216
Biomedical Signal and Image Processing
The file contains a 1 min episode-free segment followed by the epileptic
attack.* The total file duration spans 3 min with post-seizure activity. The sampling rate is 102.4 Hz.
a. Detect the spike-and-sharp-wave complexes with wavelet analysis and
determine the duration of these events.
b. V erify that these assaults fall in the grand mal category since the duration
is longer than a few seconds.
c. Locate the post-seizure activity, and determine the dominant frequency(ies)
in the spectrum of the epileptic attack and the post-seizure epochs.
10.5 Import the data in file “p_10_5.xls.” Each event spans 512 data points (256
prestimulation and 256 poststimulation) stored with a sampling frequency of
250 Hz. This file represents 16 trials of VEP. † All 16 trials are stored consecutively in a single column.
a. Plot the EEGs of 16 visual stimuli in 16 different graphs.
b. Identify the start of the VEP.
c. Determine the duration of each of the 16 events.
* These data were supplied by Rodri Quian Quiroga of The University of Leicester, Great Britain while
at California Institute of Technology in Pasadena California.
† The data were acquired by Martin Schuermann at California Institute of Technology.
Biomedical Signal and Image Processing
The file contains a 1 min episode-free segment followed by the epileptic
attack.* The total file duration spans 3 min with post-seizure activity. The sampling rate is 102.4 Hz.
a. Detect the spike-and-sharp-wave complexes with wavelet analysis and
determine the duration of these events.
b. V erify that these assaults fall in the grand mal category since the duration
is longer than a few seconds.
c. Locate the post-seizure activity, and determine the dominant frequency(ies)
in the spectrum of the epileptic attack and the post-seizure epochs.
10.5 Import the data in file “p_10_5.xls.” Each event spans 512 data points (256
prestimulation and 256 poststimulation) stored with a sampling frequency of
250 Hz. This file represents 16 trials of VEP. † All 16 trials are stored consecutively in a single column.
a. Plot the EEGs of 16 visual stimuli in 16 different graphs.
b. Identify the start of the VEP.
c. Determine the duration of each of the 16 events.
* These data were supplied by Rodri Quian Quiroga of The University of Leicester, Great Britain while
at California Institute of Technology in Pasadena California.
† The data were acquired by Martin Schuermann at California Institute of Technology.