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Cross GLM Studies - Coggle Diagram

- - - - Temporal resolution for signal acquisition was 27 Hz.
      - focused on deOxyHb
    - - hemodynamic modelling of the data served as a low-pass filter
    - - 14% of channels removed using this criterion
    - - before hemodynamic modelling of data
  - - - ⬆️ signal magnitude than deOxyHb
      - ⬆️ contaminated by systemic artifacts
    - - ⬆️ correlated with BOLD signal from fMRI
      - ⬆️ spatial specificity
  - - - Beta values obtained for each channel and reshaped into a 3-D volume image with 2×2×2 mm voxels that tiled the brain regions covered by the channels.
      - Task GLM
        
        6 categorical regressors (2 conditions x 3 phases)
        
        Private and Shared
        
        Question :arrow_right: Answer :arrow_right: Feedback
      - Task + Face GLM
        
        Task and 2 more parametric regressors
        
        observation of partner's facial display
        
        production of own facial displays
        
        Task + Face + Gaze GLM
        
        because observation might modulate brain activity when participant gazes at partner's face
        
        Observation regressor :arrow_right: data points at time participant not looking at partner set to 0
      - Tax + Face + Brain GLM
        
        Task + Face + 4 brain activity regressors
        
        right TPJ (shared & private)
        
        hypothesised to be responsible for social control networks
        
        left dlPFC (shared & private)
        
        hypothesised to be responsible for strategic control networks
        
        brain regressors generated by identifying unique regions of interest for each participant
        
        mean brain activity calculated across all channels if there were multiple channels in ROI
    - - FDR correction method (\(q=0.05\)) to correct for multiple comparisons
  - - - Feedback
        
        Shared
        
        participant choices disclosed
        
        heard recording saying ‘Same answers’ or ‘Different answers’
        
        Private
        
        participant choices not disclosed
        
        heard recording saying ‘Answers received'
      - question => recording of statement played for 3-5s
      - answer => participants indicate if statement was true or false for 3s
      - Rest => stare at fixation cross on left side of table for 10s
- - - - noisy channels show
        
        detector saturation
        
        ⬇️ optical coupling
        
        lack of :<3: frequency (~1Hz) in power spectrum
      - :two: Raw intensity converted to optical density changes
        
        :three: Wavelet-based method
        
        hmrInteensity2OD; iqr = 1.5
        
        :four: Band-pass filter
        
        slow trends
        
        remove physiological noise (heart rate & ⬇️ frequency noise)
        
        :five: Modified Beer-Lambert law
        
        :six: CBSI
        
        used to combine pre-processed HbO2 and HbR into single activation signal
        
        corrected motion artefacts