Fig. 3

Cerebral activity in fNIRS recordings during the verbal fluency test. Coloured circles present the results of DAP corrected t-tests comparing the beta weights between two conditions for each of the three study groups during the verbal fluency test (VFT); left side r₅₉ = 0.467, critical t-value (two-sided) = 2.66, α = 0.01; right side r₅₉ = 0.48, critical t-value (two-sided) = 2.64, α = 0.01). Each circle shows the t-value of the comparison in each channel (indicated by the colour bar, where dark red represents the largest t-value [+8] and dark blue the smallest t-value [0]). Data from the contralateral hemisphere are presented in the left column while those from the ipsilateral hemisphere are presented in the right column. Patients with FMS did not differ in cerebral activation, while patients with depression showed a reduction of frontal cerebral activation