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Performance of a tactile P300 speller for healthy people and severely disabled patients.
[locked-in syndrome]
P
300
based
Brain
-
Computer
Interfaces
(
BCIs
)
for
communication
are
well
known
since
many
years
.
Most
of
them
use
visual
stimuli
to
elicit
evoked
potentials
because
it
is
easy
to
integrate
a
high
number
of
different
classes
into
the
paradigm
.
Nevertheless
,
a
BCI
that
depends
on
visual
stimuli
is
sometimes
not
feasible
due
to
the
presence
of
visual
impairment
in
patients
with
severe
brain
injuries
.
In
this
case
,
it
could
be
possible
to
use
auditory
or
somatosensory
stimulation
.
In
this
publication
a
vibrotactile
P
300
based
BCI
is
introduced
.
Two
different
approaches
were
tested
:
a
first
approach
using
two
stimulators
and
a
second
one
that
utilizes
three
stimulators
for
emitting
the
stimuli
.
The
two
paradigms
were
tested
on
16
users
:
A
group
of
ten
healthy
users
and
a
second
group
comprising
of
6
patients
suffering
Locked-
In
Syndrome
.
The
control
accuracy
was
calculated
for
both
groups
and
both
approaches
,
proving
the
feasibility
of
the
device
,
not
only
for
healthy
people
but
also
in
severely
disabled
patients
.
In
a
second
step
we
evaluated
the
influence
of
the
number
of
stimuli
on
the
accuracy
.
It
was
shown
that
in
many
cases
the
maximum
accuracy
was
already
reached
with
a
small
number
of
stimuli
,
this
could
be
used
in
future
tests
to
speed
up
the
Information
transfer
rate
.
Diseases
Validation
Diseases presenting
"small number"
symptom
adrenal incidentaloma
allergic bronchopulmonary aspergillosis
aromatase deficiency
cadasil
carcinoma of the gallbladder
cohen syndrome
cushing syndrome
dedifferentiated liposarcoma
dentinogenesis imperfecta
dracunculiasis
erdheim-chester disease
focal myositis
gm1 gangliosidosis
hodgkin lymphoma, classical
homocystinuria without methylmalonic aciduria
junctional epidermolysis bullosa
kabuki syndrome
kindler syndrome
lamellar ichthyosis
legionellosis
liposarcoma
locked-in syndrome
malignant atrophic papulosis
oculocutaneous albinism
oligodontia
omenn syndrome
pleomorphic liposarcoma
pyruvate dehydrogenase deficiency
severe combined immunodeficiency
thoracic outlet syndrome
triple a syndrome
waldenström macroglobulinemia
well-differentiated liposarcoma
wiskott-aldrich syndrome
wolf-hirschhorn syndrome
zellweger syndrome
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