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Module 1: EEGLAB Demonstrations

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EEGLAB Demonstrations - Lesson Summary

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An auditory evoked potential (AEP) is a scalp recorded potential following an acoustic or auditory stimulus. The early components of AEPs are generated in the primary auditory cortex.

The late positive component or late positive complex (LPC) is a positive-going event-related brain potential (ERP) component where the prominent peak obtained within the 100th millisecond of a recording will confirm that our auditory or visual cortex is functioning properly in the brain.

The MMN is the negative component of the waveform obtained by subtracting the event-related response the standard event from the response to the deviant event. It is a fronto-central negative potential with sources in the primary and non-primary cortex and typical latency of 150-300ms after the onset of the deviant stimulus.

The P300 is an ERP that gives a positive deflection at 300ms after the presentation of a target stimulus. It has two components.

• P3a, which originates from stimulus-driven frontal attention mechanisms during task processing.
• P3b, which originates from temporal-parietal activity associated with attention and appears related to subsequent memory processing.

Visual evoked potentials (VEP) are electric signals generated by the visual cortex in response to visual stimulation and may be elicited either by diffuse flash stimuli or stimuli consisting of reversal or shift of high-contrast patterns such as checkerboards and parallel bars.

Wavelets provide time and frequency analysis simultaneously and offer different approaches for data analysis with a number of properties and flexibility. It is intended to seek similarities and correlations of EEG signals.

EEGLAB is a MATLAB toolbox developed by the Swartz Center of Computational Neuroscience that use plugins to process EEG and ERP signals.

ERPLAB is a toolbox integrated into EEGLAB that is used to analyze ERPs. It is important for the user to copy ERPLAB into the ‘plugins’ folder of EEGLAB to synchronize ERPLAB with EEGLAB.

A procedure in which specific time windows are extracted from the continuous EEG signal in EEGLAB is known as epoching.

‘Bins’ are used in EEGLAB to Collect responses to different stimuli triggers.