Intentions could not be detected with high accuracy in the past. Intentions can be detected with high accuracy with a brain information output device that is equipped with a first brain activity data acquisition part, which acquires a first set of brain activity data for a user when said user indicates one intention, a second brain activity data acquisition part, which acquires a second set of brain activity data for the aforementioned user when said user indicates the aforementioned one intention, a first probability calculator, which calculates, from the aforementioned first set of brain activity data, a first probability that the aforementioned indicated one intention is an intention that corresponds to one of a multiplicity of intention identifiers, a second probability calculator, which calculates, from the aforementioned second set of brain activity data, a second probability that the aforementioned indicated one intention is an intention that corresponds to one of a multiplicity of intention identifiers, an intention determination part, which uses the aforementioned first probability and the aforementioned second probability to acquire an intention identifier, and an output unit, which outputs the aforementioned intention identifier.
BRAIN INFORMATION OUTPUT DEVICE, ROBOT, AND BRAIN INFORMATION OUTPUT METHOD