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OBJECTIVE: Electroencephalographic (EEG) waves modulated by context have been identified about 400 ms after presentation of a new semantic stimulus, such as a word or a number, within a prior context. However, it is not known if any component of these waves arises from a common brain system activated by different symbolic forms. METHODS: Multichannel EEG recordings were performed in 10 healthy subjects during the presentation of lexical and numerical series with congruent and incongruent endings. EEG was analysed using a combination of independent component and cluster analysis. RESULTS: Contextual integration of semantic stimuli elicited a negative independent component at around 400 ms that shared the same pattern of spatio-temporal covariation across numerical series and sentences within single subjects. This independent component was bigger following incongruent endings. CONCLUSIONS: These data provide evidence that one element of the activity contributing to the N400 is common to different symbolic forms. SIGNIFICANCE: One component of the brain systems evaluating the semantic inter-relationship of new stimuli with prior context may be common to different symbolic forms.

Original publication

DOI

10.1016/j.clinph.2004.01.010

Type

Journal article

Journal

Clin Neurophysiol

Publication Date

06/2004

Volume

115

Pages

1349 - 1358

Keywords

Acoustic Stimulation, Adult, Brain, Brain Mapping, Cluster Analysis, Electroencephalography, Evoked Potentials, Auditory, Female, Humans, Language, Male, Semantics