EEG Evoked Potentials in Humans |
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Several types of EEG evoked potentials can be easily recorded
using the PowerLab system and LabChart software.
Students can use PowerLab data acquisition systems to record brain activity (EEG) in response to external stimuli (such as flashes of light or sounds). These evoked EEG potentials are "time-locked" as they occur at specific latencies from presentation of the stimulus. As the changes in EEG signal are very small, Scope Software (which operates like a two channel oscilloscope) is ideal for signal averaging to extract the evoked response from background noise.
Examples of event-related EEG potentials that can be recorded with PowerLab include: Human EEG may be recorded using the EEG Electro-Cap System and the Bio Amp or Dual Bio Amp. Powerlab data acquisition systems have an analog output for connection to external stimulators that may present auditory or visual cues. The Advanced Teaching System provides a selection of equipment suitable for studying these event-related potentials.
- Brainstem auditory evoked potentials
- Somatosensory evoked potentials
- Visual evoked potentials
LabChart and Scope software enable students to generate stimuli of differing intensities and waveform structures (i.e. single-pulse, multiple pulse, simple ramps). The Evoked Response extension (Macintosh only) allows the extraction of analysis parameters such as value, onset latency and slope of the curve. |