An ERD mapping study of the neurocognitive processes involved in the perceptual and semantic analysis of environmental sounds and words
| Autor: | Jean-Claude Baron, Francis Eustache, J Lambert, Nathalie Lebrun, P. Etevenon, Patrice Clochon |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Adult
Cognitive Neuroscience Semantic analysis (machine learning) media_common.quotation_subject Experimental and Cognitive Psychology Environment Electroencephalography Semantics Behavioral Neuroscience Nonverbal communication Cognition Mental Processes Reference Values Perception Reaction Time medicine Humans Semantic memory Cortical Synchronization media_common Brain Mapping medicine.diagnostic_test Brain Sound Laterality Auditory Perception Speech Perception Female Psychology Cognitive psychology |
| Zdroj: | Cognitive Brain Research. 11:235-248 |
| ISSN: | 0926-6410 |
| DOI: | 10.1016/s0926-6410(00)00078-1 |
| Popis: | The aim of this paper was to investigate and compare the EEG mechanisms underlying the perceptual and semantic processes involved in environmental and language sounds perception by manipulating the degree of identification of sounds and using the ERD (event-related desynchronization) method in healthy subjects. Four types of stimuli were analyzed: meaningful environmental sounds, meaningless sounds, words and non-words. We report many similarities in the ERDs and ERSs (event-related synchronizations) patterns among all stimuli, with: (i) similar time-course of ERDs and ERSs between meaningful environmental sounds and words, and between meaningless sounds and non-words; (ii) similar topography of the maximal ERDs for meaningful environmental sounds, words and non-words; and (iii) same right posterior ERSs for all four stimuli. However, differences were also observed: (i) in time-course, with earlier ERSs for meaningless than meaningful stimuli, whether environmental or verbal; and (ii) in topography, with ERDs predominating in left and right hemisphere channels for meaningful and meaningless environmental sounds, respectively; (iii) ERSs predominating in the left temporal channel for non-words and in the left posterior and right frontal channels for meaningless sounds. The results of this study suggest that meaningful stimuli involve greater and longer-lasting semantic processes than meaningless stimuli, while the occurrence of ERSs for the latter points to the possible involvement of an inhibitory processing of semantic representations. Finally, the findings concerning the comparison between verbal and non verbal stimuli suggest the involvement of left-lateralized phonological and semantic processes for the former, and more distributed neurocognitive processes in both hemispheres for the latter although with predominant left laterality for their semantic processing. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect