To provide a brain activity prediction device, a perception recognition content estimation system, and a brain activity prediction method improved in convenience for deducing perception and recognition contents.SOLUTION: A brain activity prediction device 10 comprises: a stimulation feature matrix generation part 121 which generates a first feature vector where an expression to stimulation is projected to a first feature space and generates a first stimulation feature matrix in which the first feature vector is collected in time series; and a brain activity prediction part 124 which, by a regression model with set data of a stimulation feature matrix with respect to the stimulation for learning given to a subject and a brain activity matrix in which the brain activity vector generated on the basis of measurement data provided by measuring the brain activity with respect to the stimulation for the learning is collected in time series, as learning data, on the basis of an encoder learning result provided by learning a projection relation from the first feature space to the brain activity, predicts the brain activity matrix with respect to a new stimulation from the first stimulation feature matrix generated by the feature matrix generation part with respect to the new stimulation.SELECTED DRAWING: Figure 1
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