ERP analysis |
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Opening data for analysis |
A 500 second continuous recording, with events shown in the top two channels. These events are used to extract blocks from the whole record that are synchronous with stimuli. |
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Multi-block raw data Review showing blocks 53,55, etc. excluded |
Screening data for ERP analysis |
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Blocks containing eye blinks are excluded from the average using menu selection Include, Screen blocks. |
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Bad blocks may be automatically excluded by selecting Review menu, Include, Screen blocks. Channels used in the screening process are selected by clicking the indicator number seen to the left of the axis of each trace in the Review. Frontal channels or eye channels, for example, may be used if these were included in the electrode array. In the example shown, all channels except the top two event channels are set to 1 (on), but the event channels must be switched off before screening is performed, as they do not contain EEG data and would cause every block to be |
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excluded. When channels are correctly set, automatic screening is then performed. Channel settings and screening parameter settings are stored in a template file so that processing of subsequent records may automatically use the same settings. |
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Averaging |
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Zoom in to raw data block 53, shown as excluded because of a blink. |
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The entire process of loading, screening, manipulating and extracting topical information may be automated using the Macro record and play features, so that multiple records may be processed leaving the computer unattended. |
Average of 28 included blocks. Micro Voltage levels for any chosen points in the wave may be seen in the Coordinates window. |
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