An information processing system includes: a first terminal that acquires a feature quantity of an echo sound reflected in a target's ear; a second terminal that enables a predetermined operation based on ear acoustic authentication using the feature quant...

A personal wearable EEG monitor with a base part (1) having signal processing means (23),an electrode part (2) with at least two electrodes (11, 12) for measuring an EEG signal of a person. The electrode part(2)comprises means for converting the EEG signal...