Connectivity Measure

Summary

• Plugin name : Connectivity Measure
• Version : 1.0
• Author : Alison Cellard
• Company : Inria
• Short description : Measure connectivity between pairs of channel
• Documentation template generation date : Jul 24 2014
• WARNING : this box has been marked as UNSTABLE by the developer. It means that its implementation may be incomplete or that the box can only work under well known conditions. It may possibly crash or cause data loss. Use this box at your own risk, you've been warned.

Description

Measure connectivity between pairs of channel using the kind of measure chosen (PLV, MSC, etc.)

This box measure connectivity between pairs of channels using several method. For now, Single-Trial Phase Locking Value [1] is available.

[1] JP Lachaux, E Rodriguez, M Le Van Quyen, A Lutz, J Martinerie, FJ Varela, Studying single-trials of phase synchronous activity in the brain, International Journal of Bifurcation and Chaos in Applied Sciences and Engineering vol.10 p.2429-2440, 2000.

Inputs

1. EEG Signal

The input signal on which connectivity between channels needs to be measured.

• Type identifier : Signal (0x5ba36127, 0x195feae1)

Outputs

1. Connectivity measure

Connectivity measure between chosen channels

• Type identifier : Signal (0x5ba36127, 0x195feae1)

Settings

1. Method

Choice of the algorithm to measure connectivity (PLV, coherence, etc.)

• Type identifier : Connectivity measure method (0xdc90c94b, 0xf82ad423)

• Default value : [ Single-Trial Phase Locking Value ]

2. Pairs of channels

A semicolon separated list of pairs of channel identifiers. Channels within a pair must be separated by a hyphen. You can use the index of the channel or the name of the channel. Also, ranges can be selected specifying first channel identifier, followed by a colon, followed by the second channel identifier. To select all channels at once, use '*'.

• Type identifier : String (0x79a9edeb, 0x245d83fc)

• Default value : [ 1-2 ]

3. Channel Matching Method

The kind of identification for channel list.

• Smart let the box try to detect if the channel identifier is an index or a name
• Name forces the channel identifiers to be considered as channel names. This can be useful if channel names are numbers.
• Index forces the channel identifiers to be considered as channel indices. This can be useful if channel names are numbers.

• Type identifier : Match method (0x666f25e9, 0x3e5738d6)

• Default value : [ Smart ]

Examples

Miscellaneous

By default the box have one input for a signal set and you can measure connectivity between its channels. If you want to measure connectivity between two channels from two differents signals set, you can add an input. Please make sure the the two signal set have the same properties (same length, same sampling frequency). Also, note that in case of two input, the first channel of each pairs will be from the first input and the second channel from the second input.

Channel selection examples:

Single channel selection : 4-5 6-7, measure connectivity between channel 4 and 5 and between channel 6 and 7, if 2 inputs, this will measure connectivity between the 1st channel of input signal 1 and the 5th channel of input 2. Same goes for channel 6 and 7. Range selection : 1:4-5, measure connectivity between 4 pairs, equivalent to 1-5 2-5 3-5 4-5. All selection : 5-* measure connectivity between channel 5 and all the others or *-*, that form n*n pairs if one input signal with n channels or n*m pairs if two input signals with respectively n and m channels.