Decrease of functional coupling between left and right auditory cortices during dichotic listening: an electroencephalography study.
Articolo
Data di Pubblicazione:
2005
Abstract:
The present study focused on functional coupling
between human bilateral auditory cortices and on possible influence
of right over left auditory cortex during dichotic listening
of complex non-verbal tones having near (competing) compared
with distant non-competing fundamental frequencies. It
was hypothesized that dichotic stimulation with competing
tones would induce a decline of functional coupling between
the two auditory cortices, as revealed by a decrease of electroencephalography
coherence and an increase of directed transfer
function from right (specialized for the present stimulus
material) to left auditory cortex. Electroencephalograph was
recorded from T3 and T4 scalp sites, overlying respectively left
and right auditory cortices, and from Cz scalp site (vertex) for
control purposes. Event-related coherence between T3 and T4
scalp sites was significantly lower for all electroencephalography
bands of interest during dichotic listening of competing
than non-competing tone pairs. This was a specific effect, since
event-related coherence did not differ in a monotic control condition.
Furthermore, event-related coherence between T3 and
Cz and between T4 and Cz scalp sites showed no significant
effects. Conversely, the directed transfer function results
showed negligible influence at group level of right over left
auditory cortex during dichotic listening. These results suggest
a decrease of functional coupling between bilateral auditory
cortices during competing dichotic stimuli as a possible neural
substrate for the lateralization of auditory stimuli during dichotic
listening.
Tipologia CRIS:
1.1 Articolo in rivista
Elenco autori:
Brancucci, Alfredo; Babiloni, C; Vecchio, F; Galderisi, S; Mucci, A; Tecchio, F; Romani, Gian Luca; Rossini, Pm
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