Fig. 1. Schematic of portable fNIRS-topography instrument

Fig. 2. Phantom used for system evaluation

Fig. 3. Experimental results of stability at different wavelengths. (a) 785 nm; (b) 830 nm

Fig. 4. Experimental results of linearity at different wavelengths. (a) 785 nm; (b) 830 nm

Fig. 5. Multi-channel crosstalk experiment. (a) Diagram of crosstalk channel; (b) evaluation of multi-channel crosstalk

Fig. 6. Channels of the paradigm experiment

Fig. 7. In-vivo experiment process

Fig. 8. In-vivo experiments by the breath-holding paradigm stimulation. (a) Spectrogram; (b) changes in hemoglobin concentration

Fig. 9. In-vivo experiments by mental arithmetic paradigm stimulation. (a) Spectrogram; (b) changes in hemoglobin concentration; (c) optical topography at rest; (b) optical topography at task