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An fNIRS-based binary communication paradigm is presented that requires limited preparation time and employs merely nine optodes on the left parietal-frontal hemisphere. Eighteen healthy participants performed two mental imagery tasks, mental drawing and spatial navigation, during auditorily cued time windows to answer yes/no questions. Participants’ answers were decoded in simulated real-time with a general linear model. A multi-trial group accuracy of 67% was reached using the oxygenated hemoglobin signal, whereas seven participants showed significant response in the deoxygenated hemoglobin signal. A simulated real-time multivariate approach was explored and showed discernibility of the two tasks, based on spatial patterns solely, in seven subjects. 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