The invention discloses a method for estimating perceptual semantic content by analysis of brain activity. Provided is an
estimation method for measuring and analyzing brain activity to estimate a perceptual semantic content thereof. This method comprises: (1) inputting, to a
data processing means, an output when a cranial
nerve activity detection means detects an
annotation of a perceptual content and brain activity induced in a subject by a training stimulation; (2) associating a sematic space representation of the training stimulation and the output of the cranial
nerve activity detection means in a stored
semantic space and storing the association in a training result
information storage means; (3) inputting, to the
data processing means, an output when the cranial
nerve activity detection means detects brain activity induced by a novel stimulation, and obtaining a probability distribution in the
semantic space which represents perceptual semantic contents for the output of the novel stimulation-induced brain activity by the cranial nerve
activity detection means on the basis of the association; and (4) estimating a highly probable perceptual semantic content on the basis of the probability distribution. The association process may be performed for each subject. In the
probability estimation process, the likelihood calculated on the basis of the coordinate of a given word in the
semantic space and the probability distribution is used as an indicator.