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Analysis

Amplitude Averaging


The last step in the data analysis process is to make a matrix of the average amplitudes. For each cell, the amplitudes for a time range and a set of channels are averaged. This matrix is exported from Matlab in a .txt format that can be imported into SPSS.


See an automation7 script for more info.


Example from the AA Dataset: For the N170 time window, a set of channels was averaged over the 150 to 200 ms time range.


N170 & EPN Channel Set:

{’94’, ’95’, ’96’, ‘105’, ‘106’, ‘107’, ‘115’, ‘116’, ‘117’, ‘124’, ‘125’, ‘138’, ‘150’, ‘151’, ‘159’, ‘160’, ‘161’, ‘162’, ‘169’, ‘170’, ‘171’, ‘178’, ‘179’}


LPP Channel Set:

{’85’, ’86’, ’95’, ‘122’, ‘104’, ‘120’, ‘112’, ‘121’, ‘132’, ‘133’, ‘143’, ‘103 94′, ’93’, ’84’, ’83’, ’82’, ’92’, ’91’, ‘102’, ‘101’, ‘111’, ‘118’, ‘119’, ‘131’, ‘130’, ‘141’, ‘142’, ‘152’, ‘110’, ‘151’}




Wavelet Analysis

Read the section on wavelets in the ERP Technique book.

Also, these articles are a helpful introduction to wavelets. They can be found on Mendeley in our EEG Analysis Group.

Wavelet analysis of neuroelectric waveforms: a conceptual tutorial. V J Samar, a Bopardikar, R Rao, K Swartz in Brain and language (1999)


FFT

Phase Coherence

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Average Waveforms

Here, we plot the waveform of the averaged data using EEGLAB. For example, we may want to plot the average waveform of the scene stimuli...

Video Tutorials
AcqKnowledge Tutorial - Part 2
06:48
AcqKnowledge Tutorial - Part 1
02:11
Meta-analysis in R - Plotting Data
07:47
Meta-analysis in R - Data Culmination
01:18
Meta-analysis in R - Filtering Data
01:04
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