Techniques for providing bio signal based mobile device applications are disclosed. In some embodiments, a system for bio signal based mobile device applications includes a bio signal sensor (e.g., biosensor) or multiple biosensors (e.g., multiple biosensors for EEG detection, or multiple biosensors that can each detect different types of bio signals), a bio signal processing unit, the mobile device, and a software application(s) that utilize the bio signal information for various applications (e.g., practical applications, entertainment applications, social networking applications, and/or other applications).
