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What is involved and what is necessary for complex linguistic and nonlinguistic auditory processing: evidence from functional magnetic resonance imaging and lesion data
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In: Journal of Cognitive Neuroscience , 19 (5) pp. 799-816. (2007) (2007)
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Auditory semantic networks for words and natural sounds
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Abstract:
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.
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Keyword:
Psychological Sciences
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URL: https://eprints.bbk.ac.uk/id/eprint/29985/
https://doi.org/10.1016/j.brainres.2006.07.050
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| 4 |
Auditory semantic networks for words and natural sounds.
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In: Brain Research , 1115 pp.92 - 107. (2006) (2006)
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An on-line task for contrasting auditory processing in the verbal and nonverbal domains and norms for younger and older adults
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Analyzing aphasia data in a multidimensional symptom space
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In: Brain and Language , 92 (2) pp.106 - 116. (2005) (2005)
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In search of Noun-Verb dissociations in aphasia across three processing tasks
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In: Center for Research in Language Newsletter , 17 (1) pp.3 - 17. (2005) (2005)
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Action comprehension in aphasia
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In: Neuropsychologia , 42 (13) pp.1788 - 1804. (2004) (2004)
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Neural resources for processing language and environmental sounds: evidence from aphasia
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The effects of linguistic mediation on the identification of environmental sounds
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| 12 |
Pragmatics in human-computer conversation
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In: Journal of Pragmatics , 34 (3 ) pp.227 - 258 . (2002) (2002)
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The effects of linguistic mediation on the identification of environmental sounds
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In: Center for Research in Language Newsletter , 14 (3 ) pp.3 - 9 . (2002) (2002)
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