Figure 3.

Detection of BTCS. (a) shows 80 seconds of a BTCS in the time domain. Superpositioned on the EEG signal, the bold black line shows the root mean square (RMS) envelope, which increases during the tonic-clonic phase of the seizure. (b) shows the time-frequency decomposition from a continuous wavelet transform of the same seizure. During the tonic-clonic phase, a high-frequency component can be observed, approaching the Nyquist frequency of the device (103.5 Hz). (c) shows the RMS envelope of a six-hour epoch containing two BTCS indicated with red triangles. The RMS shows an abrupt increase only in close relation to these seizures, providing proof-of-concept that the device can be used for the detection of BTCS.