The EEG data was filtered at 70 Hz (low pass filter) and 0.3 KHz (high pass filter) using a Grass polygraph and continuously sampled by the data acquisition program (Icelus software, developed by Mark Opp, University of Michigan, Ann Arbor, MI) at sampling rate of 128 Hz.
First, EEG raw data was filtered at 70 Hz (low-pass), 0.5 Hz (high-pass) and 50 Hz (notch-filter, range 5 Hz).
Currents through the voltage-clamped bilayers (background conductance <3 pS) were filtered at the amplifier output (low pass, −3 dB at 10 kHz, 8-pole Bessel response).
Signals were filtered at 1 kHz with a low pass Bessel filter, and digitized at ≥20 kHz using 12-bit acquisition system Digidata 1332 (Axon Instruments, Union City, CA) and pClamp 9.0 software (Molecular Devices).
Signals were filtered at 6 kHz (4-pole low-pass Bessel filter) and digitized at 20 or 50 kHz using a CED 1401plus interface (Cambridge Electronic Design, UK).
Analogue signals were filtered at 1 kHz using a low-pass Bessel filter on an Axopatch 200B amplifier (Molecular Devices) in whole-cell mode and digitized at 10 kHz using a Digidata 1400A analogue-to-digital converter (Molecular Devices).
All signals were filtered at 2 kHz using a low-pass Bessel filter and digitized at 5 kHz using a MultiClamp 700A interface running pCLAMP software (Axon Instruments, Union City, CA, USA).
The amplified signals are filtered by the low pass filter at the input of data logger, which is 50 m away from the preamplifier.
Methanol soluble extracts were filtered and concentrated at low temperature and reduced pressure.
Data were filtered with a low-pass filter at 0.1 Hz to remove short-term motion artifacts.
