Cognitive Science 160
Brain
Computer Interface Systems
Summer
I 2003 Midterm
Practice
Questions
Note: The midterm will cover all material presented in lecture through Friday, July 18, as well as all readings through week 3.
Thus,
mental state BCIs and eye tracking/EMG BCIs will not be covered on the midterm.
Compared
to conventional interfaces, BCIs are slow and inaccurate. Why, then, would
anyone use a BCI? Provide at least
three
reasons.
What
was the purpose of the Suppes article in the week 1 reading? That is, what sort
of mental activity did the authors try to
detect?
Briefly
describe four different interfaces used in mu BCIs. You should discuss the
operating environment (what the user saw
on
the screen) as well as the possible outputs (what signals that the mu activity
was translated to).
The
BCI described in Sutter (1992) and Sutter and Tran (1992) utilized which of the
following?
A.
user
programmable interface
B.
dry
electrodes
C.
IR
(wireless) telemetry
D.
a
menu based system
E.
SSVER
activity
F.
P300s
G.
A
large vocabulary (relative to other BCIs)
Which
of the following EEG frequencies typically falls in the range of about 8-14 Hz?
A.
delta
B.
theta
C.
alpha
D.
mu
E.
beta
Wolpaw
et al. (2002) lists five components of all BCIs. Name them.
A
_____________ ________________ filter
would remove all EEG activity above a certain frequency.
Name
four factors that can affect the P300.
Below
are four different types of EEG activity used in BCIs. For each, state where on
the scalp this signal is typically maximum
(either with electrode site or a general
description of the brain area underneath it):
Mu
P300
SSVEP
SCP
_____________ _________________ is a pattern
classification approach used in Farwell and Donchin (1988). The computer
finds the most positive point in a certain
range, and categorizes the ERP as attended or ignored based on the amplitude
and
latency
of this point.
The
first study of Allison’s thesis compared the conventional single flash approach
to a new means of grouping flashed characters
called
the ______________ flash approach.
Three
different types of noise may contaminate EEG signals of interest in a BCI: EEG
noise, EXG noise,
and
_________________ noise.