FILTERS ( EEG BOARDS)
EXAM WITH CORRECT
ANSWERS GRADED A+
name possible situations in which you may need to use a
low frequency filter (LFF) of 5Hz. correct answers >>
to emphasize fast components such as spikes or sleep
spindles by minimizing slow activity. in case of sweat
artifact which cannot be controlled by any other means,
the filter can minimize the baseline sway.
define filter correct answers >> used to exclude
waveforms that are out of range so that waveforms of
most importance can be recorded without distortion
name possible situations in which situation you may need
to use a low frequency filter of 0.3 or 0.1 Hz? correct
answers >> to emphasize low amplitude slowing; in
association with 15 mm/sec timebase; during an
electrocerebral inactivity (ECI) recording to make sure
there is no slow activity.
name possible situations in which you may need to use a
high frequency filter (HFF) of 35 or 15 Hz correct
GRADED A+
, answers >> excessive muscle artifact that cannot be
removed by any other means.
a high filter setting of 15 hertz will not show significant
information at:
a. 50 hertz
b. 15 hertz.
c. 10 hertz.
d. 5 hertz correct answers >> a. 50 hertz
the faster the frequency the more the 15 hertz filter will
attenuate the signal. viewing a frequency response curve
shows that a 15 hertz HFF will greatly attenuate a 50
hertz wave.
which of the following is most attenuated by time
constant of .01 sec.
a. 10 hertz
b. 0.5 hertz
c. 3 hertz
0.3 hertz correct answers >> d. 0.3
the slowest wave, 0.3 hertz, will be attenuated the most
which of the following is attenuated by a low pass filter of
15 hertz?
a. 1 hertz
GRADED A+
EXAM WITH CORRECT
ANSWERS GRADED A+
name possible situations in which you may need to use a
low frequency filter (LFF) of 5Hz. correct answers >>
to emphasize fast components such as spikes or sleep
spindles by minimizing slow activity. in case of sweat
artifact which cannot be controlled by any other means,
the filter can minimize the baseline sway.
define filter correct answers >> used to exclude
waveforms that are out of range so that waveforms of
most importance can be recorded without distortion
name possible situations in which situation you may need
to use a low frequency filter of 0.3 or 0.1 Hz? correct
answers >> to emphasize low amplitude slowing; in
association with 15 mm/sec timebase; during an
electrocerebral inactivity (ECI) recording to make sure
there is no slow activity.
name possible situations in which you may need to use a
high frequency filter (HFF) of 35 or 15 Hz correct
GRADED A+
, answers >> excessive muscle artifact that cannot be
removed by any other means.
a high filter setting of 15 hertz will not show significant
information at:
a. 50 hertz
b. 15 hertz.
c. 10 hertz.
d. 5 hertz correct answers >> a. 50 hertz
the faster the frequency the more the 15 hertz filter will
attenuate the signal. viewing a frequency response curve
shows that a 15 hertz HFF will greatly attenuate a 50
hertz wave.
which of the following is most attenuated by time
constant of .01 sec.
a. 10 hertz
b. 0.5 hertz
c. 3 hertz
0.3 hertz correct answers >> d. 0.3
the slowest wave, 0.3 hertz, will be attenuated the most
which of the following is attenuated by a low pass filter of
15 hertz?
a. 1 hertz
GRADED A+
