information on the sentence level and can be used as a tool to investigate auditory speech comprehension. Intra-hemispheric coherence was larger within the left than the right hemisphere for the sentence (condition (b) relative to all other conditions), and tended to be larger within the right than the left hemisphere for nonverbal stimuli (condition (c), tone and melody relative to the other conditions), leading to a more pronounced hemispheric asymmetry for nonverbal than verbal material. Coherence, defined as correlated activation of magnetic steady state fields across brain areas and measured as simultaneous activation of current dipoles in source space (Minimum-Norm-Estimates), increased within left- temporal-posterior areas when the sound string was perceived as a comprehensible sentence. Stimuli were presented to 12 subjects in the following conditions (a) an incomprehensible string of words, (b) the same string of words after being introduced as a comprehensible sentence by proper articulation, and (c) nonverbal stimulations that included a 600-Hz tone, a scale, and a melody. ResultsĪmplitude-modulated (sinusoidal 41.5 Hz) auditory verbal and nonverbal stimuli served to drive steady-state oscillations in neural networks involved in speech comprehension. You can also contact the journal’s editorial office using the contact details on the journal homepage (under 'About' in the top-menu).How does the brain convert sounds and phonemes into comprehensible speech? In the present magnetoencephalographic study we examined the hypothesis that the coherence of electromagnetic oscillatory activity within and across brain areas indicates neurophysiological processes linked to speech comprehension.
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If you are unsure whether or not you have an account, or have forgotten your password, follow the instructions on the log-in screen.If you’re a first time user, use the ‘Create An Account’ link to create an account On the journal’s homepage, click the ‘Submit an Article’ option on the right-hand side menu to open the ScholarOne Manuscripts homepage.Promotion Submitting with ScholarOne Manuscripts Getting started