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Context

The localizers are short cognitive tasks aimed at localizing some well known activities. The localizers and the anlyzing tools ahve been developed by Jean-Philippe Lachaux's team who nicely shared the code with us.

 

Start

The first localizers where done the 20/06/2018 with patient pat_02614_1073

tests

The stimuli are sent via "presentation" software.

Preprocessing

Rename .TRC file as

pat_ccccc_mmmm_filename_locaname.TRC

 

Create .pos, 3 column separated with tabs, and save it as

pat_ccccc_mmmm_filename_locaname_raw.pos

column 1 : sample

column 2 : TTL value

column 3 : 0

 

Depending on the acquisition settings, the analysis requiers different preprocessing steps.

Nlx2MM

This configuration is to be avoided.

TTL are sent to Neuralynx that send them to Micromed:

  • TTL numbers are all presents and with correct number
  • Timings of TTL on Neuralynx are good
  • Timings of TTL on Micromed have up to 200 ms delay

Solution: take timing from neurlaynx and find the time dely between Neuralynx and Micromed to transpose the correct TTL timings to Micromed

Neuralynx and Micromed in parallel

Trigger only via TTL

Trigger via TTL and bipolar voltage input

Micromed direct

Analyses

Launch.exe : F:\IR-IHU-ICM\Bureautique\EpiDBS\Epimicro\ExperimentProtocol\Localizer\DataLyon\Localizer - 21-02-2018\Localizer.exe

Load .TRC file: Fichier → Charger un fichier individuel

Select File and click on 'Convert to ELAN File

 

Run analysis

Generate Time Frequency Enveloppe

Select . eeg file: Fichier → Charger un fichier individuel

Check:

  • eeg file name
  • "Execute the same Analysis for each Frequency Band"
  • "Generate Time Frequency Envelloppe"

Click on "Process Analysis"

Select chanels to analyze in the popup window

 

Generate Maps and Plots

Select patient folder Fichier → Ouvrir dossier patient

Check:

  • frequency bands to analyze
  • Generate Maps (trialmat)
  • Generate Envellope Plots

Issues

  • If electrode has a number in the name, name cut at the first number: ex Ha2g1 will be Ha2
  • 2 "l" in Envelloppe"
  • 2 "l" ans 1 "p" in Envellope"

 

 

 

 

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