Nuamps 40 channel dc amplifier

Presentation of stimuli and recording of behavioural responses were controlled by Stim2 (Version 4.0; Compumedics, Neuroscan, TX, USA). EEG data were recorded and processed using Scan 4.1 (Compumedics, Neuroscan, TX) software. A 40-channel Lycra EEG cap with embedded tin surface electrodes was used, following the international 10/20 system. The EEG was referenced to a point midway between Cz and Pz, with a ground electrode located midway between Fz and FPz. Impedances were below 10 kΩ for all electrodes at the start of the recording. Eye movements (EOG) were measured for subsequent EOG correction, with electrodes placed above and below the left eye, and on the outer canthus of each eye. EEG and EOG signals were amplified using a NuAmps 40-channel DC amplifier (Compumedics, Neuroscan, TX) with a digital bandpass filter at 0.15–100 Hz, and sampled at 1000 Hz.

Presentation of stimuli and recording of behavioral responses were controlled by Stim2 (Version 4.0; Compumedics, Neuroscan, TX). EEG data were recorded and processed using Scan 4.1 (Compumedics, Neuroscan, Charlotte, NC) software. A 40‐channel Lycra EEG cap with embedded tin surface electrodes was used, with 40 recording electrodes placed according to the international 10/20 system. The EEG was referenced to a point midway between Cz and Pz, with a ground electrode located midway between Fz and Pz. Impedances were below 10 kΩ for all electrodes at the start of the recording. Eye movements (EOG) were measured for subsequent EOG correction, with electrodes placed above and below the left eye, and on the outer canthus of each eye. EEG and EOG signals were amplified using a NuAmps 40‐channel DC amplifier (Compumedics, Neuroscan) with a digital bandpass filter at 0.15–100 Hz, and sampled at 1000 Hz. Data were stored offline for later processing.