Biopsychology class MEG demonstration
Place and time: MEG lab in A2-008 at the 29th of November 2024, from 9:15 am to 10:40 am
Agenda 85min
Lab tour and general equipment presentation 10min
MEG overview
Explain the dewar, SQUIDs sensors, liquid Helium system
Explain the MSR (Magnetically Shielded Room)
Show the computers layout and the different capabilities of the lab (eyetracker, vpixx triggers, response box, audio stimulus)
Present what experiments we will run on this day and the outline of the demonstration
Prepare the participant for an MEG experiment 20min
Perform laser scan of headhape on the participant
Place participant in MSR, explain the headcoils placed on participant head
Perform auditory check for safety
SQUID sensors demonstration 5min
Show sensitivity to noise, rapid eyeblinks, teeth pressure, phone in airplane mode on and off
Show marker measurement and explain their importance for source localization
Show reference magnetometers and explain denoising for external noise
Two demonstrations: Resting state and Auditory vs Visual 20min
- Experiment 1: Resting state: Access link to code and description 5min
Two blocks: a block of 10min eyes open and a second block of 10min eyes closed
- Experiment 2: Auditory vs Visual vs Motor: Access link to code and description 15min
A random sequence of 150 trials with three types of stimulus (conditions): auditory 200 Hz stimulus, visual (white flash), motor (button press)
Show and discuss analysis results 20min
Recap SQUID sensor operation, forward and inverse models, source reconstruction algorithms
- Experiment 1 analysis: Resting state: Access link to Analysis Notebook
Show higher alpha power in eyes closed than in eyes open in the alpha band (8-12Hz)
Show that this difference is better seen in the occipital region
- Experiment 2 analysis: Auditory vs Visual vs Motor experiment: Access link to Analysis Notebook
Show auditory trials activating the auditory cortex
Show visual trials activating the visual cortex
Show motor trials activating the motor cortex