Inspired by the author
Cho-Hisamoto Y, Kojima K, Brown EC, Matsuzaki N, Asano E.
Cooing- and babbling-related gamma-oscillations during infancy:
intracranial recording. Epilepsy Behav. 2012 Apr;23(4):494-6.
Abstract
We determined the spatio-temporal dynamics of
intracranially-recorded gamma-oscillations modulated by spontaneous cooing and
babbling, which are considered to embody pre-linguistic language behaviors
during infancy. Electrocorticographic (ECoG) signals were recorded from 110
cortical sites in the right hemisphere of a 10-month-old girl with focal
epilepsy. Electrocorticographic signals were time-locked to the onset of cooing
or babbling. The amplitudes of gamma-oscillations during vocalizations were compared
to those during preceding silent reference periods. Cooing and babbling
elicited significant gamma-augmentation at 30-100 Hz at distinct sites of the
inferior Rolandic region, whereas both forms of vocalizations elicited
gamma-augmentation at an identical superior temporal site. The spatial,
temporal and spectral characteristics of gamma-augmentation elicited by cooing
and babbling were similar to those elicited by phoneme vocalization in older
children and adults. Differential activation within the right inferior Rolandic
region during cooing and babbling may reflect the mechanical or developmental
difference between these two forms of vocalizations. The right superior
temporal gyrus may participate in an auditory feedback system during
vocalization.
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