Dynamics of the human brain network revealed by time-frequency effective connectivity in fNIRS

Grégoire Vergotte, Kjerstin Torre, Venkata Chaitanya Chirumamilla, Abdul Rauf Anwar, Sergiu Groppa, Stéphane Perrey, Muthuraman Muthuraman
2017 Biomedical Optics Express  
Functional near infrared spectroscopy (fNIRS) is a promising neuroimaging method for investigating networks of cortical regions over time. We propose a directed effective connectivity method (TPDC) allowing the capture of both time and frequency evolution of the brain's networks using fNIRS data acquired from healthy subjects performing a continuous finger-tapping task. Using this method we show the directed connectivity patterns among cortical motor regions involved in the task and their
more » ... icant variations in the strength of information flow exchanges. Intra and inter-hemispheric connections during the motor task with their temporal evolution are also provided. Characterisation of the fluctuations in brain connectivity opens up a new way to assess the organisation of the brain to adapt to changing task constraints, or under pathological conditions.
doi:10.1364/boe.8.005326 pmid:29188123 pmcid:PMC5695973 fatcat:vnzuvy2otjf3tfxs4x6kk33jhe