Technical Support Social & Behavioural Sciences (TOP)


Physiological research labs

All physiological labs are located on the first (US: second) floor of the building and can roughly be divided into two mainstream research areas: EEG and ‘other physiological’ research. The EEG labs mainly use Biosemi 64-channel EEG equipment, the other labs use the Vsrrp98 measurement system. The sleep lab uses two 64-channel ANT amplifiers that can be bridged into a 128-channel EEG amplifier.


The standard EEG labs use a Biosemi 64 channel amplifier and caps with active electrodes. 32 and 64 channel caps are available from TOP. The signal quality of the caps slowly deteriorates over time; usually after some 100 to 150 measurements a few channels in the cap start to clip, generating noise or float around, signaling the end of life is near. Gentle handling of the electrodes extends life expectancy. See our handling and cleaning instructions on page NNN. Apart from the 64 EEG channels the amplifier uses 8 unipolar inputs to measure EMG, EOG or ECG. Each bipolar measure requires two unipolar inputs, so a maximum of 4 bipolar channels can be used. Most Biosemi configurations also have one SCL and two auxiliary inputs available.
The EEG labs use two Windows 7 computers. The first is used as a data acquisition PC connected to the Biosemi amplifier through an optical wire interface. The second computer is a stimulus PC with E-Prime and Presentation installed. Inquisit and Direct-RT can be installed on request. TOP fully supports and encourages the use of Presentation. E-Prime, Inquisit and Direct-RT are supported on a best-as-we-can basis.
The stimulus computer is connected to the data acquisition computer through an eight bit parallel port allowing 255 different event codes to be sent to the EEG recording program.


19 March 2014