Electrophysiology of spoken phrase production: Exploring effects of complexity and switching on the P300
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Issue Date
2015-08-01
Language
en
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Abstract
P300
is
one
of
the
most
studied
event-‐related
brain
potentials
(ERPs)
in
cognitive
neuroscience
related
to
attention
and
memory.
However,
little
is
known
about
P300
modulations
in
spoken
language
production.
Previous
research
outside
the
language
domain
has
shown
that
P300
amplitude
is
sensitive
to
task
complexity
and
switching.
The
current
study
examined
the
influence
of
these
two
factors
on
P300
amplitude
in
phrase
production
through
a
within-‐
language
switching
paradigm
using
differential
noun
phrase
length.
Participants
switched
every
second
trial
between
describing
pictures
with
one
adjective
(size
only;
short
condition)
or
two
adjectives
(size
and
colour;
long
condition)
in
the
format
determiner
+
adjective(s)
+
noun.
Response
times
(RTs)
were
longer
for
long-‐
than
short-‐phrase
trials
(length
effect).
Moreover,
length
and
sequence
interacted:
RTs
were
longer
on
switch
than
on
repeat
trials
for
the
short
phrases
(switch
cost)
but
shorter
on
switch
than
on
repeat
trials
for
the
long
phrases
(switch
benefit).
This
caused
the
length
effect
to
be
smaller
on
switch
than
on
repeat
trials.
The
ERPs
showed
an
effect
of
length
but
not
of
sequence,
as
well
as
no
interaction.
The
P300
amplitude
was
greater
on
long
trials
than
on
short
trials.
Thus,
whereas
RTs
reflected
both
length
and
an
interaction
between
length
and
sequence
effects,
P300
amplitude
reflected
only
length.
These
results
suggest
that
P300
in
language
production
is
sensitive
to
task
complexity
but
not
to
switching,
unlike
what
is
found
outside
the
language
domain.
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Faculteit der Sociale Wetenschappen