Newborns discriminate novel from harmonic sounds: a study using magnetoencephalography
Sambeth, A. and Huotilainen, M. and Kushnerenko, Elena and Fellman, V. and Pihko, E. (2006) Newborns discriminate novel from harmonic sounds: a study using magnetoencephalography. Clinical Neurophysiology 117 (3), pp. 496-503. ISSN 1388-2457.
Objective: We investigated whether newborns respond differently to novel and deviant sounds during quiet sleep. Methods: Twelve healthy neonates were presented with a three-stimulus oddball paradigm, consisting of frequent standard (76%), infrequent deviant (12%), and infrequent novel stimuli (12%). The standards and deviants were counterbalanced between the newborns and consisted of 500 and 750 Hz tones with two upper harmonics. The novel stimuli contained animal, human, and mechanical sounds. All stimuli had a duration of 300 ms and the stimulus onset asynchrony was 1 s. Evoked magnetic responses during quiet sleep were recorded and averaged offline. Results: Two deflections peaking at 345 and 615 ms after stimulus onset were observed in the evoked responses of most of the newborns. The first deflection was larger to novel and deviant stimuli than to the standard and, furthermore, larger to novel than to deviant stimuli. The second deflection was larger to novel and deviant stimuli than to standards, but did not differ between the novels and deviants. Conclusions: The two deflections found in the present study reflect different mechanisms of auditory change detection and discriminative processes. Significance: The early brain indicators of novelty detection may be crucial in assessing the normal and abnormal cortical function in newborns. Further, studying evoked magnetic fields to complex auditory stimulation in healthy newborns is needed for studying the newborns at-risk for cognitive or language problems.
|Additional Information:||Copyright © 2005 International Federation of Clinical Neurophysiology, published by Elsevier Ireland Ltd. Clinical Neurophysiology is the official journal of the International Federation of Clinical Neurophysiology, Italian Clinical Neurophysiology Society and The Japanese Society of Clinical Neurophysiology.|
|Keyword(s) / Subject(s):||auditory, change detection, magnetoencephalography, newborn, novelty oddball|
|School:||Birkbeck Schools and Departments > School of Science > Psychological Sciences|
|Depositing User:||Sandra Plummer|
|Date Deposited:||02 Aug 2007|
|Last Modified:||17 Apr 2013 12:33|
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