Figure 1
From: Optical and electrical recording of neural activity evoked by graded contrast visual stimulus
System design: (a) the optical unit is the NIMO CW-NIRS oxymeter, (b) the electrical unit includes the custom built analog amplifier and filter and the A/D converter, (c) visual stimulation and electro-optical recording interface is provided by an LCD projector, projection screen, optical head (Figure 2) and EEG-cap (Figure 3), and (d) the control unit is a personal computer running the supervisor software. The optical and electrical units controlled by the personal computer are both used to monitor the visual cortex. The same personal computer is used to control the LCD projector which generates the visual stimuli.