Auditory semantic networks for words and natural sounds.

Auditory semantic networks for words and natural sounds. Research Abstract Details 

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Auditory semantic networks for words and natural sounds. Abstract Text:

A Cummings,R Ceponiene,A Koyama,A P Saygin,J Townsend,F Dick,

Does lexical processing rely on a specialized semantic network in the brain, or does it draw on more general semantic resources? The primary goal of this study was to compare behavioral and electrophysiological responses evoked during the processing of words, environmental sounds, and non-meaningful sounds in semantically matching or mismatching visual contexts. A secondary goal was to characterize the dynamic relationship between the behavioral and neural activities related to semantic integration using a novel analysis technique, ERP imaging. In matching trials, meaningful-sound ERPs were characterized by an extended positivity (200-600 ms) that in mismatching trials partly overlapped with centro-parietal N400 and frontal N600 negativities. The mismatch word-N400 peaked later than the environmental sound-N400 and was only slightly more posterior in scalp distribution. Single-trial ERP imaging revealed that for meaningful stimuli, the match-positivity consisted of a sensory P2 (200 ms), a semantic positivity (PS, 300 ms), and a parietal response-related positivity (PR, 500-800 ms). The magnitudes (but not the timing) of the N400 and PS activities correlated with subjects' reaction times, whereas both the latency and magnitude of the PR was correlated with subjects' reaction times. These results suggest that largely overlapping neural networks process verbal and non-verbal semantic information. In addition, it appears that semantic integration operates across different time scales: earlier processes (indexed by the PS and N400) utilize the established meaningful, but not necessarily lexical, semantic representations, whereas later processes (indexed by the PR and N600) are involved in the explicit interpretation of stimulus semantics and possibly of the required response.

Auditory semantic networks for words and natural sounds. Publishing Authors By Initials

A Cummings,R Ceponiene,A Koyama,AP Saygin,J Townsend,F Dick,

For similar natural sciences: time: time factors research abstracts see: natural sciences: time: time factors research

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Auditory semantic networks for words and natural sounds. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Brain research

VOLUME: 1115

Page Numbers: 92-107

Journal Abbreviation: Brain Res.

ISSN: 0006-8993

DAY: 8

MONTH: 09

YEAR: 2006

Auditory semantic networks for words and natural sounds. Information

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LANGUAGE: eng

NlmUniqueID: 45503

Auditory semantic networks for words and natural sounds. Keywords Mesh Terms:

KEYWORDS: Time Factors

MESH TERMS: physiology

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Grant and Affiliation Information for Auditory semantic networks for words and natural sounds.

AFFILIATION: Project in Cognitive and Neural Development, University of California, San Diego, USA. acummings@crl.ucSD.edu <acummings@crl.ucSD.edu>

Country: Netherlands

AGENCY: United States NIDCD

GRANT: DC007361

ACRONYM: DC

MEDLINETA: Brain Res

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